diff --git a/.gitignore b/.gitignore
index 358ef59..c641b88 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,3 +15,6 @@
 # Generated by `npm run build:docs` — regenerated on every full build
 # (prebuild) and on demand during dev. Don't commit the artifact.
 /public/docs-index.json
+
+# impeccable tooling scratch (critique snapshots, live-server state)
+.impeccable/
diff --git a/CLAUDE.md b/CLAUDE.md
index 87d12bc..2eb3766 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -7,9 +7,9 @@ This file is a quick map, not a duplication of upstream docs.
 
 ## What Arcadia Admin is
 
-- **Arcadia Admin** is the operator/admin UI for [arcadia-core](../reference/arcadia-app), a multi-tenant Phoenix backend. Surfaces tenant management, user/role admin, billing, audit logs, storage configs, scheduled tasks, feature flags, and platform monitoring on top of arcadia's `/api/v1` and `/admin/*` endpoints.
+- **Arcadia Admin** is the operator/admin UI for [arcadia-core](../reference/arcadia-core), a multi-tenant Phoenix backend. Surfaces tenant management, user/role admin, billing, audit logs, storage configs, scheduled tasks, feature flags, and platform monitoring on top of arcadia's `/api/v1` and `/admin/*` endpoints.
 - **Cloned from** [Vibespace](../vibespace) — the starter for webapps in this style. Vibespace and Skyrise are the upstream sources of truth for the shell and the theme; don't backport arcadia-admin-specific changes into Vibespace unless they're broadly applicable.
-- **Backend reference** lives at `../reference/arcadia-app/`. Treat it as read-only documentation — it's the Phoenix umbrella app that owns the OpenAPI spec, controllers, schemas, and seed data. Spec is regenerated from a running arcadia at `http://localhost:4000/api/openapi` via `node ../lib-arcadia-client/scripts/sync-spec.mjs` (run from this directory).
+- **Backend reference** lives at `../reference/arcadia-core/`. Treat it as read-only documentation — it's the Phoenix umbrella app that owns the OpenAPI spec, controllers, schemas, and seed data. Spec is regenerated from a running arcadia at `http://localhost:4000/api/openapi` via `node ../lib-arcadia-core-client/scripts/sync-spec.mjs` (run from this directory).
 - **Skyrise** (`lib-theme-skyrise`) is the canonical theme — premium AI-first glass, iridescent body, vivid text, Apple-spring motion. Theme tweaks belong upstream in Vibespace + Skyrise, not here.
 - The brand string lives in **one place**: `app/lib/identity.ts` (`useBrand()` / `getBrand()`). Don't hardcode "Arcadia Admin" in components, page titles, or copy.
 
@@ -26,7 +26,7 @@ This file is a quick map, not a duplication of upstream docs.
 - `npm run dev` — Vite dev server (React Router 7).
 - `npm run build` — production build (`react-router build`).
 - `npm run start` — serve the built app (`react-router-serve ./build/server/index.js`).
-- `npm run typecheck` — `react-router typegen && tsc`. See gotcha below; may crash.
+- `npm run typecheck` — `react-router typegen && tsc`. **Works** (2026-07-14). Run it before every commit.
 - `start.sh` / `stop.sh` — repo's preferred way to run/stop the dev server in the background.
 
 - `npm run test` — Vitest run (vibespace-inherited setup; jsdom + @testing-library/react).
@@ -141,6 +141,7 @@ This repo was scaffolded from `create-crema-app`, which patches marker comments.
 
 ## Known gotchas
 
-- `npm run typecheck` may crash with a TypeScript internal error — pre-existing in the Crema toolchain. There's no test runner here, so rely on careful reads + dev server.
+- `npm run typecheck` **does not crash** — verified 2026-07-14. The old "it crashes, rely on careful reads" note was stale, and it cost us: a route shipped using `Input`/`Textarea` without importing them, which `tsc` reports instantly as TS2304 but nobody was running it. It currently reports ~39 pre-existing errors in `app/` (mostly `TS2322` prop mismatches) and more in sibling libs; treat *new* errors as blocking even while that backlog stands.
+- Every route that renders `<AppShell>` re-exports a shared route-level error boundary (`app/components/route-error.tsx`). Keep that export when adding routes — without it, one crashing panel replaces the entire console with an unstyled stack trace and strands the operator with no nav.
 - Vite "Outdated Optimize Dep" 504s after editing `vite.config.ts` or `tsconfig.json`: stop dev, `rm -rf node_modules/.vite`, restart, hard-reload.
 - After editing a sibling lib's exports, the dev server sometimes needs a manual restart to pick up the new types.
diff --git a/PRODUCT.md b/PRODUCT.md
new file mode 100644
index 0000000..fca9af3
--- /dev/null
+++ b/PRODUCT.md
@@ -0,0 +1,40 @@
+# Product
+
+## Register
+
+product
+
+## Users
+
+Two audiences share one build, split by JWT capability gating:
+
+- **Platform operators** (`platform_admin`) — Sky AI staff running the whole arcadia-core fleet: provisioning tenants, watching monitoring, rotating secrets, managing SSO, announcements, status page, integrations. Expert, technical, use it daily, usually on desktop.
+- **Tenant admins** (`tenant_admin`) — a customer's administrator managing their own tenant: users, memberships, plan, entitlements, storage, activity. Semi-technical; may visit rarely (only when something needs changing), so rediscoverability matters more than muscle memory.
+
+The job to be done is administrative control of a multi-tenant agentic-cloud platform: "get in, change the thing safely, verify it took effect, get out."
+
+## Product Purpose
+
+Arcadia Admin is the operator/admin UI for arcadia-core (multi-tenant Phoenix backend). It surfaces tenant lifecycle, user/role administration, billing (apps/plan/entitlements), storage, secrets, webhooks, scheduled tasks, SSO, announcements, status page, monitoring, and audit on top of arcadia's `/api/v1` and `/admin/*` endpoints. Success = an operator can onboard a new tenant end-to-end and change any runtime setting without reaching for iex/mix tasks or SSH.
+
+## Brand Personality
+
+Calm, capable, trustworthy. "Premium AI-first glass" (Skyrise theme) but the register is product: the tool should disappear into the task. Confidence through clarity and safe defaults, not decoration.
+
+## Anti-references
+
+- Enterprise admin sprawl (endless nested settings à la old AWS console).
+- Toy dashboards — fake stat tiles, decorative charts with no drill-down.
+- Anything that makes destructive platform actions (delete tenant, rotate secret) feel casual.
+
+## Design Principles
+
+1. **Safe by construction** — destructive/irreversible actions are explicit, confirmed, and auditable; errors name the fix.
+2. **One contract, everywhere** — capability map drives nav and guards; `data-action` ids on every interactive element (AI/script drivable).
+3. **Verify what you changed** — every mutation reflects visible state (toast + updated row + audit trail), never silent success.
+4. **Recognition over recall** — a tenant admin who shows up quarterly should find everything from the sidebar without training.
+5. **Density where experts live** — tables and panels can be dense, but each screen has one clear primary action.
+
+## Accessibility & Inclusion
+
+WCAG AA floor (4.5:1 body text), full keyboard operability, visible focus, labeled icons, `prefers-reduced-motion` honored. Desktop-first but mobile shell must remain usable (operators respond to incidents from phones).
diff --git a/README.md b/README.md
index e8986a3..c9272c9 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # Arcadia Admin
 
-Admin webapp for [arcadia-core](../reference/arcadia-app) — the multi-tenant Phoenix backend. Built on the [Crema design system](https://git.sky-ai.com/CremaUIStudio) with the **Skyrise** theme and started from the [Vibespace](../vibespace) starter.
+Admin webapp for [arcadia-core](../reference/arcadia-core) — the multi-tenant Phoenix backend. Built on the [Crema design system](https://git.sky-ai.com/CremaUIStudio) with the **Skyrise** theme and started from the [Vibespace](../vibespace) starter.
 
 Surfaces tenant management, user/role administration, billing, audit logs, storage configs, scheduled tasks, feature flags, and platform monitoring on top of arcadia's `/api/v1` and `/admin/*` endpoints.
 
@@ -15,7 +15,7 @@ Open [http://localhost:5173](http://localhost:5173). The app talks to arcadia at
 
 To use it for real:
 
-1. Have arcadia running locally (see `../reference/arcadia-app/DEV_SETUP.md`).
+1. Have arcadia running locally (see `../reference/arcadia-core/DEV_SETUP.md`).
 2. Visit `/login` and sign in with admin credentials. In dev seeds: `admin@example.com` / `AdminP@ssw0rd` (tenant `default`).
 
 ## Configuration
@@ -33,7 +33,7 @@ To use it for real:
 `app/components/layout/app-shell.tsx` — left rail + appbar + avatar dropdown. Brand identity in `app/lib/identity.ts` (`name: "Arcadia Admin"`, icon: `Shield`). The shell is **template code, not a lib** — fork it freely as admin features are added.
 
 ### Arcadia client + auth UI
-- [`@crema/arcadia-client`](../lib-arcadia-client) — typed HTTP client (generic + openapi-fetch-backed `client.typed`), Phoenix Channels realtime, error normalization. Mounted at the root via `<ArcadiaProvider>`.
+- [`@crema/arcadia-core-client`](../lib-arcadia-core-client) — typed HTTP client (generic + openapi-fetch-backed `client.typed`), Phoenix Channels realtime, error normalization. Mounted at the root via `<ArcadiaProvider>`.
 - [`@crema/arcadia-auth-ui`](../lib-arcadia-auth-ui) — login / signup / password reset / 2FA forms, themed via Skyrise tokens. The `/login` route renders `<LoginForm>`.
 
 ### Skyrise theme
@@ -50,8 +50,8 @@ Surface tints (`body[data-surface="snow|stone|sage|slate"]`) and dark mode (`htm
 your-workspace/
   arcadia-admin/                ← this repo
   vibespace/                    ← starter that this was cloned from
-  reference/arcadia-app/        ← Phoenix backend (read-only reference)
-  lib-arcadia-client/
+  reference/arcadia-core/        ← Phoenix backend (read-only reference)
+  lib-arcadia-core-client/
   lib-arcadia-auth-ui/
   lib-action-bus/
   lib-aifirst-ui/
@@ -84,4 +84,4 @@ your-workspace/
 - [`docs/AI_FIRST.md`](docs/AI_FIRST.md) — command-bus / DSL system tour
 - [`app/components/layout/THEME_CONTRACT.md`](app/components/layout/THEME_CONTRACT.md) — token contract every theme must satisfy
 - `CLAUDE.md` — orientation for an LLM working in this repo
-- `../reference/arcadia-app/` — backend (DEV_SETUP, controllers, OpenAPI source-of-truth)
+- `../reference/arcadia-core/` — backend (DEV_SETUP, controllers, OpenAPI source-of-truth)
diff --git a/app/app.css b/app/app.css
index 6dfa9da..91732a1 100644
--- a/app/app.css
+++ b/app/app.css
@@ -15,7 +15,7 @@
 @source "../../lib-aifirst-ui/src";
 @source "../../lib-llm-ui/src";
 @source "../../lib-action-bus/src";
-@source "../../lib-arcadia-client/src";
+@source "../../lib-arcadia-core-client/src";
 @source "../../lib-arcadia-auth-ui/src";
 @source "../../lib-table-ui/src";
 @source "../../lib-search-ui/src";
@@ -156,3 +156,21 @@
   }
 }
 
+
+/* Accessibility: honour a reduced-motion request. Skyrise leans on ambient
+ * drift (the aurora field), spring transitions, and looping keyframes; for
+ * anyone who asks for less motion, near-instant everything and freeze the
+ * decorative loops. This is the global guard the app previously lacked. */
+@media (prefers-reduced-motion: reduce) {
+  *,
+  *::before,
+  *::after {
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+    transition-duration: 0.01ms !important;
+    scroll-behavior: auto !important;
+  }
+  [data-slot="aurora-field"] {
+    animation: none !important;
+  }
+}
diff --git a/app/components/copy-id.tsx b/app/components/copy-id.tsx
new file mode 100644
index 0000000..fde3c7d
--- /dev/null
+++ b/app/components/copy-id.tsx
@@ -0,0 +1,51 @@
+import { useState } from "react"
+import { Check, Copy } from "lucide-react"
+
+/**
+ * A monospace id (UUID, slug, token name) that copies to the clipboard on
+ * click, with a brief checkmark. Raw ids are common in an admin console and
+ * useless if you can't get them into a support ticket or a CLI.
+ */
+export function CopyId({
+  value,
+  label,
+  className = "",
+  dataAction,
+}: {
+  value: string
+  /** What's being copied, for the aria-label. Defaults to "id". */
+  label?: string
+  className?: string
+  dataAction?: string
+}) {
+  const [copied, setCopied] = useState(false)
+
+  const copy = async () => {
+    try {
+      await navigator.clipboard.writeText(value)
+      setCopied(true)
+      setTimeout(() => setCopied(false), 1200)
+    } catch {
+      // Clipboard blocked (insecure context / permissions) — no-op; the value
+      // is still selectable by hand.
+    }
+  }
+
+  return (
+    <button
+      type="button"
+      onClick={copy}
+      data-action={dataAction}
+      aria-label={`Copy ${label ?? "id"}`}
+      title="Copy"
+      className={`group inline-flex max-w-full items-center gap-1 rounded bg-muted px-1.5 py-0.5 font-mono text-xs transition-colors hover:bg-accent ${className}`}
+    >
+      <span className="truncate">{value}</span>
+      {copied ? (
+        <Check className="size-3 shrink-0 text-emerald-500" />
+      ) : (
+        <Copy className="size-3 shrink-0 text-muted-foreground opacity-0 transition-opacity group-hover:opacity-100" />
+      )}
+    </button>
+  )
+}
diff --git a/app/components/data-state.tsx b/app/components/data-state.tsx
new file mode 100644
index 0000000..799370a
--- /dev/null
+++ b/app/components/data-state.tsx
@@ -0,0 +1,183 @@
+import { useEffect, useState, type ReactNode } from "react"
+import { AlertTriangle, RefreshCw, ShieldOff, WifiOff } from "lucide-react"
+import { LoadingOverlay } from "@crema/feedback-ui"
+
+import { Button } from "~/components/ui/button"
+import { describeError, type LoadError } from "~/lib/errors"
+
+/**
+ * The load-state discriminator every list screen renders through.
+ *
+ * The rule it enforces: **a failed load is never an empty one.** Screens used
+ * to render their "No events match those filters — loosen the filter set…"
+ * empty state underneath a red "Too Many Requests" banner, so an operator
+ * couldn't tell a quiet audit log from a broken one. Exactly one of
+ * error / loading / empty / content renders here, ever.
+ */
+export function DataState({
+  loading,
+  error,
+  isEmpty,
+  empty,
+  onRetry,
+  loadingLabel = "Loading…",
+  children,
+}: {
+  loading: boolean
+  /** The raw thrown value; normalised for display here. */
+  error: unknown
+  isEmpty: boolean
+  /** What to show when the load succeeded and there is genuinely nothing. */
+  empty: ReactNode
+  onRetry: () => void
+  loadingLabel?: string
+  children: ReactNode
+}) {
+  if (error) return <ErrorState error={error} onRetry={onRetry} />
+
+  // First load: nothing to show yet. Subsequent refreshes keep the table on
+  // screen and let the table's own `loading` prop dim it, so the page doesn't
+  // flash empty every time an operator hits Refresh.
+  if (loading && isEmpty)
+    return (
+      <div className="relative min-h-40">
+        <LoadingOverlay active label={loadingLabel} />
+      </div>
+    )
+
+  if (isEmpty) return <>{empty}</>
+
+  return <>{children}</>
+}
+
+export function ErrorState({
+  error,
+  onRetry,
+}: {
+  error: unknown
+  onRetry: () => void
+}) {
+  const d: LoadError = describeError(error)
+  const Icon =
+    d.status === 403 || d.status === 401
+      ? ShieldOff
+      : d.title === "Can't reach arcadia"
+        ? WifiOff
+        : AlertTriangle
+
+  return (
+    <div className="flex flex-col items-center gap-3 px-6 py-12 text-center">
+      <div className="flex size-10 items-center justify-center rounded-lg bg-destructive/10 text-destructive">
+        <Icon className="size-5" />
+      </div>
+
+      <div className="max-w-md space-y-1">
+        <p className="font-medium">{d.title}</p>
+        {d.detail ? (
+          <p className="text-sm text-muted-foreground">{d.detail}</p>
+        ) : null}
+        {d.fields?.length ? (
+          <ul className="mt-1 space-y-0.5 text-sm text-muted-foreground">
+            {d.fields.map((f) => (
+              <li key={f}>{f}</li>
+            ))}
+          </ul>
+        ) : null}
+      </div>
+
+      {d.retryable ? (
+        d.retryAfterSec ? (
+          <AutoRetry seconds={d.retryAfterSec} onRetry={onRetry} />
+        ) : (
+          <Button
+            data-action="data-state-retry"
+            variant="outline"
+            size="sm"
+            onClick={onRetry}
+          >
+            <RefreshCw className="size-4" />
+            Retry
+          </Button>
+        )
+      ) : null}
+    </div>
+  )
+}
+
+/**
+ * An error raised while a dialog is open, rendered *inside* that dialog.
+ *
+ * Page-level banners are invisible here: the modal scrim dims them and the
+ * dialog covers them. A failed submit has to speak where the operator is
+ * looking — right above the buttons they just pressed.
+ */
+export function DialogError({
+  error,
+  context = "save",
+}: {
+  error: unknown
+  context?: string
+}) {
+  const d = describeError(error, context)
+
+  return (
+    <div
+      role="alert"
+      className="flex items-start gap-2.5 rounded-md border border-destructive/30 bg-destructive/5 px-3 py-2.5"
+    >
+      <AlertTriangle className="mt-0.5 size-4 shrink-0 text-destructive" />
+      <div className="min-w-0 space-y-0.5 text-sm">
+        <p className="font-medium text-destructive">{d.title}</p>
+        {d.detail ? <p className="text-muted-foreground">{d.detail}</p> : null}
+        {d.fields?.length ? (
+          <ul className="space-y-0.5 text-muted-foreground">
+            {d.fields.map((f) => (
+              <li key={f}>{f}</li>
+            ))}
+          </ul>
+        ) : null}
+      </div>
+    </div>
+  )
+}
+
+/** 429s resolve on their own — count down, retry, and say so. Nagging the
+ *  operator to click Retry into a rate limiter would just extend it. */
+function AutoRetry({
+  seconds,
+  onRetry,
+}: {
+  seconds: number
+  onRetry: () => void
+}) {
+  const [left, setLeft] = useState(seconds)
+
+  useEffect(() => {
+    if (left <= 0) {
+      onRetry()
+      return
+    }
+    const t = setTimeout(() => setLeft((n) => n - 1), 1000)
+    return () => clearTimeout(t)
+    // `onRetry` is intentionally excluded: routes hand us a fresh closure each
+    // render, and depending on it would reset the countdown forever.
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [left])
+
+  return (
+    <div className="flex items-center gap-2">
+      <Button
+        data-action="data-state-retry"
+        variant="outline"
+        size="sm"
+        onClick={onRetry}
+      >
+        <RefreshCw className="size-4" />
+        Retry now
+      </Button>
+      <span className="text-xs text-muted-foreground" aria-live="polite">
+        retrying in {left}s
+      </span>
+    </div>
+  )
+}
diff --git a/app/components/layout/app-shell.tsx b/app/components/layout/app-shell.tsx
index ed6b1e9..09129cd 100644
--- a/app/components/layout/app-shell.tsx
+++ b/app/components/layout/app-shell.tsx
@@ -18,7 +18,6 @@ import {
   PanelLeftOpen,
   User as UserIcon,
   LogOut,
-  HelpCircle,
   Menu,
   Play,
   HardDrive,
@@ -38,9 +37,9 @@ import {
   Database,
   Plug,
   MessageSquare,
-  Eye,
-  LayoutGrid,
   CreditCard,
+  Flag,
+  Eye,
   // CREMA:NAV-ICONS
 } from "lucide-react"
 
@@ -68,7 +67,7 @@ import {
   PopoverTrigger,
 } from "~/components/ui/popover"
 import { profileInitials, useProfile } from "~/lib/profile"
-import { signOut, useSession } from "~/lib/session"
+import { endImpersonation, signOut, useSession } from "~/lib/session"
 import { capabilityForPath, useCapabilities } from "~/lib/capabilities"
 import {
   addNotification,
@@ -76,7 +75,6 @@ import {
   dismissAll,
   markAllRead,
   markRead,
-  seedIfEmpty,
   unreadCount,
   useNotifications,
 } from "~/lib/notifications"
@@ -121,7 +119,10 @@ const pinnedTop: NavItem[] = [
 ]
 
 // Pinned items render flat at the bottom of the rail, below all groups.
+// Audit log is cross-cutting rather than owned by any one group, so it sits
+// here next to Settings.
 const pinnedBottom: NavItem[] = [
+  { to: "/audit-log", icon: Activity, label: "Audit log" },
   { to: "/settings", icon: Settings, label: "Settings" },
 ]
 
@@ -132,9 +133,9 @@ const navGroups: NavGroup[] = [
     icon: Building2,
     items: [
       { to: "/tenants", icon: Building2, label: "Tenants" },
-      { to: "/memberships", icon: UserCheck, label: "Memberships" },
       { to: "/organizations", icon: Building, label: "Organizations" },
       { to: "/users", icon: UsersIcon, label: "Users" },
+      { to: "/memberships", icon: UserCheck, label: "Memberships" },
       { to: "/sso", icon: ShieldCheck, label: "SSO" },
     ],
   },
@@ -142,11 +143,9 @@ const navGroups: NavGroup[] = [
     key: "billing",
     label: "Billing",
     icon: CreditCard,
-    items: [
-      { to: "/apps", icon: LayoutGrid, label: "Apps" },
-      { to: "/plan", icon: CreditCard, label: "Plan" },
-      { to: "/entitlements", icon: Gauge, label: "Entitlements" },
-    ],
+    // One item today (Plan/Entitlements/Apps collapsed here — none has a live
+    // endpoint yet). They split back into siblings under this group once wired.
+    items: [{ to: "/billing", icon: CreditCard, label: "Plan & usage" }],
   },
   {
     key: "data",
@@ -156,17 +155,26 @@ const navGroups: NavGroup[] = [
       { to: "/storage", icon: HardDrive, label: "Storage" },
       { to: "/buckets", icon: Boxes, label: "Buckets" },
       { to: "/secrets", icon: KeyRound, label: "Secrets" },
+    ],
+  },
+  {
+    key: "automation",
+    label: "Automation",
+    icon: Plug,
+    items: [
+      { to: "/feature-flags", icon: Flag, label: "Feature flags" },
+      { to: "/webhooks", icon: WebhookIcon, label: "Webhooks" },
+      { to: "/scheduled-tasks", icon: CalendarClock, label: "Scheduled" },
       { to: "/integrations", icon: Plug, label: "Integrations" },
     ],
   },
   {
-    key: "integrations",
-    label: "Integrations",
-    icon: Plug,
+    key: "infrastructure",
+    label: "Infrastructure",
+    icon: Network,
     items: [
-      { to: "/webhooks", icon: WebhookIcon, label: "Webhooks" },
-      { to: "/scheduled-tasks", icon: CalendarClock, label: "Scheduled" },
       { to: "/networking", icon: Network, label: "Networking" },
+      { to: "/monitoring", icon: Gauge, label: "Monitoring" },
     ],
   },
   {
@@ -178,15 +186,6 @@ const navGroups: NavGroup[] = [
       { to: "/status-page", icon: AlertOctagon, label: "Status page" },
     ],
   },
-  {
-    key: "observability",
-    label: "Observability",
-    icon: Eye,
-    items: [
-      { to: "/monitoring", icon: Gauge, label: "Monitoring" },
-      { to: "/activity", icon: Activity, label: "Audit log" },
-    ],
-  },
   {
     key: "ai",
     label: "AI & Search",
@@ -260,8 +259,12 @@ export function AppShell({
   // short-circuit so a sign-out doesn't reduce the hook count and trip
   // React's "rendered fewer hooks than expected" check.
   const [expanded, setExpanded] = useState<boolean>(() => {
-    if (typeof window === "undefined") return false
-    return localStorage.getItem(SIDEBAR_KEY) === "1"
+    if (typeof window === "undefined") return true
+    // Default to expanded on first run — an icon-only rail of ~18 pictograms is
+    // unreadable to anyone who hasn't memorised it. Collapse stays available and
+    // is remembered once chosen.
+    const stored = localStorage.getItem(SIDEBAR_KEY)
+    return stored === null ? true : stored === "1"
   })
   useEffect(() => {
     localStorage.setItem(SIDEBAR_KEY, expanded ? "1" : "0")
@@ -357,7 +360,7 @@ export function AppShell({
         data-slot="sidebar"
         data-expanded={expanded ? "true" : "false"}
         className={[
-          "sticky top-0 z-30 hidden h-svh shrink-0 flex-col border-r bg-sidebar transition-[width] duration-base ease-standard md:flex",
+          "sticky top-0 z-30 hidden h-svh shrink-0 flex-col border-r bg-sidebar transition-[width] duration-base ease-standard motion-reduce:transition-none md:flex",
           expanded ? "w-60" : "w-16",
         ].join(" ")}
       >
@@ -468,6 +471,7 @@ export function AppShell({
       </aside>
 
       <main className="flex min-w-0 flex-1 flex-col">
+        <ImpersonationBanner />
         {/* Mobile-only menu trigger, floating top-left of main */}
         <Sheet open={mobileOpen} onOpenChange={setMobileOpen}>
           <SheetTrigger
@@ -627,9 +631,6 @@ export function AppShell({
               >
                 <Settings /> Settings
               </DropdownMenuItem>
-              <DropdownMenuItem data-action="avatar-help">
-                <HelpCircle /> Help
-              </DropdownMenuItem>
               <DropdownMenuSeparator />
               <DropdownMenuItem
                 data-action="avatar-signout"
@@ -655,7 +656,10 @@ export function AppShell({
               one floating card in a sea of black. The floating actions
               pill is fixed to the viewport edge and lives outside this
               column, so it stays clear regardless of cap width. */}
-          <div className="mx-auto flex w-full max-w-[1180px] flex-1 flex-col gap-6 p-6 [&>*:first-child]:lg:pr-72">
+          {/* pt-16 on mobile reserves a row for the floating hamburger (left)
+              and actions pill (right) so they never overlap the page H1; the
+              desktop rail/pill sit outside this column, so pt drops to p-6. */}
+          <div className="mx-auto flex w-full max-w-[1180px] flex-1 flex-col gap-6 px-4 pb-6 pt-16 md:p-6 [&>*:first-child]:lg:pr-72">
             <RouteGuard>{children}</RouteGuard>
           </div>
         </div>
@@ -692,6 +696,9 @@ function NavRow({
       to={item.to}
       end={item.end}
       title={expanded ? undefined : item.label}
+      // When collapsed there's no visible label text, only an icon — give
+      // screen readers the name explicitly (title alone isn't reliably read).
+      aria-label={expanded ? undefined : item.label}
       onClick={onNavigate}
       data-action={`${prefix}${item.label.toLowerCase()}`}
       className={({ isActive }) =>
@@ -790,15 +797,42 @@ function NotificationDispatcher() {
   )
 }
 
+function ImpersonationBanner() {
+  const session = useSession()
+  const navigate = useNavigate()
+  if (!session?.impersonatedBy) return null
+
+  return (
+    <div
+      role="alert"
+      data-slot="impersonation-banner"
+      className="sticky top-0 z-40 flex flex-wrap items-center justify-center gap-x-3 gap-y-1 border-b border-amber-500/40 bg-amber-500/15 px-4 py-2 text-sm text-amber-900 backdrop-blur-sm dark:text-amber-200"
+    >
+      <span className="inline-flex items-center gap-1.5">
+        <Eye className="size-4" />
+        Viewing as <span className="font-semibold">{session.email}</span> — actions you take
+        happen as this user.
+      </span>
+      <button
+        type="button"
+        data-action="impersonation-stop"
+        onClick={() => {
+          endImpersonation()
+          navigate("/users")
+        }}
+        className="rounded-md border border-amber-600/40 px-2 py-0.5 font-medium transition-colors hover:bg-amber-500/25"
+      >
+        Stop impersonating
+      </button>
+    </div>
+  )
+}
+
 function NotificationsBell() {
   const items = useNotifications()
   const unread = unreadCount(items)
   const navigate = useNavigate()
 
-  useEffect(() => {
-    seedIfEmpty()
-  }, [])
-
   return (
     <Popover>
       <PopoverTrigger
diff --git a/app/components/route-error.tsx b/app/components/route-error.tsx
new file mode 100644
index 0000000..a950fe3
--- /dev/null
+++ b/app/components/route-error.tsx
@@ -0,0 +1,104 @@
+import { isRouteErrorResponse, useNavigate, useRouteError } from "react-router"
+import { AlertTriangle, RefreshCw, Home } from "lucide-react"
+
+import { AppShell } from "~/components/layout/app-shell"
+import { Button } from "~/components/ui/button"
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "~/components/ui/card"
+
+/**
+ * Route-level error boundary.
+ *
+ * Re-export this as `ErrorBoundary` from any route and a crash in that route
+ * degrades to a single explained card *inside the shell* — the nav, the theme
+ * and every other screen stay reachable. The root boundary in `root.tsx` still
+ * exists as the last resort, but it replaces the whole app with an unstyled
+ * stack trace, which strands an operator mid-incident with no way out.
+ *
+ *     export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
+ */
+export function RouteErrorBoundary() {
+  const error = useRouteError()
+  const navigate = useNavigate()
+
+  let title = "This screen hit an error"
+  let description =
+    "Something on this page failed to render. The rest of the console still works — you can retry, or head back to the overview."
+
+  if (isRouteErrorResponse(error)) {
+    if (error.status === 404) {
+      title = "That page doesn't exist"
+      description = "The link may be stale, or the screen may have been renamed."
+    } else {
+      title = `Request failed (${error.status})`
+      description =
+        error.statusText ||
+        "The server rejected this request. Retry, and if it keeps failing check the service logs."
+    }
+  }
+
+  // The message is useful to an operator even in prod — it's their own platform.
+  // The stack is noise unless you're the one fixing it, so it stays in dev.
+  const message = error instanceof Error ? error.message : null
+  const stack =
+    import.meta.env.DEV && error instanceof Error ? error.stack : undefined
+
+  return (
+    <AppShell>
+      <Card>
+        <CardHeader>
+          <div className="flex items-start gap-3">
+            <div className="flex size-10 shrink-0 items-center justify-center rounded-lg bg-destructive/10 text-destructive">
+              <AlertTriangle className="size-5" />
+            </div>
+            <div className="min-w-0">
+              <CardTitle>{title}</CardTitle>
+              <CardDescription>{description}</CardDescription>
+            </div>
+          </div>
+        </CardHeader>
+        <CardContent className="flex flex-col gap-4">
+          {message ? (
+            <p className="rounded-md border bg-muted/30 px-3 py-2 font-mono text-xs text-muted-foreground">
+              {message}
+            </p>
+          ) : null}
+
+          <div className="flex flex-wrap items-center gap-2">
+            <Button
+              data-action="route-error-retry"
+              onClick={() => window.location.reload()}
+            >
+              <RefreshCw className="size-4" />
+              Retry
+            </Button>
+            <Button
+              data-action="route-error-home"
+              variant="outline"
+              onClick={() => navigate("/")}
+            >
+              <Home className="size-4" />
+              Back to overview
+            </Button>
+          </div>
+
+          {stack ? (
+            <details className="rounded-md border bg-muted/20 px-3 py-2 text-sm">
+              <summary className="cursor-pointer text-muted-foreground">
+                Stack trace (dev only)
+              </summary>
+              <pre className="mt-2 overflow-x-auto text-xs">
+                <code>{stack}</code>
+              </pre>
+            </details>
+          ) : null}
+        </CardContent>
+      </Card>
+    </AppShell>
+  )
+}
diff --git a/app/components/route-guard.tsx b/app/components/route-guard.tsx
index 927fd5f..7e7bff0 100644
--- a/app/components/route-guard.tsx
+++ b/app/components/route-guard.tsx
@@ -39,9 +39,10 @@ function Forbidden({ capability }: { capability: Capability }) {
           <ShieldAlert className="size-10 text-muted-foreground" />
           <h2 className="text-lg font-semibold">You can't access this page</h2>
           <p className="text-sm text-muted-foreground">
-            This view requires the <code className="font-mono text-xs">{capability}</code>{" "}
-            capability on your active tenant. If you think you should have it,
-            switch tenants from the avatar menu or ask an admin.
+            This view needs the{" "}
+            <code className="font-mono text-xs">{capability}</code> capability,
+            which your account doesn't hold on the current tenant. Ask a platform
+            administrator to grant it.
           </p>
         </CardContent>
       </Card>
diff --git a/app/components/settings/llm-configurations-panel.tsx b/app/components/settings/llm-configurations-panel.tsx
index 23e6554..cb1f72a 100644
--- a/app/components/settings/llm-configurations-panel.tsx
+++ b/app/components/settings/llm-configurations-panel.tsx
@@ -9,7 +9,7 @@
 
 import { useCallback, useEffect, useMemo, useState } from "react"
 import { Pencil, Plus, Sparkles, Star, Trash2, Upload } from "lucide-react"
-import { useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
 import {
   loadSettings as loadActiveSettings,
   saveSettings as saveActiveSettings,
diff --git a/app/components/tenant-detail/branding-tab.tsx b/app/components/tenant-detail/branding-tab.tsx
new file mode 100644
index 0000000..0cba271
--- /dev/null
+++ b/app/components/tenant-detail/branding-tab.tsx
@@ -0,0 +1,201 @@
+import { useState } from "react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+
+import { TenantSection, Field } from "~/components/tenant-detail/section"
+import { Input } from "~/components/ui/input"
+import { Textarea } from "~/components/ui/textarea"
+import { updateBranding } from "~/lib/arcadia/tenants"
+import type { TenantTabProps } from "~/routes/tenants.$id"
+
+/**
+ * Tenant branding: logo/favicon URLs, the three brand colours, and a custom-CSS
+ * override. All fields are optional; clearing one and saving sends `null` so it
+ * clears server-side (the server accepts null and validates any colour it does
+ * get against a `#rrggbb` hex).
+ */
+export function BrandingTab({ tenant, reload }: TenantTabProps) {
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+  const b = tenant.branding
+
+  const [logoUrl, setLogoUrl] = useState(b.logo_url ?? "")
+  const [faviconUrl, setFaviconUrl] = useState(b.favicon_url ?? "")
+  const [primary, setPrimary] = useState(b.primary_color ?? "")
+  const [secondary, setSecondary] = useState(b.secondary_color ?? "")
+  const [accent, setAccent] = useState(b.accent_color ?? "")
+  const [customCss, setCustomCss] = useState(b.custom_css ?? "")
+
+  const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
+
+  const dirty =
+    logoUrl !== (b.logo_url ?? "") ||
+    faviconUrl !== (b.favicon_url ?? "") ||
+    primary !== (b.primary_color ?? "") ||
+    secondary !== (b.secondary_color ?? "") ||
+    accent !== (b.accent_color ?? "") ||
+    customCss !== (b.custom_css ?? "")
+
+  const save = async () => {
+    setSaving(true)
+    setError(null)
+    try {
+      await updateBranding(arcadia, tenant.id, {
+        logo_url: emptyToNull(logoUrl),
+        favicon_url: emptyToNull(faviconUrl),
+        primary_color: emptyToNull(primary),
+        secondary_color: emptyToNull(secondary),
+        accent_color: emptyToNull(accent),
+        custom_css: customCss.trim() === "" ? null : customCss,
+      })
+      await reload()
+      toast.success("Branding updated")
+    } catch (err) {
+      setError(err)
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  return (
+    <TenantSection
+      title="Branding"
+      description="How this tenant's apps present themselves. Leave a field blank to fall back to the platform default; clearing a saved value removes it."
+      onSubmit={save}
+      saving={saving}
+      error={error}
+      errorContext="update branding"
+      dirty={dirty}
+      dataAction="tenant-detail-branding-save"
+    >
+      <Field
+        label="Logo URL"
+        htmlFor="branding-logo-url"
+        hint="Publicly reachable image URL shown in the tenant's app header."
+      >
+        <Input
+          id="branding-logo-url"
+          type="url"
+          value={logoUrl}
+          onChange={(e) => setLogoUrl(e.target.value)}
+          placeholder="https://…"
+          data-action="tenant-detail-branding-logo-url"
+        />
+      </Field>
+
+      <Field
+        label="Favicon URL"
+        htmlFor="branding-favicon-url"
+        hint="Publicly reachable .ico/.png used as the browser tab icon."
+      >
+        <Input
+          id="branding-favicon-url"
+          type="url"
+          value={faviconUrl}
+          onChange={(e) => setFaviconUrl(e.target.value)}
+          placeholder="https://…"
+          data-action="tenant-detail-branding-favicon-url"
+        />
+      </Field>
+
+      <ColorField
+        label="Primary color"
+        id="branding-primary-color"
+        value={primary}
+        onChange={setPrimary}
+        dataAction="tenant-detail-branding-primary-color"
+      />
+      <ColorField
+        label="Secondary color"
+        id="branding-secondary-color"
+        value={secondary}
+        onChange={setSecondary}
+        dataAction="tenant-detail-branding-secondary-color"
+      />
+      <ColorField
+        label="Accent color"
+        id="branding-accent-color"
+        value={accent}
+        onChange={setAccent}
+        dataAction="tenant-detail-branding-accent-color"
+      />
+
+      <Field
+        label="Custom CSS"
+        htmlFor="branding-custom-css"
+        hint="Injected into the tenant's apps. Applies verbatim — test before saving."
+      >
+        <Textarea
+          id="branding-custom-css"
+          value={customCss}
+          onChange={(e) => setCustomCss(e.target.value)}
+          rows={6}
+          spellCheck={false}
+          className="font-mono text-xs"
+          placeholder=":root { --brand: #5b21b6; }"
+          data-action="tenant-detail-branding-custom-css"
+        />
+      </Field>
+    </TenantSection>
+  )
+}
+
+/**
+ * A hex-colour control: a native colour swatch and a text input kept in sync,
+ * plus a live preview chip. The text field holds the source of truth (may be
+ * empty or a partial/invalid hex mid-edit); the swatch falls back to black so
+ * the picker always has something to show.
+ */
+function ColorField({
+  label,
+  id,
+  value,
+  onChange,
+  dataAction,
+}: {
+  label: string
+  id: string
+  value: string
+  onChange: (v: string) => void
+  dataAction: string
+}) {
+  const trimmed = value.trim()
+  const valid = /^#[0-9a-fA-F]{6}$/.test(trimmed)
+
+  return (
+    <Field label={label} htmlFor={id} hint="Hex like #5b21b6. Clear to remove.">
+      <div className="flex items-center gap-2">
+        <Input
+          type="color"
+          aria-label={`${label} swatch`}
+          value={valid ? trimmed : "#000000"}
+          onChange={(e) => onChange(e.target.value)}
+          className="h-8 w-12 shrink-0 cursor-pointer p-1"
+          data-action={`${dataAction}-swatch`}
+        />
+        <Input
+          id={id}
+          type="text"
+          value={value}
+          onChange={(e) => onChange(e.target.value)}
+          placeholder="#000000"
+          className="font-mono"
+          data-action={dataAction}
+        />
+        <span
+          aria-hidden="true"
+          title={valid ? trimmed : "No colour"}
+          className="size-8 shrink-0 rounded-lg border border-input"
+          style={{ background: valid ? trimmed : "transparent" }}
+        />
+      </div>
+    </Field>
+  )
+}
+
+/** Trim to detect emptiness; a blank field clears server-side via null. */
+function emptyToNull(s: string): string | null {
+  return s.trim() === "" ? null : s.trim()
+}
diff --git a/app/components/tenant-detail/delivery-tab.tsx b/app/components/tenant-detail/delivery-tab.tsx
new file mode 100644
index 0000000..69d9300
--- /dev/null
+++ b/app/components/tenant-detail/delivery-tab.tsx
@@ -0,0 +1,364 @@
+import { useCallback, useEffect, useState } from "react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+
+import { TenantSection, Field } from "~/components/tenant-detail/section"
+import { Button } from "~/components/ui/button"
+import { Input } from "~/components/ui/input"
+import { Switch } from "~/components/ui/switch"
+import { NativeSelect, NativeSelectOption } from "~/components/ui/native-select"
+import {
+  EMAIL_PROVIDERS,
+  SMS_PROVIDERS,
+  deleteEmailConfig,
+  deleteSmsConfig,
+  getEmailConfig,
+  getSmsConfig,
+  testEmailConfig,
+  testSmsConfig,
+  upsertEmailConfig,
+  upsertSmsConfig,
+  type EmailConfigInput,
+  type SmsConfigInput,
+} from "~/lib/arcadia/tenants"
+import { errorMessage } from "~/lib/errors"
+import type { TenantTabProps } from "~/routes/tenants.$id"
+
+/**
+ * Email & SMS delivery. These are two independent configs — each loads, saves,
+ * tests, and deletes on its own — so the tab renders the same <DeliveryConfig>
+ * frame twice, parameterised by `kind`.
+ */
+export function DeliveryTab({ tenant, reload }: TenantTabProps) {
+  return (
+    <div className="flex flex-col gap-6">
+      <DeliveryConfig kind="email" tenant={tenant} reload={reload} />
+      <DeliveryConfig kind="sms" tenant={tenant} reload={reload} />
+    </div>
+  )
+}
+
+type Kind = "email" | "sms"
+
+/** A credential input the operator can fill. Values are collected into the
+ *  write-only `credentials` object and only sent when actually typed. */
+type CredField = { key: string; label: string; type?: string }
+
+function credentialFields(kind: Kind, provider: string): CredField[] {
+  if (kind === "email") {
+    if (provider === "smtp") {
+      return [
+        { key: "host", label: "SMTP host" },
+        { key: "port", label: "Port" },
+        { key: "username", label: "Username" },
+        { key: "password", label: "Password", type: "password" },
+      ]
+    }
+    return [{ key: "api_key", label: "API key", type: "password" }]
+  }
+  // sms
+  if (provider === "twilio") {
+    return [
+      { key: "account_sid", label: "Account SID" },
+      { key: "auth_token", label: "Auth token", type: "password" },
+    ]
+  }
+  if (provider === "vonage") {
+    return [
+      { key: "api_key", label: "API key" },
+      { key: "api_secret", label: "API secret", type: "password" },
+    ]
+  }
+  return [{ key: "api_key", label: "API key", type: "password" }]
+}
+
+function DeliveryConfig({ tenant, kind }: TenantTabProps & { kind: Kind }) {
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+
+  const providers = kind === "email" ? EMAIL_PROVIDERS : SMS_PROVIDERS
+  const prefix = `tenant-detail-${kind}`
+  const label = kind === "email" ? "Email" : "SMS"
+
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<unknown>(null)
+  const [saving, setSaving] = useState(false)
+  const [testing, setTesting] = useState(false)
+  const [removing, setRemoving] = useState(false)
+  // Whether a config exists server-side (loaded non-null, or just saved). Gates
+  // "Send test" and "Remove", which are meaningless with nothing configured.
+  const [exists, setExists] = useState(false)
+
+  const [provider, setProvider] = useState<string>(providers[0])
+  const [enabled, setEnabled] = useState(false)
+  // email-only
+  const [fromEmail, setFromEmail] = useState("")
+  const [fromName, setFromName] = useState("")
+  const [replyTo, setReplyTo] = useState("")
+  // sms-only
+  const [fromNumber, setFromNumber] = useState("")
+  // write-only credentials, keyed by field
+  const [creds, setCreds] = useState<Record<string, string>>({})
+
+  const load = useCallback(async () => {
+    setError(null)
+    setLoading(true)
+    try {
+      if (kind === "email") {
+        const cfg = await getEmailConfig(arcadia, tenant.id)
+        if (cfg) {
+          setExists(true)
+          setProvider(cfg.provider)
+          setEnabled(cfg.enabled)
+          setFromEmail(cfg.from_email ?? "")
+          setFromName(cfg.from_name ?? "")
+          setReplyTo(cfg.reply_to ?? "")
+        } else {
+          setExists(false)
+        }
+      } else {
+        const cfg = await getSmsConfig(arcadia, tenant.id)
+        if (cfg) {
+          setExists(true)
+          setProvider(cfg.provider)
+          setEnabled(cfg.enabled)
+          setFromNumber(cfg.from_number ?? "")
+        } else {
+          setExists(false)
+        }
+      }
+      // Credentials are never returned — always start the write-only fields empty.
+      setCreds({})
+    } catch (err) {
+      // getEmailConfig/getSmsConfig already map 404 → null, so anything thrown
+      // here is a genuine load failure.
+      setError(err)
+    } finally {
+      setLoading(false)
+    }
+  }, [arcadia, tenant.id, kind])
+
+  useEffect(() => {
+    load()
+  }, [load])
+
+  const save = async () => {
+    setSaving(true)
+    setError(null)
+    try {
+      // Only send credentials the operator actually typed, scoped to the
+      // current provider — otherwise we'd wipe stored creds with blanks, or
+      // leak a previous provider's fields.
+      const typedCreds: Record<string, string> = {}
+      for (const f of credentialFields(kind, provider)) {
+        const v = (creds[f.key] ?? "").trim()
+        if (v) typedCreds[f.key] = v
+      }
+      const hasCreds = Object.keys(typedCreds).length > 0
+
+      if (kind === "email") {
+        const input: EmailConfigInput = {
+          provider,
+          from_email: fromEmail,
+          from_name: fromName,
+          reply_to: replyTo,
+          enabled,
+          ...(hasCreds ? { credentials: typedCreds } : {}),
+        }
+        await upsertEmailConfig(arcadia, tenant.id, input)
+        toast.success("Email settings saved")
+      } else {
+        const input: SmsConfigInput = {
+          provider,
+          from_number: fromNumber,
+          enabled,
+          ...(hasCreds ? { credentials: typedCreds } : {}),
+        }
+        await upsertSmsConfig(arcadia, tenant.id, input)
+        toast.success("SMS settings saved")
+      }
+      await load()
+    } catch (err) {
+      setError(err)
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  const runTest = async () => {
+    setTesting(true)
+    try {
+      const res =
+        kind === "email"
+          ? await testEmailConfig(arcadia, tenant.id)
+          : await testSmsConfig(arcadia, tenant.id)
+      if (res.ok) toast.success(res.message || `${label} test succeeded`)
+      else toast.error(res.message || `${label} test failed`)
+    } catch (err) {
+      toast.error(errorMessage(err, `test ${label.toLowerCase()} delivery`))
+    } finally {
+      setTesting(false)
+    }
+  }
+
+  const remove = async () => {
+    setRemoving(true)
+    try {
+      if (kind === "email") await deleteEmailConfig(arcadia, tenant.id)
+      else await deleteSmsConfig(arcadia, tenant.id)
+      toast.success(`${label} configuration removed`)
+      await load()
+    } catch (err) {
+      toast.error(errorMessage(err, `remove ${label.toLowerCase()} configuration`))
+    } finally {
+      setRemoving(false)
+    }
+  }
+
+  const fields = credentialFields(kind, provider)
+
+  return (
+    <TenantSection
+      title={`${label} delivery`}
+      description={
+        kind === "email"
+          ? "Outbound email for this tenant. Credentials are write-only and never shown again."
+          : "Outbound SMS for this tenant. Credentials are write-only and never shown again."
+      }
+      onSubmit={save}
+      saving={saving || loading}
+      error={error}
+      errorContext={`save ${label.toLowerCase()} settings`}
+      saveLabel={kind === "email" ? "Save email settings" : "Save SMS settings"}
+      dataAction={`${prefix}-save`}
+      footerExtra={
+        exists ? (
+          <div className="flex items-center gap-2">
+            <Button
+              type="button"
+              variant="outline"
+              onClick={runTest}
+              disabled={testing || saving}
+              data-action={`${prefix}-test`}
+            >
+              {testing ? "Testing…" : "Send test"}
+            </Button>
+            <Button
+              type="button"
+              variant="ghost"
+              className="text-destructive"
+              onClick={remove}
+              disabled={removing || saving}
+              data-action={`${prefix}-remove`}
+            >
+              {removing ? "Removing…" : "Remove configuration"}
+            </Button>
+          </div>
+        ) : null
+      }
+    >
+      <Field label="Provider" htmlFor={`${prefix}-provider`}>
+        <NativeSelect
+          id={`${prefix}-provider`}
+          className="w-full"
+          value={provider}
+          onChange={(e) => setProvider(e.target.value)}
+          data-action={`${prefix}-provider`}
+        >
+          {providers.map((p) => (
+            <NativeSelectOption key={p} value={p}>
+              {p}
+            </NativeSelectOption>
+          ))}
+        </NativeSelect>
+      </Field>
+
+      {kind === "email" ? (
+        <>
+          <Field label="From email" htmlFor={`${prefix}-from-email`}>
+            <Input
+              id={`${prefix}-from-email`}
+              type="email"
+              value={fromEmail}
+              onChange={(e) => setFromEmail(e.target.value)}
+              placeholder="no-reply@example.com"
+              data-action={`${prefix}-from-email`}
+            />
+          </Field>
+          <Field label="From name" htmlFor={`${prefix}-from-name`}>
+            <Input
+              id={`${prefix}-from-name`}
+              value={fromName}
+              onChange={(e) => setFromName(e.target.value)}
+              placeholder="Example App"
+              data-action={`${prefix}-from-name`}
+            />
+          </Field>
+          <Field label="Reply-to" htmlFor={`${prefix}-reply-to`}>
+            <Input
+              id={`${prefix}-reply-to`}
+              type="email"
+              value={replyTo}
+              onChange={(e) => setReplyTo(e.target.value)}
+              placeholder="support@example.com"
+              data-action={`${prefix}-reply-to`}
+            />
+          </Field>
+        </>
+      ) : (
+        <Field
+          label="From number"
+          htmlFor={`${prefix}-from-number`}
+          hint="The sender number or short code, in E.164 (e.g. +15551234567)."
+        >
+          <Input
+            id={`${prefix}-from-number`}
+            value={fromNumber}
+            onChange={(e) => setFromNumber(e.target.value)}
+            placeholder="+15551234567"
+            data-action={`${prefix}-from-number`}
+          />
+        </Field>
+      )}
+
+      <div className="flex items-center justify-between gap-3">
+        <div>
+          <div className="text-sm font-medium">Enabled</div>
+          <p className="text-xs text-muted-foreground">
+            When off, {label.toLowerCase()} is configured but not sent.
+          </p>
+        </div>
+        <Switch
+          checked={enabled}
+          onCheckedChange={(v) => setEnabled(v)}
+          data-action={`${prefix}-enabled`}
+        />
+      </div>
+
+      <div className="flex flex-col gap-4 rounded-lg border border-input bg-muted/30 p-4">
+        <div>
+          <div className="text-sm font-medium">Credentials</div>
+          <p className="text-xs text-muted-foreground">
+            {exists
+              ? "Write-only and never shown again. Leave blank to keep the stored credentials; fill in to replace them."
+              : "Write-only and never shown again."}
+          </p>
+        </div>
+        {fields.map((f) => (
+          <Field key={f.key} label={f.label} htmlFor={`${prefix}-cred-${f.key}`}>
+            <Input
+              id={`${prefix}-cred-${f.key}`}
+              type={f.type ?? "text"}
+              autoComplete="off"
+              value={creds[f.key] ?? ""}
+              onChange={(e) => setCreds((c) => ({ ...c, [f.key]: e.target.value }))}
+              placeholder={exists ? "•••••• (unchanged)" : ""}
+              data-action={`${prefix}-cred-${f.key}`}
+            />
+          </Field>
+        ))}
+      </div>
+    </TenantSection>
+  )
+}
diff --git a/app/components/tenant-detail/feature-flags-tab.tsx b/app/components/tenant-detail/feature-flags-tab.tsx
new file mode 100644
index 0000000..ab6c834
--- /dev/null
+++ b/app/components/tenant-detail/feature-flags-tab.tsx
@@ -0,0 +1,174 @@
+import { useCallback, useEffect, useState } from "react"
+import { RefreshCw, RotateCcw } from "lucide-react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+import { BadgeCell } from "@crema/table-ui"
+import { EmptyState } from "@crema/feedback-ui"
+
+import type { TenantTabProps } from "~/routes/tenants.$id"
+import { DataState } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
+import { Button } from "~/components/ui/button"
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "~/components/ui/card"
+import { Switch } from "~/components/ui/switch"
+import {
+  clearFeatureFlag,
+  listFeatureFlags,
+  setFeatureFlag,
+  type TenantFeatureFlag,
+} from "~/lib/arcadia/tenants"
+
+/**
+ * Per-tenant feature-flag overrides. The list is every platform-defined flag
+ * with this tenant's effective value; a flag is either inherited from the
+ * platform default ("default") or pinned for this tenant ("override"). Toggling
+ * a row pins it; "Revert" drops the override so it follows the default again.
+ * You can't add arbitrary keys here — a flag has to exist at the platform level
+ * before a tenant can override it.
+ */
+export function FeatureFlagsTab({ tenant }: TenantTabProps) {
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+
+  const [flags, setFlags] = useState<TenantFeatureFlag[]>([])
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<unknown>(null)
+  const [busy, setBusy] = useState<string | null>(null)
+
+  const load = useCallback(async () => {
+    setError(null)
+    setLoading(true)
+    try {
+      setFlags(await listFeatureFlags(arcadia, tenant.id))
+    } catch (err) {
+      setError(err)
+    } finally {
+      setLoading(false)
+    }
+  }, [arcadia, tenant.id])
+
+  useEffect(() => {
+    load()
+  }, [load])
+
+  const toggle = async (flag: TenantFeatureFlag, next: boolean) => {
+    setBusy(flag.key)
+    // Optimistic: reflect the pin immediately, roll back on failure.
+    setFlags((prev) =>
+      prev.map((f) => (f.key === flag.key ? { ...f, enabled: next, source: "override" } : f)),
+    )
+    try {
+      await setFeatureFlag(arcadia, tenant.id, flag.key, next)
+      toast.success(`${next ? "Enabled" : "Disabled"} ${flag.key} for ${tenant.name}`)
+      await load()
+    } catch (err) {
+      setFlags((prev) => prev.map((f) => (f.key === flag.key ? flag : f)))
+      toast.error(errorMessage(err, `override ${flag.key}`))
+    } finally {
+      setBusy(null)
+    }
+  }
+
+  const revert = async (flag: TenantFeatureFlag) => {
+    setBusy(flag.key)
+    try {
+      await clearFeatureFlag(arcadia, tenant.id, flag.key)
+      toast.success(`${flag.key} follows the platform default again`)
+      await load()
+    } catch (err) {
+      toast.error(errorMessage(err, `revert ${flag.key}`))
+    } finally {
+      setBusy(null)
+    }
+  }
+
+  return (
+    <Card>
+      <CardHeader className="flex flex-row items-start justify-between gap-4">
+        <div>
+          <CardTitle>Feature flags</CardTitle>
+          <CardDescription>
+            Override a platform flag for this tenant. Un-overridden flags follow
+            the platform default.
+          </CardDescription>
+        </div>
+        <Button
+          variant="outline"
+          size="sm"
+          onClick={load}
+          disabled={loading}
+          data-action="tenant-detail-flags-refresh"
+        >
+          <RefreshCw className={`size-4 ${loading ? "animate-spin" : ""}`} />
+          Refresh
+        </Button>
+      </CardHeader>
+      <CardContent className="p-0">
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={flags.length === 0}
+          onRetry={load}
+          loadingLabel="Loading feature flags…"
+          empty={
+            <EmptyState
+              title="No platform feature flags defined"
+              description="Flags are defined at the platform level; once they exist, you can pin any of them on or off for this tenant here."
+              className="py-12"
+            />
+          }
+        >
+          <ul className="divide-y">
+            {flags.map((flag) => (
+              <li key={flag.key} className="flex items-center gap-3 px-4 py-3">
+                <div className="min-w-0 flex-1">
+                  <div className="flex items-center gap-2">
+                    <code className="font-mono text-sm">{flag.key}</code>
+                    <BadgeCell
+                      label={flag.source === "override" ? "override" : "default"}
+                      tone={flag.source === "override" ? "info" : "default"}
+                    />
+                  </div>
+                  {flag.description ? (
+                    <p className="mt-0.5 truncate text-xs text-muted-foreground">
+                      {flag.description}
+                    </p>
+                  ) : null}
+                </div>
+
+                {flag.source === "override" ? (
+                  <Button
+                    variant="ghost"
+                    size="sm"
+                    onClick={() => revert(flag)}
+                    disabled={busy === flag.key}
+                    data-action={`tenant-detail-flags-revert-${flag.key}`}
+                    title="Revert to the platform default"
+                  >
+                    <RotateCcw className="size-4" />
+                    Revert
+                  </Button>
+                ) : null}
+
+                <Switch
+                  checked={flag.enabled}
+                  onCheckedChange={(v) => toggle(flag, v)}
+                  disabled={busy === flag.key}
+                  data-action={`tenant-detail-flags-toggle-${flag.key}`}
+                  aria-label={`Override ${flag.key}`}
+                />
+              </li>
+            ))}
+          </ul>
+        </DataState>
+      </CardContent>
+    </Card>
+  )
+}
diff --git a/app/components/tenant-detail/inbound-webhooks-tab.tsx b/app/components/tenant-detail/inbound-webhooks-tab.tsx
new file mode 100644
index 0000000..0f718cc
--- /dev/null
+++ b/app/components/tenant-detail/inbound-webhooks-tab.tsx
@@ -0,0 +1,534 @@
+import { useCallback, useEffect, useState } from "react"
+import { Clock, ListChecks, Plus, RefreshCw, Trash2 } from "lucide-react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
+import { BadgeCell, type BadgeTone } from "@crema/table-ui"
+
+import type { TenantTabProps } from "~/routes/tenants.$id"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
+import { Button } from "~/components/ui/button"
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "~/components/ui/card"
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "~/components/ui/dialog"
+import { Input } from "~/components/ui/input"
+import { Label } from "~/components/ui/label"
+import { Switch } from "~/components/ui/switch"
+import {
+  createInboundWebhook,
+  deleteInboundWebhook,
+  listInboundWebhookDeliveries,
+  listInboundWebhooks,
+  updateInboundWebhook,
+  type InboundWebhookDelivery,
+  type InboundWebhookSource,
+} from "~/lib/arcadia/tenants"
+
+/**
+ * Inbound webhook sources: external providers whose signed callbacks this
+ * tenant accepts and verifies. Each source can be toggled, deleted, and has a
+ * recent-deliveries log.
+ */
+export function InboundWebhooksTab({ tenant }: TenantTabProps) {
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+
+  const [sources, setSources] = useState<InboundWebhookSource[]>([])
+  const [loading, setLoading] = useState(true)
+  // Raw thrown value; DataState normalises it. A failed load must never render
+  // as "no sources yet".
+  const [error, setError] = useState<unknown>(null)
+  const [busy, setBusy] = useState<Set<string>>(new Set())
+  const [addOpen, setAddOpen] = useState(false)
+  const [deliveriesFor, setDeliveriesFor] = useState<InboundWebhookSource | null>(null)
+  const [pendingDelete, setPendingDelete] = useState<InboundWebhookSource | null>(null)
+
+  const load = useCallback(async () => {
+    setError(null)
+    setLoading(true)
+    try {
+      setSources(await listInboundWebhooks(arcadia, tenant.id))
+    } catch (err) {
+      setError(err)
+    } finally {
+      setLoading(false)
+    }
+  }, [arcadia, tenant.id])
+
+  useEffect(() => {
+    load()
+  }, [load])
+
+  const markBusy = (id: string, on: boolean) =>
+    setBusy((prev) => {
+      const next = new Set(prev)
+      if (on) next.add(id)
+      else next.delete(id)
+      return next
+    })
+
+  const toggle = useCallback(
+    async (src: InboundWebhookSource, next: boolean) => {
+      markBusy(src.id, true)
+      setSources((prev) =>
+        prev.map((s) => (s.id === src.id ? { ...s, enabled: next } : s)),
+      )
+      try {
+        const updated = await updateInboundWebhook(arcadia, tenant.id, src.id, {
+          enabled: next,
+        })
+        setSources((prev) => prev.map((s) => (s.id === updated.id ? updated : s)))
+        toast.success(`${next ? "Enabled" : "Disabled"} ${src.name}`)
+      } catch (err) {
+        setSources((prev) =>
+          prev.map((s) => (s.id === src.id ? { ...s, enabled: !next } : s)),
+        )
+        toast.error(errorMessage(err, `update ${src.name}`))
+      } finally {
+        markBusy(src.id, false)
+      }
+    },
+    [arcadia, tenant.id, toast],
+  )
+
+  return (
+    <Card>
+      <CardHeader className="flex flex-row items-start justify-between gap-4">
+        <div className="space-y-1">
+          <CardTitle>Inbound webhooks</CardTitle>
+          <CardDescription>
+            External providers whose signed callbacks {tenant.name} accepts and
+            verifies.
+          </CardDescription>
+        </div>
+        <div className="flex items-center gap-2">
+          <Button
+            variant="outline"
+            size="sm"
+            onClick={load}
+            disabled={loading}
+            data-action="tenant-detail-webhooks-refresh"
+          >
+            <RefreshCw className={`size-4 ${loading ? "animate-spin" : ""}`} />
+            Refresh
+          </Button>
+          <Button
+            size="sm"
+            onClick={() => setAddOpen(true)}
+            data-action="tenant-detail-webhooks-add"
+          >
+            <Plus className="size-4" />
+            Add source
+          </Button>
+        </div>
+      </CardHeader>
+
+      <CardContent className="relative p-0">
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={sources.length === 0}
+          onRetry={load}
+          loadingLabel="Loading webhook sources…"
+          empty={
+            <EmptyState
+              title="No inbound webhook sources."
+              description="Add one to accept and verify signed callbacks from an external provider."
+              className="py-12"
+            />
+          }
+        >
+          <div className="overflow-x-auto">
+            <table className="w-full text-sm">
+              <thead>
+                <tr className="border-b text-left text-xs uppercase tracking-wider text-muted-foreground">
+                  <th className="px-6 py-2 font-medium">Name</th>
+                  <th className="px-4 py-2 font-medium">Provider</th>
+                  <th className="px-4 py-2 font-medium">Enabled</th>
+                  <th className="px-6 py-2" />
+                </tr>
+              </thead>
+              <tbody className="divide-y">
+                {sources.map((src) => {
+                  const isBusy = busy.has(src.id)
+                  return (
+                    <tr key={src.id}>
+                      <td className="px-6 py-3 font-medium">{src.name}</td>
+                      <td className="px-4 py-3 text-muted-foreground">
+                        {src.provider || "—"}
+                      </td>
+                      <td className="px-4 py-3">
+                        <Switch
+                          checked={src.enabled}
+                          disabled={isBusy}
+                          onCheckedChange={(next) => toggle(src, next)}
+                          data-action={`tenant-detail-webhooks-toggle-${src.id}`}
+                        />
+                      </td>
+                      <td className="px-6 py-3">
+                        <div className="flex items-center justify-end gap-1">
+                          <Button
+                            variant="outline"
+                            size="sm"
+                            onClick={() => setDeliveriesFor(src)}
+                            data-action={`tenant-detail-webhooks-deliveries-${src.id}`}
+                          >
+                            <ListChecks className="size-4" />
+                            Deliveries
+                          </Button>
+                          <Button
+                            variant="ghost"
+                            size="icon-sm"
+                            className="text-destructive"
+                            disabled={isBusy}
+                            onClick={() => setPendingDelete(src)}
+                            aria-label={`Delete ${src.name}`}
+                            data-action={`tenant-detail-webhooks-delete-${src.id}`}
+                          >
+                            <Trash2 className="size-4" />
+                          </Button>
+                        </div>
+                      </td>
+                    </tr>
+                  )
+                })}
+              </tbody>
+            </table>
+          </div>
+        </DataState>
+      </CardContent>
+
+      <AddWebhookDialog
+        open={addOpen}
+        tenantId={tenant.id}
+        onClose={() => setAddOpen(false)}
+        onSaved={async (msg) => {
+          setAddOpen(false)
+          await load()
+          toast.success(msg)
+        }}
+      />
+
+      <DeliveriesDialog
+        source={deliveriesFor}
+        tenantId={tenant.id}
+        onClose={() => setDeliveriesFor(null)}
+      />
+
+      <ConfirmDialog
+        open={pendingDelete !== null}
+        onOpenChange={(o) => !o && setPendingDelete(null)}
+        title="Delete webhook source?"
+        description={
+          pendingDelete
+            ? `${pendingDelete.name} will be removed. Incoming callbacks from this provider will be rejected, and its delivery history is discarded.`
+            : ""
+        }
+        confirmLabel="Delete"
+        variant="danger"
+        onConfirm={async () => {
+          if (!pendingDelete) return
+          const target = pendingDelete
+          try {
+            await deleteInboundWebhook(arcadia, tenant.id, target.id)
+            setPendingDelete(null)
+            await load()
+            toast.success(`Deleted ${target.name}`)
+          } catch (err) {
+            setPendingDelete(null)
+            toast.error(errorMessage(err, `delete ${target.name}`))
+          }
+        }}
+      />
+    </Card>
+  )
+}
+
+function AddWebhookDialog({
+  open,
+  tenantId,
+  onClose,
+  onSaved,
+}: {
+  open: boolean
+  tenantId: string
+  onClose: () => void
+  onSaved: (message: string) => Promise<void>
+}) {
+  const arcadia = useArcadiaClient()
+  const [name, setName] = useState("")
+  const [provider, setProvider] = useState("")
+  const [signingSecret, setSigningSecret] = useState("")
+  const [signatureHeader, setSignatureHeader] = useState("")
+  const [signatureAlgorithm, setSignatureAlgorithm] = useState("hmac_sha256")
+  const [enabled, setEnabled] = useState(true)
+  const [saving, setSaving] = useState(false)
+  // Failed submit renders here, above the buttons, with the form intact.
+  const [error, setError] = useState<unknown>(null)
+
+  useEffect(() => {
+    if (!open) return
+    setName("")
+    setProvider("")
+    setSigningSecret("")
+    setSignatureHeader("")
+    setSignatureAlgorithm("hmac_sha256")
+    setEnabled(true)
+    setError(null)
+  }, [open])
+
+  const submit = async () => {
+    const trimmedName = name.trim()
+    setError(null)
+    setSaving(true)
+    try {
+      if (!trimmedName) throw new Error("A name is required.")
+      await createInboundWebhook(arcadia, tenantId, {
+        name: trimmedName,
+        provider: provider.trim() || undefined,
+        signing_secret: signingSecret || undefined,
+        signature_header: signatureHeader.trim() || undefined,
+        signature_algorithm: signatureAlgorithm.trim() || undefined,
+        enabled,
+      })
+      await onSaved(`Added webhook source ${trimmedName}`)
+    } catch (err) {
+      setError(err)
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={(o) => !o && onClose()}>
+      <DialogContent className="sm:max-w-lg max-h-[90vh] overflow-y-auto">
+        <DialogHeader>
+          <DialogTitle>Add webhook source</DialogTitle>
+          <DialogDescription>
+            Register an external provider whose signed callbacks this tenant will
+            accept and verify.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="flex flex-col gap-4">
+          <div className="flex flex-col gap-1.5">
+            <Label htmlFor="webhook-name">Name</Label>
+            <Input
+              id="webhook-name"
+              value={name}
+              onChange={(e) => setName(e.target.value)}
+              placeholder="Stripe events"
+              autoFocus
+              data-action="tenant-detail-webhooks-form-name"
+            />
+          </div>
+
+          <div className="flex flex-col gap-1.5">
+            <Label htmlFor="webhook-provider">Provider</Label>
+            <Input
+              id="webhook-provider"
+              value={provider}
+              onChange={(e) => setProvider(e.target.value)}
+              placeholder="stripe"
+              data-action="tenant-detail-webhooks-form-provider"
+            />
+          </div>
+
+          <div className="flex flex-col gap-1.5">
+            <Label htmlFor="webhook-secret">Signing secret</Label>
+            <Input
+              id="webhook-secret"
+              type="password"
+              value={signingSecret}
+              onChange={(e) => setSigningSecret(e.target.value)}
+              placeholder="whsec_…"
+              data-action="tenant-detail-webhooks-form-secret"
+            />
+            <p className="text-xs text-muted-foreground">
+              Stored encrypted; used to verify incoming signatures. Write-only.
+            </p>
+          </div>
+
+          <div className="grid grid-cols-2 gap-3">
+            <div className="flex flex-col gap-1.5">
+              <Label htmlFor="webhook-header">Signature header</Label>
+              <Input
+                id="webhook-header"
+                value={signatureHeader}
+                onChange={(e) => setSignatureHeader(e.target.value)}
+                placeholder="X-Signature"
+                className="font-mono"
+                data-action="tenant-detail-webhooks-form-header"
+              />
+            </div>
+            <div className="flex flex-col gap-1.5">
+              <Label htmlFor="webhook-algorithm">Signature algorithm</Label>
+              <Input
+                id="webhook-algorithm"
+                value={signatureAlgorithm}
+                onChange={(e) => setSignatureAlgorithm(e.target.value)}
+                placeholder="hmac_sha256"
+                className="font-mono"
+                data-action="tenant-detail-webhooks-form-algorithm"
+              />
+            </div>
+          </div>
+
+          <div className="flex items-center justify-between rounded-md border px-3 py-2">
+            <div>
+              <div className="text-sm font-medium">Enabled</div>
+              <div className="text-xs text-muted-foreground">
+                Disabled sources reject incoming callbacks.
+              </div>
+            </div>
+            <Switch
+              checked={enabled}
+              onCheckedChange={setEnabled}
+              data-action="tenant-detail-webhooks-form-enabled"
+            />
+          </div>
+        </div>
+
+        {error ? <DialogError error={error} context="add the source" /> : null}
+
+        <DialogFooter>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            disabled={saving}
+            data-action="tenant-detail-webhooks-form-cancel"
+          >
+            Cancel
+          </Button>
+          <Button
+            onClick={submit}
+            disabled={saving || !name.trim()}
+            data-action="tenant-detail-webhooks-form-save"
+          >
+            {saving ? <RefreshCw className="size-4 animate-spin" /> : null}
+            Add source
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
+
+function DeliveriesDialog({
+  source,
+  tenantId,
+  onClose,
+}: {
+  source: InboundWebhookSource | null
+  tenantId: string
+  onClose: () => void
+}) {
+  const arcadia = useArcadiaClient()
+  const [deliveries, setDeliveries] = useState<InboundWebhookDelivery[]>([])
+  const [loading, setLoading] = useState(true)
+  // A deliveries load that failed is not a source with no history. Own error
+  // state, rendered in place of the list.
+  const [error, setError] = useState<unknown>(null)
+  const [reloadKey, setReloadKey] = useState(0)
+
+  useEffect(() => {
+    if (!source) return
+    let mounted = true
+    setLoading(true)
+    setError(null)
+    listInboundWebhookDeliveries(arcadia, tenantId, source.id)
+      .then((rows) => {
+        if (mounted) setDeliveries(rows)
+      })
+      .catch((err) => {
+        if (mounted) setError(err)
+      })
+      .finally(() => {
+        if (mounted) setLoading(false)
+      })
+    return () => {
+      mounted = false
+    }
+  }, [arcadia, tenantId, source, reloadKey])
+
+  return (
+    <Dialog open={source !== null} onOpenChange={(o) => !o && onClose()}>
+      <DialogContent className="sm:max-w-lg">
+        <DialogHeader>
+          <DialogTitle>Deliveries{source ? ` — ${source.name}` : ""}</DialogTitle>
+          <DialogDescription>
+            Recent signed callbacks received from this provider.
+          </DialogDescription>
+        </DialogHeader>
+
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={deliveries.length === 0}
+          onRetry={() => setReloadKey((n) => n + 1)}
+          loadingLabel="Loading deliveries…"
+          empty={
+            <p className="py-8 text-center text-sm text-muted-foreground">
+              No deliveries yet. Callbacks this source receives and verifies will
+              appear here.
+            </p>
+          }
+        >
+          <ul className="flex max-h-[50vh] flex-col divide-y overflow-y-auto rounded-md border">
+            {deliveries.map((d) => {
+              const when = d.received_at ?? d.inserted_at
+              return (
+                <li
+                  key={d.id}
+                  className="flex items-center justify-between gap-3 px-3 py-2"
+                >
+                  <BadgeCell
+                    label={d.status ?? "unknown"}
+                    tone={deliveryTone(d.status)}
+                  />
+                  <span className="text-xs text-muted-foreground">
+                    <Clock className="mr-1 inline size-3" />
+                    {when ? new Date(when).toLocaleString() : "—"}
+                  </span>
+                </li>
+              )
+            })}
+          </ul>
+        </DataState>
+
+        <DialogFooter>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            data-action="tenant-detail-webhooks-deliveries-close"
+          >
+            Close
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
+
+function deliveryTone(status?: string): BadgeTone {
+  const s = (status ?? "").toLowerCase()
+  if (["ok", "success", "delivered", "verified", "processed"].includes(s))
+    return "success"
+  if (["failed", "error", "rejected", "invalid"].includes(s)) return "danger"
+  if (["pending", "retrying", "queued"].includes(s)) return "warning"
+  return "default"
+}
diff --git a/app/components/tenant-detail/ip-rules-tab.tsx b/app/components/tenant-detail/ip-rules-tab.tsx
new file mode 100644
index 0000000..2c6b08c
--- /dev/null
+++ b/app/components/tenant-detail/ip-rules-tab.tsx
@@ -0,0 +1,389 @@
+import { useCallback, useEffect, useState } from "react"
+import { Plus, RefreshCw, Trash2 } from "lucide-react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
+import { BadgeCell } from "@crema/table-ui"
+
+import type { TenantTabProps } from "~/routes/tenants.$id"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
+import { Button } from "~/components/ui/button"
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "~/components/ui/card"
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "~/components/ui/dialog"
+import { Input } from "~/components/ui/input"
+import { Label } from "~/components/ui/label"
+import { NativeSelect, NativeSelectOption } from "~/components/ui/native-select"
+import { Switch } from "~/components/ui/switch"
+import {
+  createIpRule,
+  deleteIpRule,
+  listIpRules,
+  updateIpRule,
+  type IpRule,
+} from "~/lib/arcadia/tenants"
+
+/**
+ * Per-tenant IP allow/deny rules. With no allow rules every IP is permitted;
+ * an allow rule locks access to known ranges, a deny rule blocks specific ones.
+ */
+export function IpRulesTab({ tenant }: TenantTabProps) {
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+
+  const [rules, setRules] = useState<IpRule[]>([])
+  const [loading, setLoading] = useState(true)
+  // Raw thrown value; DataState normalises it. A failed load must never render
+  // as "no rules — every IP allowed".
+  const [error, setError] = useState<unknown>(null)
+  const [busy, setBusy] = useState<Set<string>>(new Set())
+  const [addOpen, setAddOpen] = useState(false)
+  const [pendingDelete, setPendingDelete] = useState<IpRule | null>(null)
+
+  const load = useCallback(async () => {
+    setError(null)
+    setLoading(true)
+    try {
+      setRules(await listIpRules(arcadia, tenant.id))
+    } catch (err) {
+      setError(err)
+    } finally {
+      setLoading(false)
+    }
+  }, [arcadia, tenant.id])
+
+  useEffect(() => {
+    load()
+  }, [load])
+
+  const markBusy = (id: string, on: boolean) =>
+    setBusy((prev) => {
+      const next = new Set(prev)
+      if (on) next.add(id)
+      else next.delete(id)
+      return next
+    })
+
+  const toggle = useCallback(
+    async (rule: IpRule, next: boolean) => {
+      markBusy(rule.id, true)
+      setRules((prev) =>
+        prev.map((r) => (r.id === rule.id ? { ...r, enabled: next } : r)),
+      )
+      try {
+        const updated = await updateIpRule(arcadia, tenant.id, rule.id, {
+          enabled: next,
+        })
+        setRules((prev) => prev.map((r) => (r.id === updated.id ? updated : r)))
+        toast.success(
+          `${next ? "Enabled" : "Disabled"} ${rule.rule_type} rule ${rule.cidr}`,
+        )
+      } catch (err) {
+        setRules((prev) =>
+          prev.map((r) => (r.id === rule.id ? { ...r, enabled: !next } : r)),
+        )
+        toast.error(errorMessage(err, `update rule ${rule.cidr}`))
+      } finally {
+        markBusy(rule.id, false)
+      }
+    },
+    [arcadia, tenant.id, toast],
+  )
+
+  return (
+    <Card>
+      <CardHeader className="flex flex-row items-start justify-between gap-4">
+        <div className="space-y-1">
+          <CardTitle>IP rules</CardTitle>
+          <CardDescription>
+            Control which client IPs may reach {tenant.name}. With no allow
+            rules, every IP is allowed.
+          </CardDescription>
+        </div>
+        <div className="flex items-center gap-2">
+          <Button
+            variant="outline"
+            size="sm"
+            onClick={load}
+            disabled={loading}
+            data-action="tenant-detail-ip-refresh"
+          >
+            <RefreshCw className={`size-4 ${loading ? "animate-spin" : ""}`} />
+            Refresh
+          </Button>
+          <Button
+            size="sm"
+            onClick={() => setAddOpen(true)}
+            data-action="tenant-detail-ip-add"
+          >
+            <Plus className="size-4" />
+            Add rule
+          </Button>
+        </div>
+      </CardHeader>
+
+      <CardContent className="relative p-0">
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={rules.length === 0}
+          onRetry={load}
+          loadingLabel="Loading IP rules…"
+          empty={
+            <EmptyState
+              title="No IP rules."
+              description="With no allow rules, every IP is allowed; add a deny rule to block specific ranges, or an allow rule to lock access down to known ranges."
+              className="py-12"
+            />
+          }
+        >
+          <div className="overflow-x-auto">
+            <table className="w-full text-sm">
+              <thead>
+                <tr className="border-b text-left text-xs uppercase tracking-wider text-muted-foreground">
+                  <th className="px-6 py-2 font-medium">CIDR</th>
+                  <th className="px-4 py-2 font-medium">Type</th>
+                  <th className="px-4 py-2 font-medium">Description</th>
+                  <th className="px-4 py-2 font-medium">Enabled</th>
+                  <th className="px-6 py-2" />
+                </tr>
+              </thead>
+              <tbody className="divide-y">
+                {rules.map((rule) => {
+                  const isBusy = busy.has(rule.id)
+                  return (
+                    <tr key={rule.id}>
+                      <td className="px-6 py-3">
+                        <code className="font-mono text-xs">{rule.cidr}</code>
+                      </td>
+                      <td className="px-4 py-3">
+                        <BadgeCell
+                          label={rule.rule_type}
+                          tone={rule.rule_type === "deny" ? "danger" : "success"}
+                        />
+                      </td>
+                      <td className="px-4 py-3 text-muted-foreground">
+                        {rule.description || "—"}
+                      </td>
+                      <td className="px-4 py-3">
+                        <Switch
+                          checked={rule.enabled}
+                          disabled={isBusy}
+                          onCheckedChange={(next) => toggle(rule, next)}
+                          data-action={`tenant-detail-ip-toggle-${rule.id}`}
+                        />
+                      </td>
+                      <td className="px-6 py-3 text-right">
+                        <Button
+                          variant="ghost"
+                          size="icon-sm"
+                          className="text-destructive"
+                          disabled={isBusy}
+                          onClick={() => setPendingDelete(rule)}
+                          aria-label={`Delete rule ${rule.cidr}`}
+                          data-action={`tenant-detail-ip-delete-${rule.id}`}
+                        >
+                          <Trash2 className="size-4" />
+                        </Button>
+                      </td>
+                    </tr>
+                  )
+                })}
+              </tbody>
+            </table>
+          </div>
+        </DataState>
+      </CardContent>
+
+      <AddIpRuleDialog
+        open={addOpen}
+        tenantId={tenant.id}
+        onClose={() => setAddOpen(false)}
+        onSaved={async (msg) => {
+          setAddOpen(false)
+          await load()
+          toast.success(msg)
+        }}
+      />
+
+      <ConfirmDialog
+        open={pendingDelete !== null}
+        onOpenChange={(o) => !o && setPendingDelete(null)}
+        title="Delete IP rule?"
+        description={
+          pendingDelete
+            ? `The ${pendingDelete.rule_type} rule for ${pendingDelete.cidr} will be removed. If this was the last allow rule, every IP becomes allowed again.`
+            : ""
+        }
+        confirmLabel="Delete"
+        variant="danger"
+        onConfirm={async () => {
+          if (!pendingDelete) return
+          const target = pendingDelete
+          try {
+            await deleteIpRule(arcadia, tenant.id, target.id)
+            setPendingDelete(null)
+            await load()
+            toast.success(`Deleted ${target.rule_type} rule ${target.cidr}`)
+          } catch (err) {
+            setPendingDelete(null)
+            toast.error(errorMessage(err, `delete rule ${target.cidr}`))
+          }
+        }}
+      />
+    </Card>
+  )
+}
+
+function AddIpRuleDialog({
+  open,
+  tenantId,
+  onClose,
+  onSaved,
+}: {
+  open: boolean
+  tenantId: string
+  onClose: () => void
+  onSaved: (message: string) => Promise<void>
+}) {
+  const arcadia = useArcadiaClient()
+  const [cidr, setCidr] = useState("")
+  const [ruleType, setRuleType] = useState<"allow" | "deny">("allow")
+  const [description, setDescription] = useState("")
+  const [enabled, setEnabled] = useState(true)
+  const [saving, setSaving] = useState(false)
+  // Failed submit renders here, above the buttons, form kept intact.
+  const [error, setError] = useState<unknown>(null)
+
+  useEffect(() => {
+    if (!open) return
+    setCidr("")
+    setRuleType("allow")
+    setDescription("")
+    setEnabled(true)
+    setError(null)
+  }, [open])
+
+  const submit = async () => {
+    const trimmed = cidr.trim()
+    setError(null)
+    setSaving(true)
+    try {
+      if (!trimmed) throw new Error("A CIDR range is required.")
+      await createIpRule(arcadia, tenantId, {
+        cidr: trimmed,
+        rule_type: ruleType,
+        description: description.trim() || undefined,
+        enabled,
+      })
+      await onSaved(`Added ${ruleType} rule ${trimmed}`)
+    } catch (err) {
+      setError(err)
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={(o) => !o && onClose()}>
+      <DialogContent className="sm:max-w-md">
+        <DialogHeader>
+          <DialogTitle>Add IP rule</DialogTitle>
+          <DialogDescription>
+            Allow rules lock access to known ranges; deny rules block specific
+            ones.
+          </DialogDescription>
+        </DialogHeader>
+
+        <div className="flex flex-col gap-4">
+          <div className="flex flex-col gap-1.5">
+            <Label htmlFor="ip-cidr">CIDR range</Label>
+            <Input
+              id="ip-cidr"
+              value={cidr}
+              onChange={(e) => setCidr(e.target.value)}
+              placeholder="203.0.113.0/24"
+              className="font-mono"
+              autoFocus
+              data-action="tenant-detail-ip-form-cidr"
+            />
+          </div>
+
+          <div className="flex flex-col gap-1.5">
+            <Label htmlFor="ip-type">Rule type</Label>
+            <NativeSelect
+              id="ip-type"
+              className="w-full"
+              value={ruleType}
+              onChange={(e) => setRuleType(e.target.value as "allow" | "deny")}
+              data-action="tenant-detail-ip-form-type"
+            >
+              <NativeSelectOption value="allow">Allow</NativeSelectOption>
+              <NativeSelectOption value="deny">Deny</NativeSelectOption>
+            </NativeSelect>
+          </div>
+
+          <div className="flex flex-col gap-1.5">
+            <Label htmlFor="ip-description">Description</Label>
+            <Input
+              id="ip-description"
+              value={description}
+              onChange={(e) => setDescription(e.target.value)}
+              placeholder="Office VPN egress"
+              data-action="tenant-detail-ip-form-description"
+            />
+          </div>
+
+          <div className="flex items-center justify-between rounded-md border px-3 py-2">
+            <div>
+              <div className="text-sm font-medium">Enabled</div>
+              <div className="text-xs text-muted-foreground">
+                Disabled rules are kept but not enforced.
+              </div>
+            </div>
+            <Switch
+              checked={enabled}
+              onCheckedChange={setEnabled}
+              data-action="tenant-detail-ip-form-enabled"
+            />
+          </div>
+        </div>
+
+        {error ? <DialogError error={error} context="add the rule" /> : null}
+
+        <DialogFooter>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            disabled={saving}
+            data-action="tenant-detail-ip-form-cancel"
+          >
+            Cancel
+          </Button>
+          <Button
+            onClick={submit}
+            disabled={saving || !cidr.trim()}
+            data-action="tenant-detail-ip-form-save"
+          >
+            {saving ? <RefreshCw className="size-4 animate-spin" /> : null}
+            Add rule
+          </Button>
+        </DialogFooter>
+      </DialogContent>
+    </Dialog>
+  )
+}
diff --git a/app/components/tenant-detail/localization-tab.tsx b/app/components/tenant-detail/localization-tab.tsx
new file mode 100644
index 0000000..9d07c71
--- /dev/null
+++ b/app/components/tenant-detail/localization-tab.tsx
@@ -0,0 +1,114 @@
+import { useState } from "react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+
+import { TenantSection, Field } from "~/components/tenant-detail/section"
+import { NativeSelect, NativeSelectOption } from "~/components/ui/native-select"
+import {
+  updateLocalization,
+  TENANT_LOCALES,
+  TENANT_CURRENCIES,
+  COMMON_TIMEZONES,
+} from "~/lib/arcadia/tenants"
+import type { TenantTabProps } from "~/routes/tenants.$id"
+
+export function LocalizationTab({ tenant, reload }: TenantTabProps) {
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+
+  const current = tenant.localization
+  const [locale, setLocale] = useState(current?.locale ?? "")
+  const [timezone, setTimezone] = useState(current?.timezone ?? "")
+  const [currency, setCurrency] = useState(current?.currency ?? "")
+  const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
+
+  // The tenant's real timezone might be an IANA name outside our curated list —
+  // prepend it so the select shows the current value instead of silently
+  // snapping to the first option.
+  const timezoneOptions =
+    current?.timezone && !COMMON_TIMEZONES.includes(current.timezone)
+      ? [current.timezone, ...COMMON_TIMEZONES]
+      : COMMON_TIMEZONES
+
+  const dirty =
+    locale !== (current?.locale ?? "") ||
+    timezone !== (current?.timezone ?? "") ||
+    currency !== (current?.currency ?? "")
+
+  const save = async () => {
+    setSaving(true)
+    setError(null)
+    try {
+      await updateLocalization(arcadia, tenant.id, { locale, timezone, currency })
+      await reload()
+      toast.success("Localization updated")
+    } catch (err) {
+      setError(err)
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  return (
+    <TenantSection
+      title="Localization"
+      description="Default locale, timezone, and currency for this tenant."
+      onSubmit={save}
+      saving={saving}
+      error={error}
+      errorContext="update localization"
+      dirty={dirty}
+      dataAction="tenant-detail-localization-save"
+    >
+      <Field label="Locale" htmlFor="tenant-detail-localization-locale">
+        <NativeSelect
+          id="tenant-detail-localization-locale"
+          className="w-full"
+          value={locale}
+          onChange={(e) => setLocale(e.target.value)}
+          data-action="tenant-detail-localization-locale"
+        >
+          {TENANT_LOCALES.map((l) => (
+            <NativeSelectOption key={l} value={l}>
+              {l}
+            </NativeSelectOption>
+          ))}
+        </NativeSelect>
+      </Field>
+
+      <Field label="Currency" htmlFor="tenant-detail-localization-currency">
+        <NativeSelect
+          id="tenant-detail-localization-currency"
+          className="w-full"
+          value={currency}
+          onChange={(e) => setCurrency(e.target.value)}
+          data-action="tenant-detail-localization-currency"
+        >
+          {TENANT_CURRENCIES.map((c) => (
+            <NativeSelectOption key={c} value={c}>
+              {c}
+            </NativeSelectOption>
+          ))}
+        </NativeSelect>
+      </Field>
+
+      <Field label="Timezone" htmlFor="tenant-detail-localization-timezone">
+        <NativeSelect
+          id="tenant-detail-localization-timezone"
+          className="w-full"
+          value={timezone}
+          onChange={(e) => setTimezone(e.target.value)}
+          data-action="tenant-detail-localization-timezone"
+        >
+          {timezoneOptions.map((tz) => (
+            <NativeSelectOption key={tz} value={tz}>
+              {tz}
+            </NativeSelectOption>
+          ))}
+        </NativeSelect>
+      </Field>
+    </TenantSection>
+  )
+}
diff --git a/app/components/tenant-detail/plan-tab.tsx b/app/components/tenant-detail/plan-tab.tsx
new file mode 100644
index 0000000..83d9461
--- /dev/null
+++ b/app/components/tenant-detail/plan-tab.tsx
@@ -0,0 +1,279 @@
+import { useEffect, useState } from "react"
+import { Plus, X } from "lucide-react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+
+import { TenantSection, Field } from "~/components/tenant-detail/section"
+import { DataState } from "~/components/data-state"
+import { Button } from "~/components/ui/button"
+import { Input } from "~/components/ui/input"
+import { NativeSelect, NativeSelectOption } from "~/components/ui/native-select"
+import { Card, CardContent, CardHeader, CardTitle } from "~/components/ui/card"
+import {
+  listUsage,
+  updatePlan,
+  TENANT_PLANS,
+  type UsageRow,
+} from "~/lib/arcadia/tenants"
+import type { TenantTabProps } from "~/routes/tenants.$id"
+
+// One editable limit row. `locked` marks a key that already existed on the
+// tenant (its name is fixed — you edit the value or remove the row); new rows
+// added with "Add limit" have an editable key.
+type LimitRow = { id: number; key: string; value: string; locked: boolean }
+
+let rowSeq = 0
+const nextRowId = () => ++rowSeq
+
+function rowsFromLimits(limits: Record<string, unknown> | undefined): LimitRow[] {
+  return Object.entries(limits ?? {}).map(([key, value]) => ({
+    id: nextRowId(),
+    key,
+    value: String(value ?? ""),
+    locked: true,
+  }))
+}
+
+// Collapse the editable rows into the Record<string, number> the server wants.
+// Blank keys are dropped; non-numeric values coerce to 0 (Number("") === 0 too).
+function buildLimits(rows: LimitRow[]): Record<string, number> {
+  const out: Record<string, number> = {}
+  for (const row of rows) {
+    const key = row.key.trim()
+    if (!key) continue
+    out[key] = Number(row.value)
+  }
+  return out
+}
+
+function normaliseLimits(limits: Record<string, unknown> | undefined): Record<string, number> {
+  const out: Record<string, number> = {}
+  for (const [key, value] of Object.entries(limits ?? {})) out[key] = Number(value)
+  return out
+}
+
+export function PlanTab({ tenant, reload }: TenantTabProps) {
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+
+  const currentPlan = tenant.plan?.name ?? ""
+  const [plan, setPlan] = useState(currentPlan || TENANT_PLANS[0])
+  const [rows, setRows] = useState<LimitRow[]>(() => rowsFromLimits(tenant.plan?.limits))
+  const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
+
+  const originalLimits = normaliseLimits(tenant.plan?.limits)
+  const dirty =
+    plan !== currentPlan ||
+    JSON.stringify(buildLimits(rows)) !== JSON.stringify(originalLimits)
+
+  const setRowKey = (id: number, key: string) =>
+    setRows((rs) => rs.map((r) => (r.id === id ? { ...r, key } : r)))
+  const setRowValue = (id: number, value: string) =>
+    setRows((rs) => rs.map((r) => (r.id === id ? { ...r, value } : r)))
+  const removeRow = (id: number) => setRows((rs) => rs.filter((r) => r.id !== id))
+  const addRow = () =>
+    setRows((rs) => [...rs, { id: nextRowId(), key: "", value: "", locked: false }])
+
+  const save = async () => {
+    setSaving(true)
+    setError(null)
+    try {
+      await updatePlan(arcadia, tenant.id, {
+        plan,
+        plan_limits: buildLimits(rows),
+      })
+      await reload()
+      toast.success("Plan updated")
+    } catch (err) {
+      setError(err)
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  return (
+    <div className="flex flex-col gap-6">
+      <TenantSection
+        title="Plan"
+        description="The tenant's plan and its quota limits are saved together. The plan slug must be one the server recognises."
+        onSubmit={save}
+        saving={saving}
+        error={error}
+        errorContext="update the plan"
+        dirty={dirty}
+        dataAction="tenant-detail-plan-save"
+      >
+        <Field label="Plan" htmlFor="tenant-detail-plan-select">
+          <NativeSelect
+            id="tenant-detail-plan-select"
+            className="w-full"
+            value={plan}
+            onChange={(e) => setPlan(e.target.value)}
+            data-action="tenant-detail-plan-select"
+          >
+            {TENANT_PLANS.map((p) => (
+              <NativeSelectOption key={p} value={p}>
+                {p}
+              </NativeSelectOption>
+            ))}
+          </NativeSelect>
+        </Field>
+
+        <Field
+          label="Plan limits"
+          hint="Numeric quotas attached to this plan (e.g. users, storage_gb). Saved with the plan above."
+        >
+          <div className="flex flex-col gap-2">
+            {rows.length === 0 ? (
+              <p className="text-sm text-muted-foreground">No limits set.</p>
+            ) : (
+              rows.map((row) => (
+                <div key={row.id} className="flex items-center gap-2">
+                  <Input
+                    className="flex-1"
+                    placeholder="key"
+                    value={row.key}
+                    readOnly={row.locked}
+                    disabled={row.locked}
+                    onChange={(e) => setRowKey(row.id, e.target.value)}
+                    aria-label="Limit key"
+                    data-action="tenant-detail-plan-limit-key"
+                  />
+                  <Input
+                    className="w-32"
+                    type="number"
+                    inputMode="numeric"
+                    placeholder="value"
+                    value={row.value}
+                    onChange={(e) => setRowValue(row.id, e.target.value)}
+                    aria-label="Limit value"
+                    data-action="tenant-detail-plan-limit-value"
+                  />
+                  <Button
+                    type="button"
+                    variant="ghost"
+                    size="icon-sm"
+                    onClick={() => removeRow(row.id)}
+                    aria-label="Remove limit"
+                    data-action="tenant-detail-plan-limit-remove"
+                  >
+                    <X className="size-4" />
+                  </Button>
+                </div>
+              ))
+            )}
+
+            <div>
+              <Button
+                type="button"
+                variant="outline"
+                size="sm"
+                onClick={addRow}
+                data-action="tenant-detail-plan-limit-add"
+              >
+                <Plus className="size-4" />
+                Add limit
+              </Button>
+            </div>
+          </div>
+        </Field>
+      </TenantSection>
+
+      <PlanUsage tenantId={tenant.id} />
+    </div>
+  )
+}
+
+// Read-only usage-vs-quota panel. Loads independently so a metering failure
+// never blanks the plan form above it.
+function PlanUsage({ tenantId }: { tenantId: string }) {
+  const arcadia = useArcadiaClient()
+  const [rows, setRows] = useState<UsageRow[]>([])
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<unknown>(null)
+
+  const load = async () => {
+    setError(null)
+    setLoading(true)
+    try {
+      setRows(await listUsage(arcadia, tenantId))
+    } catch (err) {
+      setError(err)
+    } finally {
+      setLoading(false)
+    }
+  }
+
+  useEffect(() => {
+    load()
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [tenantId])
+
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>Usage</CardTitle>
+      </CardHeader>
+      <CardContent>
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={rows.length === 0}
+          onRetry={load}
+          loadingLabel="Loading usage…"
+          empty={
+            <div className="py-6 text-center text-sm text-muted-foreground">
+              No metered usage yet.
+            </div>
+          }
+        >
+          <ul className="flex flex-col divide-y divide-border">
+            {rows.map((row) => (
+              <li key={row.category} className="flex flex-col gap-1 py-3 first:pt-0 last:pb-0">
+                <div className="font-medium capitalize">{row.category}</div>
+                <div className="grid gap-1 text-sm text-muted-foreground sm:grid-cols-3">
+                  <UsageMeter
+                    label="This minute"
+                    used={row.usage.minute}
+                    limit={row.quota.enabled ? row.quota.calls_per_minute : null}
+                  />
+                  <UsageMeter
+                    label="Today"
+                    used={row.usage.day}
+                    limit={row.quota.enabled ? row.quota.calls_per_day : null}
+                  />
+                  <UsageMeter
+                    label="This month"
+                    used={row.usage.month}
+                    limit={row.quota.enabled ? row.quota.calls_per_month : null}
+                  />
+                </div>
+              </li>
+            ))}
+          </ul>
+        </DataState>
+      </CardContent>
+    </Card>
+  )
+}
+
+function UsageMeter({
+  label,
+  used,
+  limit,
+}: {
+  label: string
+  used: number
+  limit: number | null
+}) {
+  return (
+    <div>
+      <span className="text-xs uppercase tracking-wider">{label}</span>
+      <div className="text-foreground">
+        {used} {limit != null ? `/ ${limit}` : "/ no limit"}
+      </div>
+    </div>
+  )
+}
diff --git a/app/components/tenant-detail/section.tsx b/app/components/tenant-detail/section.tsx
new file mode 100644
index 0000000..595d073
--- /dev/null
+++ b/app/components/tenant-detail/section.tsx
@@ -0,0 +1,97 @@
+import type { ReactNode } from "react"
+
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "~/components/ui/card"
+import { Button } from "~/components/ui/button"
+import { DialogError } from "~/components/data-state"
+
+/**
+ * The shared frame every tenant-detail settings tab renders through: a titled
+ * card whose footer holds a Save button and, on failure, an inline error in the
+ * same place (never a page-level banner). Keeps the eight tabs visually and
+ * behaviourally identical so the operator learns the surface once.
+ */
+export function TenantSection({
+  title,
+  description,
+  children,
+  onSubmit,
+  saving,
+  error,
+  errorContext,
+  saveLabel = "Save changes",
+  dirty = true,
+  dataAction,
+  footerExtra,
+}: {
+  title: string
+  description?: ReactNode
+  children: ReactNode
+  onSubmit: () => void
+  saving: boolean
+  error: unknown
+  errorContext: string
+  saveLabel?: string
+  /** Disable Save until something changed. Defaults to always-enabled. */
+  dirty?: boolean
+  dataAction: string
+  /** Rendered to the left of Save (e.g. a "Send test" or "Remove" button). */
+  footerExtra?: ReactNode
+}) {
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>{title}</CardTitle>
+        {description ? <CardDescription>{description}</CardDescription> : null}
+      </CardHeader>
+      <CardContent>
+        <form
+          onSubmit={(e) => {
+            e.preventDefault()
+            onSubmit()
+          }}
+          className="flex flex-col gap-5"
+        >
+          {children}
+
+          {error ? <DialogError error={error} context={errorContext} /> : null}
+
+          <div className="flex items-center justify-between gap-2 pt-1">
+            <div>{footerExtra}</div>
+            <Button type="submit" disabled={saving || !dirty} data-action={dataAction}>
+              {saving ? "Saving…" : saveLabel}
+            </Button>
+          </div>
+        </form>
+      </CardContent>
+    </Card>
+  )
+}
+
+/** A labelled form row — label, control, and an optional hint underneath. */
+export function Field({
+  label,
+  htmlFor,
+  hint,
+  children,
+}: {
+  label: string
+  htmlFor?: string
+  hint?: ReactNode
+  children: ReactNode
+}) {
+  return (
+    <div className="flex flex-col gap-1.5">
+      <label htmlFor={htmlFor} className="text-sm font-medium">
+        {label}
+      </label>
+      {children}
+      {hint ? <p className="text-xs text-muted-foreground">{hint}</p> : null}
+    </div>
+  )
+}
diff --git a/app/components/ui/alert-dialog.test.tsx b/app/components/ui/alert-dialog.test.tsx
new file mode 100644
index 0000000..204e709
--- /dev/null
+++ b/app/components/ui/alert-dialog.test.tsx
@@ -0,0 +1,67 @@
+// Confirming an AlertDialog must close it AND run the action.
+//
+// AlertDialogAction used to be a plain <Button>, so the dialog just sat there
+// after you confirmed ("Clear conversation" cleared the chat and left the modal
+// on screen). Other call sites only looked right because the row they acted on
+// unmounted underneath the open dialog. Both halves are asserted here so a
+// future refactor can't quietly drop one.
+
+import { act } from "react"
+import { render, screen } from "@testing-library/react"
+import { afterEach, describe, expect, it, vi } from "vitest"
+
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+} from "./alert-dialog"
+
+function Harness({ onConfirm }: { onConfirm: () => void }) {
+  return (
+    <AlertDialog defaultOpen>
+      <AlertDialogContent>
+        <AlertDialogHeader>
+          <AlertDialogTitle>Clear this conversation?</AlertDialogTitle>
+        </AlertDialogHeader>
+        <AlertDialogFooter>
+          <AlertDialogCancel>Keep it</AlertDialogCancel>
+          <AlertDialogAction onClick={onConfirm}>Clear</AlertDialogAction>
+        </AlertDialogFooter>
+      </AlertDialogContent>
+    </AlertDialog>
+  )
+}
+
+afterEach(() => vi.restoreAllMocks())
+
+describe("AlertDialogAction", () => {
+  it("runs the action and closes the dialog", async () => {
+    const onConfirm = vi.fn()
+    render(<Harness onConfirm={onConfirm} />)
+
+    expect(screen.getByText("Clear this conversation?")).toBeTruthy()
+
+    await act(async () => {
+      screen.getByRole("button", { name: "Clear" }).click()
+    })
+
+    expect(onConfirm).toHaveBeenCalledTimes(1)
+    expect(screen.queryByText("Clear this conversation?")).toBeNull()
+  })
+
+  it("cancelling closes without running the action", async () => {
+    const onConfirm = vi.fn()
+    render(<Harness onConfirm={onConfirm} />)
+
+    await act(async () => {
+      screen.getByRole("button", { name: "Keep it" }).click()
+    })
+
+    expect(onConfirm).not.toHaveBeenCalled()
+    expect(screen.queryByText("Clear this conversation?")).toBeNull()
+  })
+})
diff --git a/app/components/ui/alert-dialog.tsx b/app/components/ui/alert-dialog.tsx
index 600d38d..19ea595 100644
--- a/app/components/ui/alert-dialog.tsx
+++ b/app/components/ui/alert-dialog.tsx
@@ -141,14 +141,24 @@ function AlertDialogDescription({
   )
 }
 
+// Confirming closes the dialog, exactly as cancelling does. This was a plain
+// <Button>, so the dialog stayed open after you confirmed — every call site
+// already assumed otherwise, and the ones that looked fine only did because
+// the thing they acted on (a row, a card) unmounted underneath them. The
+// handler still runs: Base UI merges its close handler with the caller's
+// onClick, so async work carries on behind the closed dialog.
 function AlertDialogAction({
   className,
+  variant = "default",
+  size = "default",
   ...props
-}: React.ComponentProps<typeof Button>) {
+}: AlertDialogPrimitive.Close.Props &
+  Pick<React.ComponentProps<typeof Button>, "variant" | "size">) {
   return (
-    <Button
+    <AlertDialogPrimitive.Close
       data-slot="alert-dialog-action"
       className={cn(className)}
+      render={<Button variant={variant} size={size} />}
       {...props}
     />
   )
diff --git a/app/components/users/user-detail-sheet.tsx b/app/components/users/user-detail-sheet.tsx
index ccd326c..fd18118 100644
--- a/app/components/users/user-detail-sheet.tsx
+++ b/app/components/users/user-detail-sheet.tsx
@@ -15,7 +15,7 @@ import {
   X,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-core-client"
 import { AlertBanner, ConfirmDialog } from "@crema/feedback-ui"
 
 import { Badge } from "~/components/ui/badge"
diff --git a/app/lib/admin-tools.ts b/app/lib/admin-tools.ts
index 98f87bf..e8324ed 100644
--- a/app/lib/admin-tools.ts
+++ b/app/lib/admin-tools.ts
@@ -5,7 +5,7 @@
 // Each tool is a named function with documented args. The LLM never sees
 // raw HTTP — only the menu below.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 import {
   createToolRuntime,
   type ToolDef,
@@ -53,7 +53,7 @@ const docsClient = createRAGClient("/docs-index.json")
 //      tooling and wire it through `.env.local`.
 //   3. operator session JWT — works only when arcadia-search shares the
 //      JWT signing secret with the arcadia issuing the operator's session
-//      (i.e. local arcadia-app + local arcadia-search with matching keys).
+//      (i.e. local arcadia-core + local arcadia-search with matching keys).
 //   4. "dev" literal — only accepted by AUTH_MODE=dev backends.
 function readEnv(key: string): string | undefined {
   if (typeof import.meta === "undefined") return undefined
@@ -667,7 +667,7 @@ const TOOLS: ToolDef<ToolCtx>[] = [
   {
     name: "search_docs",
     description:
-      "Search the arcadia-app documentation (architecture, API surface, deploy/setup guides) for passages relevant to a question. Use this for conceptual or procedural questions where the live API tools won't help — e.g. 'how does multi-tenant isolation work', 'how do I deploy to production', 'what is the modular monolith pattern'. Returns up to `limit` ranked passages with title, sourcePath, and excerpt. Cite results by sourcePath in your reply.",
+      "Search the arcadia-core documentation (architecture, API surface, deploy/setup guides) for passages relevant to a question. Use this for conceptual or procedural questions where the live API tools won't help — e.g. 'how does multi-tenant isolation work', 'how do I deploy to production', 'what is the modular monolith pattern'. Returns up to `limit` ranked passages with title, sourcePath, and excerpt. Cite results by sourcePath in your reply.",
     parameters: {
       type: "object",
       properties: {
@@ -715,7 +715,7 @@ const TOOLS: ToolDef<ToolCtx>[] = [
   {
     name: "search_kb",
     description:
-      "Lexical (BM25) search over the arcadia-search Tantivy backend. Returns chunks with snippets + chunk_ids that can be passed to `read_chunk` to expand. Prefer this over `search_docs` (browser) when you need richer hits or when the content wouldn't be in the bundled docs.\n\nKnown corpora on the platform-admin tenant:\n- `docs` — arcadia-app architecture/ops docs (same as the browser RAG, server-hosted for parity).\n- `operator-tools` — arcadia-search + arcadia-admin documentation (admin sidecar, deploy script, search admin UI, MULTI_TENANT, RAG, AI_FIRST, LIBS, LLM_PROXY_CONTRACT).\n- `files` — markdown/text files uploaded by tenant users via arcadia-app.\n\nIf you're not sure what's available, call `list_search_corpora` first. Operators can add new corpora via the `/search` route.",
+      "Lexical (BM25) search over the arcadia-search Tantivy backend. Returns chunks with snippets + chunk_ids that can be passed to `read_chunk` to expand. Prefer this over `search_docs` (browser) when you need richer hits or when the content wouldn't be in the bundled docs.\n\nKnown corpora on the platform-admin tenant:\n- `docs` — arcadia-core architecture/ops docs (same as the browser RAG, server-hosted for parity).\n- `operator-tools` — arcadia-search + arcadia-admin documentation (admin sidecar, deploy script, search admin UI, MULTI_TENANT, RAG, AI_FIRST, LIBS, LLM_PROXY_CONTRACT).\n- `files` — markdown/text files uploaded by tenant users via arcadia-core.\n\nIf you're not sure what's available, call `list_search_corpora` first. Operators can add new corpora via the `/search` route.",
     parameters: {
       type: "object",
       properties: {
diff --git a/app/lib/arcadia-knowledge.ts b/app/lib/arcadia-knowledge.ts
index e193cb7..037e196 100644
--- a/app/lib/arcadia-knowledge.ts
+++ b/app/lib/arcadia-knowledge.ts
@@ -1,5 +1,5 @@
 // Domain primer baked into the assistant's system prompt so it understands
-// what arcadia-app is, what platform admins do, and how the data model fits
+// what arcadia-core is, what platform admins do, and how the data model fits
 // together. Keep this tight — it costs context tokens on every turn.
 
 export const ARCADIA_KNOWLEDGE = `Arcadia (the backend you administer):
@@ -31,7 +31,7 @@ Things to keep in mind when assisting:
 - Writes are auditable. Suggest the user double-check tenant slug and impact before suspend/deactivate. Deactivate is harsher than suspend — only use when clearly intended.
 - The operator can impersonate tenant users for debugging (POST /api/v1/admin/impersonate/:user_id) — surface this when they ask "why can't user X log in".
 - Quotas / rate cards / billing config errors usually surface as 402/403 from /api/v1 endpoints — diagnose by checking the tenant's billing-config and api-metering quotas.
-- The reference Phoenix app lives at \`reference/arcadia-app/\` in the workspace; its OpenAPI spec is at /api/openapi (sync via \`node ../lib-arcadia-client/scripts/sync-spec.mjs\`).
+- The reference Phoenix app lives at \`reference/arcadia-core/\` in the workspace; its OpenAPI spec is at /api/openapi (sync via \`node ../lib-arcadia-core-client/scripts/sync-spec.mjs\`).
 - Search admin (arcadia-search) is a separate service. Manage tenants/corpora at \`/search\`. Use \`list_search_corpora\` if you don't know what's indexed; \`rebuild_search_corpus\` after uploads or when results look stale; \`search_kb\` / \`read_chunk\` to query.
 
 When the user asks something that maps to a tool, call it. When they ask about a concept, explain it from this primer in plain language. Write tools (suspend_tenant, activate_tenant) prompt the operator with an inline confirm card before they actually run — you do not need to ask in prose first; just call the tool and the user will see the confirmation UI. If the user denies a write, do not retry it; ask what they'd like to do differently.
diff --git a/app/lib/arcadia/announcements.ts b/app/lib/arcadia/announcements.ts
index 8761220..9e43555 100644
--- a/app/lib/arcadia/announcements.ts
+++ b/app/lib/arcadia/announcements.ts
@@ -1,7 +1,7 @@
 // Platform announcements helpers.
 // Backend: /api/v1/admin/announcements (admin CRUD).
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type AnnouncementType =
   | "info"
diff --git a/app/lib/arcadia/api-keys.ts b/app/lib/arcadia/api-keys.ts
index 05be977..e4cccab 100644
--- a/app/lib/arcadia/api-keys.ts
+++ b/app/lib/arcadia/api-keys.ts
@@ -4,7 +4,7 @@
 // once — list/show endpoints only return the prefix. Callers must surface
 // the value to the user immediately on create.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export interface ApiKey {
   id: string
diff --git a/app/lib/arcadia/audit-logs.ts b/app/lib/arcadia/audit-logs.ts
index 51915a1..213fe3b 100644
--- a/app/lib/arcadia/audit-logs.ts
+++ b/app/lib/arcadia/audit-logs.ts
@@ -1,7 +1,7 @@
 // Audit log + observability helpers.
 // All endpoints are read-only; the backend writes audit events itself.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type AuditSeverity = "info" | "warning" | "error" | "critical" | string
 
diff --git a/app/lib/arcadia/billing.ts b/app/lib/arcadia/billing.ts
new file mode 100644
index 0000000..ef5e42e
--- /dev/null
+++ b/app/lib/arcadia/billing.ts
@@ -0,0 +1,26 @@
+// Billing — the plan catalogue (what plans tenants can be on). Per-tenant plan
+// assignment lives on the tenant detail page; this is the platform-level view
+// of what's on offer. Backend: /api/v1/billing/plans.
+
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
+
+export interface PlanMeter {
+  meter_key: string
+  included_units: number | null
+  overage_price_cents: number | null
+}
+
+export interface Plan {
+  name: string
+  slug: string
+  description: string | null
+  meters: PlanMeter[]
+  pricing: unknown[]
+  billing_track: string
+  trial_days: number
+}
+
+export async function listPlans(arcadia: ArcadiaClient): Promise<Plan[]> {
+  const res = await arcadia.GET<{ data: Plan[] }>("/api/v1/billing/plans")
+  return res.data
+}
diff --git a/app/lib/arcadia/buckets.ts b/app/lib/arcadia/buckets.ts
index f6bf877..c9e4268 100644
--- a/app/lib/arcadia/buckets.ts
+++ b/app/lib/arcadia/buckets.ts
@@ -2,7 +2,7 @@
 // Backend: /api/v1/platform/buckets/*. All operations require a
 // storage_config_id pointing at a credential row in /api/v1/storage_configs.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export interface Bucket {
   name: string
diff --git a/app/lib/arcadia/digital-objects.ts b/app/lib/arcadia/digital-objects.ts
index 014fc51..a97bb63 100644
--- a/app/lib/arcadia/digital-objects.ts
+++ b/app/lib/arcadia/digital-objects.ts
@@ -2,7 +2,7 @@
 // used by the avatar uploader. The full digital-objects API is much
 // larger; add endpoints here as we wire more features.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export interface DigitalObject {
   id: string
diff --git a/app/lib/arcadia/feature-flags.ts b/app/lib/arcadia/feature-flags.ts
new file mode 100644
index 0000000..92133a3
--- /dev/null
+++ b/app/lib/arcadia/feature-flags.ts
@@ -0,0 +1,51 @@
+// Platform-wide feature flags — the registry of flags that exist across the
+// whole deployment. A tenant then overrides any of these under its detail page
+// (see tenant-detail/feature-flags-tab). Backend: /api/v1/admin/feature-flags
+// (platform_admin only).
+
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
+
+export interface PlatformFlag {
+  id: string
+  key: string
+  description: string | null
+  enabled_by_default: boolean
+  inserted_at?: string
+  updated_at?: string
+}
+
+export type PlatformFlagInput = {
+  key?: string
+  description?: string | null
+  enabled_by_default?: boolean
+}
+
+export async function listPlatformFlags(arcadia: ArcadiaClient): Promise<PlatformFlag[]> {
+  const res = await arcadia.GET<{ data: PlatformFlag[] }>("/api/v1/admin/feature-flags")
+  return res.data
+}
+
+export async function createPlatformFlag(
+  arcadia: ArcadiaClient,
+  input: PlatformFlagInput,
+): Promise<PlatformFlag> {
+  const res = await arcadia.POST<{ data: PlatformFlag }>("/api/v1/admin/feature-flags", {
+    body: { flag: input },
+  })
+  return res.data
+}
+
+export async function updatePlatformFlag(
+  arcadia: ArcadiaClient,
+  id: string,
+  input: PlatformFlagInput,
+): Promise<PlatformFlag> {
+  const res = await arcadia.PUT<{ data: PlatformFlag }>(`/api/v1/admin/feature-flags/${id}`, {
+    body: { flag: input },
+  })
+  return res.data
+}
+
+export async function deletePlatformFlag(arcadia: ArcadiaClient, id: string): Promise<void> {
+  await arcadia.DELETE(`/api/v1/admin/feature-flags/${id}`)
+}
diff --git a/app/lib/arcadia/health.ts b/app/lib/arcadia/health.ts
index 307b6de..050396a 100644
--- a/app/lib/arcadia/health.ts
+++ b/app/lib/arcadia/health.ts
@@ -2,9 +2,9 @@
 //
 // Backed by /api/v1/health* (public — no auth). Each subsystem is probed
 // independently; the overall endpoint aggregates and returns 503 if any
-// subsystem is not "ok". See arcadia-app commit f427892.
+// subsystem is not "ok". See arcadia-core commit f427892.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type HealthSubsystem = "api" | "db" | "workers" | "storage"
 
diff --git a/app/lib/arcadia/integrations.ts b/app/lib/arcadia/integrations.ts
index 6385b5b..97a9a48 100644
--- a/app/lib/arcadia/integrations.ts
+++ b/app/lib/arcadia/integrations.ts
@@ -4,7 +4,7 @@
 // arcadia-console's tenant surface); this file just exposes operator-idiomatic
 // names so the page reads naturally.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 import {
   createIntegrationsApi,
   type CredentialInput,
diff --git a/app/lib/arcadia/invitations.ts b/app/lib/arcadia/invitations.ts
index 8aa3823..b1c61a4 100644
--- a/app/lib/arcadia/invitations.ts
+++ b/app/lib/arcadia/invitations.ts
@@ -1,7 +1,7 @@
 // Arcadia invitations API helpers.
 // Backed by /api/v1/invitations.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export interface InvitationRole {
   id: string
diff --git a/app/lib/arcadia/llm-configs.ts b/app/lib/arcadia/llm-configs.ts
index ac51d1c..936b0b2 100644
--- a/app/lib/arcadia/llm-configs.ts
+++ b/app/lib/arcadia/llm-configs.ts
@@ -8,7 +8,7 @@
 // `tenant_id: null` configurations are platform-defaults visible to
 // every tenant. Names are unique within (tenant, name).
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type LlmProvider = "openai" | "anthropic" | "deepseek" | "qwen" | "lmstudio"
 
@@ -124,7 +124,7 @@ export async function getCatalog(arcadia: ArcadiaClient): Promise<CatalogEntry[]
 /**
  * Compute cost in cents for a given input/output token count using a
  * configuration's published rates. Mirrors `LlmConfiguration.compute_cost_cents/3`
- * in arcadia-app — keep in sync.
+ * in arcadia-core — keep in sync.
  */
 export function computeCostCents(
   config: Pick<LlmConfiguration, "input_cost_per_million" | "output_cost_per_million">,
diff --git a/app/lib/arcadia/llm-proxy.ts b/app/lib/arcadia/llm-proxy.ts
index f202c2f..161c8c6 100644
--- a/app/lib/arcadia/llm-proxy.ts
+++ b/app/lib/arcadia/llm-proxy.ts
@@ -1,13 +1,13 @@
 // Arcadia LLM proxy client.
 //
-// Implements the spec in docs/LLM_PROXY_CONTRACT.md against arcadia-app's
+// Implements the spec in docs/LLM_PROXY_CONTRACT.md against arcadia-core's
 // POST /api/v1/ai/llm/chat. The lib (@crema/llm-providers-ui buildAdapter)
 // owns the streaming chat path itself; this module exposes a lightweight
 // non-streaming probe so the Settings "Test connection" button can verify
 // the proxy round-trips end-to-end (auth → secret resolution → upstream
 // dispatch → response shape).
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type LLMProxyProvider =
   | "openai"
diff --git a/app/lib/arcadia/memberships.ts b/app/lib/arcadia/memberships.ts
index 6fd43d9..d86b697 100644
--- a/app/lib/arcadia/memberships.ts
+++ b/app/lib/arcadia/memberships.ts
@@ -1,7 +1,7 @@
 // Tenant memberships — the M:N glue between users and tenants.
 // Backend: /api/v1/admin/memberships (admin) + /api/v1/me/tenants (self).
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type MembershipStatus = "active" | "suspended" | "deactivated" | string
 
diff --git a/app/lib/arcadia/monitoring.ts b/app/lib/arcadia/monitoring.ts
index d33f252..f608493 100644
--- a/app/lib/arcadia/monitoring.ts
+++ b/app/lib/arcadia/monitoring.ts
@@ -2,7 +2,7 @@
 // Wraps /api/v1/admin/monitoring/* + /api/v1/platform/* + a few observability
 // endpoints used by the monitoring dashboard.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 // --- Rate limits ---------------------------------------------------------
 
diff --git a/app/lib/arcadia/networking.ts b/app/lib/arcadia/networking.ts
index 4fc4ba6..832eb22 100644
--- a/app/lib/arcadia/networking.ts
+++ b/app/lib/arcadia/networking.ts
@@ -1,7 +1,7 @@
 // Networking helpers: firewalls, VPCs, domains + DNS records, floating IPs.
 // Backend: /api/v1/platform/{firewalls,vpcs,domains,floating_ips,...}.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 const BASE = "/api/v1/platform"
 
diff --git a/app/lib/arcadia/organizations.ts b/app/lib/arcadia/organizations.ts
index d33449f..74c4f97 100644
--- a/app/lib/arcadia/organizations.ts
+++ b/app/lib/arcadia/organizations.ts
@@ -5,7 +5,7 @@
 // `OrganizationContext` plug, so the same per-org routes used by end-users
 // are used here to mutate any org in the tenant.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type OrgStatus = "active" | "frozen" | "pending_deletion" | string
 export type OnOwnerRemoval =
diff --git a/app/lib/arcadia/profiles.ts b/app/lib/arcadia/profiles.ts
index 2aac4d9..cd1e035 100644
--- a/app/lib/arcadia/profiles.ts
+++ b/app/lib/arcadia/profiles.ts
@@ -3,7 +3,7 @@
 // profile fields. The "profile" here is the per-tenant profile row, not
 // the auth account.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export interface Profile {
   id: string
diff --git a/app/lib/arcadia/roles.ts b/app/lib/arcadia/roles.ts
index a2e55be..d58ab9d 100644
--- a/app/lib/arcadia/roles.ts
+++ b/app/lib/arcadia/roles.ts
@@ -1,7 +1,7 @@
 // Arcadia roles API helpers.
 // Backed by /api/v1/roles (resources route, except :new and :edit).
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export interface Role {
   id: string
diff --git a/app/lib/arcadia/scheduled-tasks.ts b/app/lib/arcadia/scheduled-tasks.ts
index debd9d4..cad797d 100644
--- a/app/lib/arcadia/scheduled-tasks.ts
+++ b/app/lib/arcadia/scheduled-tasks.ts
@@ -1,7 +1,7 @@
 // Scheduled tasks (cron) helpers.
 // Backend: /api/v1/admin/scheduled-tasks (CRUD + runs/enable/disable/trigger).
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type ScheduledTaskAction = "webhook" | "event"
 
diff --git a/app/lib/arcadia/secrets.ts b/app/lib/arcadia/secrets.ts
index 469fdcb..d2fd4cb 100644
--- a/app/lib/arcadia/secrets.ts
+++ b/app/lib/arcadia/secrets.ts
@@ -5,7 +5,7 @@
 // exposed by these endpoints. Tenant-side resolution (returning the value)
 // goes through a separate runtime endpoint that's not used by the admin UI.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type SecretCategory =
   | "api_key"
diff --git a/app/lib/arcadia/sso.ts b/app/lib/arcadia/sso.ts
index f4a3f9e..7c75785 100644
--- a/app/lib/arcadia/sso.ts
+++ b/app/lib/arcadia/sso.ts
@@ -2,7 +2,7 @@
 // Backend: /api/v1/sso/identity-providers (tenant CRUD) + /sessions.
 // Note: certificates are large and write-only.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export interface IdentityProvider {
   id: string
diff --git a/app/lib/arcadia/status-page.ts b/app/lib/arcadia/status-page.ts
index c43a982..b932937 100644
--- a/app/lib/arcadia/status-page.ts
+++ b/app/lib/arcadia/status-page.ts
@@ -1,7 +1,7 @@
 // Status page helpers — components, incidents, subscribers.
 // Backend: /api/v1/admin/status-page/* (admin CRUD).
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type ComponentStatus =
   | "operational"
diff --git a/app/lib/arcadia/storage-configs.ts b/app/lib/arcadia/storage-configs.ts
index 43dd9f7..1d82dd5 100644
--- a/app/lib/arcadia/storage-configs.ts
+++ b/app/lib/arcadia/storage-configs.ts
@@ -8,7 +8,7 @@
 // generic `arcadia.GET<T>` / `arcadia.POST<T>` / etc. — same pattern as
 // `tenants.ts`. Switch to `arcadia.typed.*` when the spec gains coverage.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type StorageBackend = "s3" | "local" | "gcs"
 export type StorageStatus = "active" | "inactive" | "degraded" | "maintenance"
diff --git a/app/lib/arcadia/tenants.ts b/app/lib/arcadia/tenants.ts
index ccc602f..5657beb 100644
--- a/app/lib/arcadia/tenants.ts
+++ b/app/lib/arcadia/tenants.ts
@@ -6,7 +6,7 @@
 // gains coverage, switch to `arcadia.typed.GET("/api/v1/admin/tenants", ...)`
 // and drop these manual types.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import { ArcadiaError, type ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type TenantStatus = "active" | "suspended" | "deactivated" | string
 
@@ -111,3 +111,427 @@ export async function provisionTenant(
   })
   return res.data
 }
+
+// ---------------------------------------------------------------------------
+// Tenant detail — one screen per tab, all against /admin/tenants/:id/*.
+// Enum values mirror arcadia-core's Tenant schema (tenant.ex) so the pickers
+// only offer values the server will accept.
+// ---------------------------------------------------------------------------
+
+export const TENANT_PLANS = ["free", "starter", "professional", "enterprise", "custom"]
+export const TENANT_LOCALES = ["en", "es", "fr", "de", "pt", "ja", "zh"]
+export const TENANT_CURRENCIES = ["USD", "EUR", "GBP", "CAD", "AUD", "JPY", "CNY"]
+export const EMAIL_PROVIDERS = ["smtp", "sendgrid", "mailgun", "ses"] as const
+export const SMS_PROVIDERS = ["twilio", "vonage", "messagebird"] as const
+// A curated subset — the server accepts any IANA name, but a full 400-entry
+// list is worse UX than the ones operators actually pick.
+export const COMMON_TIMEZONES = [
+  "UTC",
+  "America/New_York",
+  "America/Chicago",
+  "America/Denver",
+  "America/Los_Angeles",
+  "Europe/London",
+  "Europe/Paris",
+  "Europe/Berlin",
+  "Asia/Tokyo",
+  "Asia/Shanghai",
+  "Asia/Singapore",
+  "Australia/Sydney",
+  "Pacific/Auckland",
+]
+
+/** Rename the tenant. */
+export async function updateTenant(
+  arcadia: ArcadiaClient,
+  id: string,
+  tenant: { name?: string },
+): Promise<Tenant> {
+  const res = await arcadia.PUT<{ data: Tenant }>(`/api/v1/admin/tenants/${id}`, {
+    body: { tenant },
+  })
+  return res.data
+}
+
+export async function updateBranding(
+  arcadia: ArcadiaClient,
+  id: string,
+  branding: Partial<Omit<TenantBranding, "settings">>,
+): Promise<Tenant> {
+  const res = await arcadia.PUT<{ data: Tenant }>(`/api/v1/admin/tenants/${id}/branding`, {
+    body: { branding },
+  })
+  return res.data
+}
+
+export async function updateLocalization(
+  arcadia: ArcadiaClient,
+  id: string,
+  localization: Partial<Omit<TenantLocalization, "settings">>,
+): Promise<Tenant> {
+  const res = await arcadia.PUT<{ data: Tenant }>(`/api/v1/admin/tenants/${id}/localization`, {
+    body: { localization },
+  })
+  return res.data
+}
+
+/** The plan endpoint nests its params under `plan` and validates the slug
+ *  against the server's plan list — pass one of `TENANT_PLANS`. */
+export async function updatePlan(
+  arcadia: ArcadiaClient,
+  id: string,
+  plan: { plan: string; plan_limits?: Record<string, unknown> },
+): Promise<Tenant> {
+  const res = await arcadia.PUT<{ data: Tenant }>(`/api/v1/admin/tenants/${id}/plan`, {
+    body: { plan },
+  })
+  return res.data
+}
+
+// --- Quotas & usage ---
+
+export interface QuotaConfig {
+  category: string
+  calls_per_minute: number | null
+  calls_per_day: number | null
+  calls_per_month: number | null
+  enabled: boolean
+}
+
+export interface UsageRow {
+  category: string
+  usage: { minute: number; day: number; month: number }
+  quota: {
+    enabled: boolean
+    calls_per_minute: number | null
+    calls_per_day: number | null
+    calls_per_month: number | null
+  }
+}
+
+export async function listUsage(arcadia: ArcadiaClient, id: string): Promise<UsageRow[]> {
+  const res = await arcadia.GET<{ data: UsageRow[] }>(
+    `/api/v1/admin/tenants/${id}/api-metering/usage`,
+  )
+  return res.data
+}
+
+export async function upsertQuota(
+  arcadia: ArcadiaClient,
+  id: string,
+  category: string,
+  limits: Partial<Omit<QuotaConfig, "category">>,
+): Promise<QuotaConfig> {
+  const res = await arcadia.PUT<{ data: QuotaConfig }>(
+    `/api/v1/admin/tenants/${id}/api-metering/quotas/${encodeURIComponent(category)}`,
+    { body: limits },
+  )
+  return res.data
+}
+
+export async function deleteQuota(
+  arcadia: ArcadiaClient,
+  id: string,
+  category: string,
+): Promise<void> {
+  await arcadia.DELETE(
+    `/api/v1/admin/tenants/${id}/api-metering/quotas/${encodeURIComponent(category)}`,
+  )
+}
+
+// --- Feature flags ---
+//
+// The list is one row per *platform-defined* flag, overlaid with this tenant's
+// override: `source` is "override" when the tenant pins a value, "default" when
+// it inherits `enabled_by_default`. You can only override a flag that exists at
+// the platform level — an override for an unknown key is stored but never shown
+// (define platform flags under the platform Feature-flags screen). So an empty
+// list means "no platform flags defined", not "no overrides".
+
+export interface TenantFeatureFlag {
+  key: string
+  description: string | null
+  enabled: boolean
+  source: "override" | "default" | string
+}
+
+export async function listFeatureFlags(
+  arcadia: ArcadiaClient,
+  id: string,
+): Promise<TenantFeatureFlag[]> {
+  const res = await arcadia.GET<{ data: TenantFeatureFlag[] }>(
+    `/api/v1/admin/tenants/${id}/feature-flags`,
+  )
+  return res.data
+}
+
+/** Pin `key` on/off for this tenant, overriding the platform default. */
+export async function setFeatureFlag(
+  arcadia: ArcadiaClient,
+  id: string,
+  key: string,
+  enabled: boolean,
+): Promise<void> {
+  await arcadia.PUT(
+    `/api/v1/admin/tenants/${id}/feature-flags/${encodeURIComponent(key)}`,
+    { body: { enabled } },
+  )
+}
+
+/** Drop the tenant's override for `key`, reverting it to the platform default. */
+export async function clearFeatureFlag(
+  arcadia: ArcadiaClient,
+  id: string,
+  key: string,
+): Promise<void> {
+  await arcadia.DELETE(`/api/v1/admin/tenants/${id}/feature-flags/${encodeURIComponent(key)}`)
+}
+
+// --- IP rules ---
+
+export interface IpRule {
+  id: string
+  cidr: string
+  rule_type: "allow" | "deny" | string
+  description: string | null
+  enabled: boolean
+}
+
+export type IpRuleInput = {
+  cidr: string
+  rule_type: "allow" | "deny"
+  description?: string
+  enabled?: boolean
+}
+
+export async function listIpRules(arcadia: ArcadiaClient, id: string): Promise<IpRule[]> {
+  const res = await arcadia.GET<{ data: IpRule[] }>(`/api/v1/admin/tenants/${id}/ip-rules`)
+  return res.data
+}
+
+export async function createIpRule(
+  arcadia: ArcadiaClient,
+  id: string,
+  input: IpRuleInput,
+): Promise<IpRule> {
+  const res = await arcadia.POST<{ data: IpRule }>(`/api/v1/admin/tenants/${id}/ip-rules`, {
+    body: input,
+  })
+  return res.data
+}
+
+export async function updateIpRule(
+  arcadia: ArcadiaClient,
+  id: string,
+  ruleId: string,
+  input: Partial<IpRuleInput>,
+): Promise<IpRule> {
+  const res = await arcadia.PUT<{ data: IpRule }>(
+    `/api/v1/admin/tenants/${id}/ip-rules/${ruleId}`,
+    { body: input },
+  )
+  return res.data
+}
+
+export async function deleteIpRule(
+  arcadia: ArcadiaClient,
+  id: string,
+  ruleId: string,
+): Promise<void> {
+  await arcadia.DELETE(`/api/v1/admin/tenants/${id}/ip-rules/${ruleId}`)
+}
+
+// --- Inbound webhooks ---
+
+export interface InboundWebhookSource {
+  id: string
+  name: string
+  provider: string | null
+  signature_header: string | null
+  signature_algorithm: string
+  enabled: boolean
+  event_mappings?: Record<string, unknown>
+  metadata?: Record<string, unknown>
+  inserted_at?: string
+}
+
+export type InboundWebhookInput = {
+  name: string
+  provider?: string
+  signing_secret?: string
+  signature_header?: string
+  signature_algorithm?: string
+  enabled?: boolean
+}
+
+export interface InboundWebhookDelivery {
+  id: string
+  status?: string
+  received_at?: string
+  inserted_at?: string
+  [key: string]: unknown
+}
+
+export async function listInboundWebhooks(
+  arcadia: ArcadiaClient,
+  id: string,
+): Promise<InboundWebhookSource[]> {
+  const res = await arcadia.GET<{ data: InboundWebhookSource[] }>(
+    `/api/v1/admin/tenants/${id}/inbound-webhooks`,
+  )
+  return res.data
+}
+
+export async function createInboundWebhook(
+  arcadia: ArcadiaClient,
+  id: string,
+  input: InboundWebhookInput,
+): Promise<InboundWebhookSource> {
+  const res = await arcadia.POST<{ data: InboundWebhookSource }>(
+    `/api/v1/admin/tenants/${id}/inbound-webhooks`,
+    { body: input },
+  )
+  return res.data
+}
+
+export async function updateInboundWebhook(
+  arcadia: ArcadiaClient,
+  id: string,
+  sourceId: string,
+  input: Partial<InboundWebhookInput>,
+): Promise<InboundWebhookSource> {
+  const res = await arcadia.PUT<{ data: InboundWebhookSource }>(
+    `/api/v1/admin/tenants/${id}/inbound-webhooks/${sourceId}`,
+    { body: input },
+  )
+  return res.data
+}
+
+export async function deleteInboundWebhook(
+  arcadia: ArcadiaClient,
+  id: string,
+  sourceId: string,
+): Promise<void> {
+  await arcadia.DELETE(`/api/v1/admin/tenants/${id}/inbound-webhooks/${sourceId}`)
+}
+
+export async function listInboundWebhookDeliveries(
+  arcadia: ArcadiaClient,
+  id: string,
+  sourceId: string,
+): Promise<InboundWebhookDelivery[]> {
+  const res = await arcadia.GET<{ data: InboundWebhookDelivery[] }>(
+    `/api/v1/admin/tenants/${id}/inbound-webhooks/${sourceId}/deliveries`,
+  )
+  return res.data
+}
+
+// --- Email & SMS delivery config ---
+// GET 404s when unconfigured; credentials are write-only (never returned).
+
+export interface EmailConfig {
+  id: string
+  provider: (typeof EMAIL_PROVIDERS)[number] | string
+  from_email: string | null
+  from_name: string | null
+  reply_to: string | null
+  enabled: boolean
+}
+
+export type EmailConfigInput = {
+  provider: string
+  from_email?: string
+  from_name?: string
+  reply_to?: string
+  credentials?: Record<string, unknown>
+  enabled?: boolean
+}
+
+export interface SmsConfig {
+  id: string
+  provider: (typeof SMS_PROVIDERS)[number] | string
+  from_number: string | null
+  enabled: boolean
+}
+
+export type SmsConfigInput = {
+  provider: string
+  from_number?: string
+  credentials?: Record<string, unknown>
+  enabled?: boolean
+}
+
+export interface TestResult {
+  ok: boolean
+  message: string
+}
+
+/** Resolves to null when no config exists (the endpoint 404s), so callers can
+ *  distinguish "unconfigured" from a real load failure. */
+export async function getEmailConfig(
+  arcadia: ArcadiaClient,
+  id: string,
+): Promise<EmailConfig | null> {
+  return getOrNull<EmailConfig>(arcadia, `/api/v1/admin/tenants/${id}/email-config`)
+}
+
+export async function upsertEmailConfig(
+  arcadia: ArcadiaClient,
+  id: string,
+  input: EmailConfigInput,
+): Promise<EmailConfig> {
+  const res = await arcadia.PUT<{ data: EmailConfig }>(
+    `/api/v1/admin/tenants/${id}/email-config`,
+    { body: { email_config: input } },
+  )
+  return res.data
+}
+
+export async function deleteEmailConfig(arcadia: ArcadiaClient, id: string): Promise<void> {
+  await arcadia.DELETE(`/api/v1/admin/tenants/${id}/email-config`)
+}
+
+export async function testEmailConfig(
+  arcadia: ArcadiaClient,
+  id: string,
+): Promise<TestResult> {
+  return arcadia.POST<TestResult>(`/api/v1/admin/tenants/${id}/email-config/test`)
+}
+
+export async function getSmsConfig(
+  arcadia: ArcadiaClient,
+  id: string,
+): Promise<SmsConfig | null> {
+  return getOrNull<SmsConfig>(arcadia, `/api/v1/admin/tenants/${id}/sms-config`)
+}
+
+export async function upsertSmsConfig(
+  arcadia: ArcadiaClient,
+  id: string,
+  input: SmsConfigInput,
+): Promise<SmsConfig> {
+  const res = await arcadia.PUT<{ data: SmsConfig }>(`/api/v1/admin/tenants/${id}/sms-config`, {
+    body: { sms_config: input },
+  })
+  return res.data
+}
+
+export async function deleteSmsConfig(arcadia: ArcadiaClient, id: string): Promise<void> {
+  await arcadia.DELETE(`/api/v1/admin/tenants/${id}/sms-config`)
+}
+
+export async function testSmsConfig(arcadia: ArcadiaClient, id: string): Promise<TestResult> {
+  return arcadia.POST<TestResult>(`/api/v1/admin/tenants/${id}/sms-config/test`)
+}
+
+/** GET that treats a 404 as "not configured yet" (null) rather than an error,
+ *  and rethrows anything else so real failures still surface. */
+async function getOrNull<T>(arcadia: ArcadiaClient, path: string): Promise<T | null> {
+  try {
+    const res = await arcadia.GET<{ data: T }>(path)
+    return res.data
+  } catch (err) {
+    if (err instanceof ArcadiaError && err.status === 404) return null
+    throw err
+  }
+}
diff --git a/app/lib/arcadia/user-stats.ts b/app/lib/arcadia/user-stats.ts
index d19f2a0..e29b45d 100644
--- a/app/lib/arcadia/user-stats.ts
+++ b/app/lib/arcadia/user-stats.ts
@@ -1,6 +1,6 @@
 // Per-user usage + quota helpers.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export interface UserUsage {
   storage_used_bytes: number
diff --git a/app/lib/arcadia/users.ts b/app/lib/arcadia/users.ts
index f206af0..9d78aa0 100644
--- a/app/lib/arcadia/users.ts
+++ b/app/lib/arcadia/users.ts
@@ -4,7 +4,7 @@
 // describe these operations as typed paths, so we hand-roll types and use
 // the generic verb methods on the client. Same pattern as tenants.ts.
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type UserStatus = "active" | "inactive" | "suspended"
 
@@ -109,3 +109,41 @@ export async function setUserStatus(
 ): Promise<User> {
   return updateUser(arcadia, id, { status })
 }
+
+// --- Impersonation ---
+// The operator (platform/tenant admin) can act as another user for support.
+// `startImpersonation` returns a token scoped to the target; the client swaps
+// to it (see session.beginImpersonation). Stopping is a client-side restore of
+// the operator's parked session — the /stop endpoint can't be reached with the
+// impersonation token (it lacks admin), so we don't rely on it.
+
+export interface CanImpersonate {
+  can_impersonate: boolean
+  user: Pick<User, "id" | "email" | "status"> & { first_name?: string; last_name?: string }
+}
+
+export interface ImpersonationToken {
+  access_token: string
+  impersonated_by: string
+  expires_in: number
+}
+
+export async function canImpersonate(
+  arcadia: ArcadiaClient,
+  userId: string,
+): Promise<CanImpersonate> {
+  const res = await arcadia.GET<{ data: CanImpersonate }>(
+    `/api/v1/admin/impersonate/${userId}/can-impersonate`,
+  )
+  return res.data
+}
+
+export async function startImpersonation(
+  arcadia: ArcadiaClient,
+  userId: string,
+): Promise<ImpersonationToken> {
+  const res = await arcadia.POST<{ data: ImpersonationToken }>(
+    `/api/v1/admin/impersonate/${userId}`,
+  )
+  return res.data
+}
diff --git a/app/lib/arcadia/webhooks.ts b/app/lib/arcadia/webhooks.ts
index c0f6c3d..23220a2 100644
--- a/app/lib/arcadia/webhooks.ts
+++ b/app/lib/arcadia/webhooks.ts
@@ -1,7 +1,7 @@
 // Outbound webhook helpers.
 // Backend: /api/v1/webhooks (CRUD + pause/resume/regenerate-secret/deliveries/stats/test).
 
-import type { ArcadiaClient } from "@crema/arcadia-client"
+import type { ArcadiaClient } from "@crema/arcadia-core-client"
 
 export type WebhookStatus = "active" | "paused" | "disabled"
 export type WebhookRetryStrategy = "linear" | "exponential"
diff --git a/app/lib/capabilities.ts b/app/lib/capabilities.ts
index 63b38c0..0dbeeb7 100644
--- a/app/lib/capabilities.ts
+++ b/app/lib/capabilities.ts
@@ -39,6 +39,7 @@ export type Capability =
   | "platform.search"
   | "platform.ai"
   | "platform.integrations" // external-API registry (keys/budgets) on the gateway
+  | "platform.feature_flags"
   // Special — always-on; not gated.
   | "always.assistant"
   | "always.profile"
@@ -84,6 +85,7 @@ const PLATFORM_ADMIN_CAPS: Capability[] = [
   "platform.search",
   "platform.ai",
   "platform.integrations",
+  "platform.feature_flags",
 ]
 
 const ALWAYS_CAPS: Capability[] = ["always.assistant", "always.profile"]
@@ -114,11 +116,12 @@ export const ROUTE_CAPABILITY: Record<string, Capability> = {
   "/memberships": "tenant.memberships",
   "/storage": "tenant.storage",
   "/buckets": "tenant.buckets",
-  "/activity": "tenant.activity",
+  "/audit-log": "tenant.activity",
+  "/activity": "tenant.activity", // legacy path → redirects to /audit-log
   "/settings": "tenant.settings",
-  "/apps": "tenant.apps",
-  "/plan": "tenant.plan",
-  "/entitlements": "tenant.entitlements",
+  // Plan, Entitlements, and Apps collapsed into one Billing surface (Phase 3).
+  // They split back out under this same capability set once wired (Phase 5).
+  "/billing": "tenant.plan",
 
   "/tenants": "platform.tenants",
   "/organizations": "platform.organizations",
@@ -134,6 +137,7 @@ export const ROUTE_CAPABILITY: Record<string, Capability> = {
   "/search": "platform.search",
   "/ai": "platform.ai",
   "/integrations": "platform.integrations",
+  "/feature-flags": "platform.feature_flags",
 
   "/assistant": "always.assistant",
   "/profile": "always.profile",
diff --git a/app/lib/errors.ts b/app/lib/errors.ts
new file mode 100644
index 0000000..fa49573
--- /dev/null
+++ b/app/lib/errors.ts
@@ -0,0 +1,134 @@
+// One place that turns whatever the API threw into something an operator can
+// act on. Before this existed, every list screen surfaced the raw status text
+// ("Internal Server Error", "Too Many Requests", "Bad Request") — which names
+// the failure but never the fix — and, worse, rendered its empty state *next
+// to* the error, so "the load failed" and "there is nothing here" looked
+// identical. An operator can't tell an empty audit log from a broken one.
+
+import { ArcadiaError } from "@crema/arcadia-core-client"
+
+export type LoadError = {
+  /** Plain-language headline. Never a raw HTTP status. */
+  title: string
+  /** What to do about it. Empty when there's genuinely nothing to suggest. */
+  detail: string
+  status?: number
+  /** Set for 429s — seconds until it's worth retrying. Drives auto-retry. */
+  retryAfterSec?: number
+  /** True when retrying might plausibly work (5xx, 429, network). */
+  retryable: boolean
+  /** Field-level validation messages, flattened from Ecto's error tree. */
+  fields?: string[]
+}
+
+/** Flatten Ecto's nested `{tenant: {slug: ["has already been taken"]}}`. */
+function flattenFieldErrors(details: unknown): string[] {
+  const lines: string[] = []
+  const walk = (obj: unknown, prefix: string) => {
+    if (Array.isArray(obj)) {
+      lines.push(prefix ? `${prefix}: ${obj.join(", ")}` : obj.join(", "))
+    } else if (obj && typeof obj === "object") {
+      for (const [k, v] of Object.entries(obj)) {
+        walk(v, prefix ? `${prefix}.${k}` : k)
+      }
+    }
+  }
+  walk(details, "")
+  return lines
+}
+
+export function describeError(err: unknown, context = "load"): LoadError {
+  // Network / CORS / server down — fetch rejects before any status exists.
+  if (err instanceof TypeError || (err instanceof Error && /fetch/i.test(err.message))) {
+    return {
+      title: "Can't reach arcadia",
+      detail:
+        "The API didn't respond. Check the service is running and that this host is allowed to call it, then retry.",
+      retryable: true,
+    }
+  }
+
+  if (!(err instanceof ArcadiaError)) {
+    return {
+      title: `Couldn't ${context}`,
+      detail: err instanceof Error && err.message ? err.message : "An unexpected error occurred.",
+      retryable: true,
+    }
+  }
+
+  const fields = err.details ? flattenFieldErrors(err.details) : undefined
+
+  switch (true) {
+    case err.status === 401:
+      return {
+        title: "Your session has expired",
+        detail: "Sign in again to continue.",
+        status: 401,
+        retryable: false,
+      }
+
+    case err.status === 403:
+      return {
+        title: "You don't have access to this",
+        detail:
+          "Your account lacks the role this screen needs. A platform administrator can grant it.",
+        status: 403,
+        retryable: false,
+      }
+
+    case err.status === 404:
+      return {
+        title: "Not found",
+        detail: "It may have been deleted, or the endpoint isn't available on this deployment.",
+        status: 404,
+        retryable: false,
+      }
+
+    case err.status === 422:
+      return {
+        title: "That didn't validate",
+        detail: fields?.length ? "" : err.message,
+        status: 422,
+        retryable: false,
+        fields,
+      }
+
+    case err.status === 429:
+      return {
+        title: "Too many requests",
+        detail: "arcadia is rate-limiting this console. It'll retry automatically.",
+        status: 429,
+        retryAfterSec: 30,
+        retryable: true,
+      }
+
+    case err.status >= 500:
+      return {
+        title: "arcadia hit a server error",
+        detail: `The request failed on the server${
+          err.requestId ? ` (request ${err.requestId})` : ""
+        }. Retry, and if it persists check the service logs.`,
+        status: err.status,
+        retryable: true,
+      }
+
+    default:
+      return {
+        title: `Couldn't ${context}`,
+        // Prefer the server's own message over the bare status line.
+        detail: fields?.length ? "" : err.message,
+        status: err.status,
+        retryable: err.status >= 500,
+        fields,
+      }
+  }
+}
+
+/** One-line form, for toasts and inside dialogs. */
+export function errorMessage(err: unknown, context = "save"): string {
+  const d = describeError(err, context)
+  const parts = [d.title]
+  if (d.fields?.length) parts.push(d.fields.join("; "))
+  else if (d.detail) parts.push(d.detail)
+  return parts.join(" — ")
+}
diff --git a/app/lib/gateway.ts b/app/lib/gateway.ts
index 471d934..2871fea 100644
--- a/app/lib/gateway.ts
+++ b/app/lib/gateway.ts
@@ -1,13 +1,13 @@
 // Arcadia LLM-gateway client.
 //
-// The integration registry lives on arcadia-llm-gateway, not arcadia-app, so
+// The integration registry lives on arcadia-llm-gateway, not arcadia-core, so
 // it needs its own ArcadiaClient pointed at a different base URL. Everything
-// else is identical to the arcadia-app client: the same access token (the
-// gateway validates arcadia-app JWTs via the shared Guardian secret) and the
+// else is identical to the arcadia-core client: the same access token (the
+// gateway validates arcadia-core JWTs via the shared Guardian secret) and the
 // same 401 cleanup. The gateway's CORS already allows localhost + any
 // *.sky-ai.com origin, so the browser calls it directly.
 
-import { createArcadiaClient, type ArcadiaClient } from "@crema/arcadia-client"
+import { createArcadiaClient, type ArcadiaClient } from "@crema/arcadia-core-client"
 
 const GATEWAY_URL = import.meta.env.VITE_LLM_GATEWAY_URL ?? "http://localhost:4015"
 
diff --git a/app/lib/llm-config-bootstrap.tsx b/app/lib/llm-config-bootstrap.tsx
index 07d8126..2542d4e 100644
--- a/app/lib/llm-config-bootstrap.tsx
+++ b/app/lib/llm-config-bootstrap.tsx
@@ -11,7 +11,7 @@
 // panel remains the place to switch between configs.
 
 import { useEffect } from "react"
-import { useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
 import {
   loadSettings,
   saveSettings,
diff --git a/app/lib/notifications.ts b/app/lib/notifications.ts
index 398d71e..3ccdc53 100644
--- a/app/lib/notifications.ts
+++ b/app/lib/notifications.ts
@@ -2,7 +2,7 @@
 // Pair with @crema/notification-ui's <ToastProvider /> for transient toasts;
 // this store is for the appbar bell's persistent inbox.
 
-import { useEffect, useSyncExternalStore } from "react"
+import { useSyncExternalStore } from "react"
 
 export type NotificationKind = "info" | "success" | "warning" | "error"
 
@@ -95,11 +95,27 @@ export function dismissAll() {
   writeToStorage([])
 }
 
-let cached: AppNotification[] | null = null
+// Cache keyed on the raw stored string so the snapshot stays referentially
+// stable — `useSyncExternalStore` requires that getSnapshot return the same
+// reference until the value genuinely changes. (This used to clear a flag on
+// every mount without notifying subscribers, the same identity-churn bug that
+// was fixed in session.ts.)
+let cached: AppNotification[] = []
+let cachedRaw: string | null = null
+let primed = false
+
+function readRaw(): string | null {
+  if (typeof window === "undefined") return null
+  try {
+    return localStorage.getItem(STORAGE_KEY)
+  } catch {
+    return null
+  }
+}
 
 function subscribe(cb: () => void): () => void {
   const onChange = () => {
-    cached = null
+    primed = false
     cb()
   }
   window.addEventListener(CHANGE_EVENT, onChange)
@@ -109,7 +125,12 @@ function subscribe(cb: () => void): () => void {
   return () => window.removeEventListener(CHANGE_EVENT, onChange)
 }
 function getSnapshot(): AppNotification[] {
-  if (!cached) cached = readFromStorage()
+  const raw = readRaw()
+  if (!primed || raw !== cachedRaw) {
+    cachedRaw = raw
+    cached = readFromStorage()
+    primed = true
+  }
   return cached
 }
 function getServerSnapshot(): AppNotification[] {
@@ -117,39 +138,9 @@ function getServerSnapshot(): AppNotification[] {
 }
 
 export function useNotifications(): AppNotification[] {
-  const value = useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot)
-  useEffect(() => {
-    cached = null
-  }, [])
-  return value
+  return useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot)
 }
 
 export function unreadCount(items: AppNotification[]): number {
   return items.filter((n) => !n.readAt).length
 }
-
-/** Seed a few demo notifications on first load so the bell isn't empty. */
-export function seedIfEmpty() {
-  if (typeof window === "undefined") return
-  if (localStorage.getItem(STORAGE_KEY)) return
-  const now = Date.now()
-  const seed: AppNotification[] = [
-    {
-      id: newId(),
-      kind: "info",
-      title: "Welcome",
-      body: "Tag elements with data-action and the assistant can drive them.",
-      href: "/assistant",
-      createdAt: now - 60_000,
-    },
-    {
-      id: newId(),
-      kind: "success",
-      title: "Profile saved",
-      body: "Your display name and avatar are live across the app.",
-      href: "/profile",
-      createdAt: now - 5 * 60_000,
-    },
-  ]
-  writeToStorage(seed)
-}
diff --git a/app/lib/profile-bootstrap.tsx b/app/lib/profile-bootstrap.tsx
index 6d1a342..c489d7d 100644
--- a/app/lib/profile-bootstrap.tsx
+++ b/app/lib/profile-bootstrap.tsx
@@ -3,7 +3,7 @@
 // immediately, without waiting for the user to navigate to /profile.
 
 import { useEffect } from "react"
-import { useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
 
 import { fetchDigitalObjectAsBlobUrl } from "~/lib/arcadia/digital-objects"
 import { getProfile, pickAvatarUrl } from "~/lib/arcadia/profiles"
diff --git a/app/lib/session.ts b/app/lib/session.ts
index 9492fa4..35aac93 100644
--- a/app/lib/session.ts
+++ b/app/lib/session.ts
@@ -3,7 +3,7 @@
 // routes after a successful arcadia API exchange. The shape here matches what
 // AppShell + useUser expect.
 
-import { useEffect, useSyncExternalStore } from "react"
+import { useSyncExternalStore } from "react"
 
 import { profileInitials } from "~/lib/profile"
 import { decodeJwt, type AvailableTenantClaim } from "~/lib/jwt"
@@ -27,9 +27,16 @@ export type Session = {
   tenantSlug?: string
   roles: string[]
   availableTenants: AvailableTenant[]
+  // Set (to the operator's user id) when this session is an impersonation —
+  // derived from the JWT's `impersonated_by` claim. Drives the "Viewing as"
+  // banner and gates the normal identity chrome.
+  impersonatedBy?: string
 }
 
 const STORAGE_KEY = "crema.session"
+// Where the operator's real session is parked while they impersonate someone,
+// so Stop can restore it without another round-trip.
+const IMPERSONATION_BACKUP_KEY = "crema.session.impersonation-backup"
 const CHANGE_EVENT = "crema:session-change"
 
 function readFromStorage(): Session | null {
@@ -66,6 +73,8 @@ function readFromStorage(): Session | null {
               !!t && typeof (t as AvailableTenant).id === "string",
           ) as AvailableTenant[])
         : [],
+      impersonatedBy:
+        typeof parsed.impersonatedBy === "string" ? parsed.impersonatedBy : undefined,
     }
   } catch {
     return null
@@ -157,12 +166,118 @@ export function hasSession(): boolean {
   return !!readFromStorage()
 }
 
+/** Build a Session from a bare access token (used for impersonation, where the
+ *  server hands back a token but no user record — identity comes from the
+ *  token's own claims). */
+function sessionFromToken(token: string, fallbackEmail = "impersonated user"): Session {
+  const claims = decodeJwt(token) ?? {}
+  const email = typeof claims.email === "string" ? claims.email : fallbackEmail
+  // `sub` is "<user_id>:<tenant_id>" — take the user id.
+  const sub = typeof claims.sub === "string" ? claims.sub.split(":")[0] : ""
+  const availableTenants: AvailableTenant[] = Array.isArray(claims.available_tenants)
+    ? (claims.available_tenants as AvailableTenantClaim[])
+        .filter((t) => t && typeof t.id === "string")
+        .map((t) => ({ id: t.id as string, slug: t.slug, name: t.name, roles: t.roles ?? [] }))
+    : []
+  return {
+    userId: (typeof claims.sub === "string" ? sub : "") || email,
+    name: email,
+    email,
+    token,
+    issuedAt: Date.now(),
+    tenantId: typeof claims.tenant_id === "string" ? claims.tenant_id : undefined,
+    tenantSlug: typeof claims.tenant_slug === "string" ? claims.tenant_slug : undefined,
+    roles: Array.isArray(claims.roles) ? (claims.roles as string[]) : [],
+    availableTenants,
+    impersonatedBy:
+      typeof claims.impersonated_by === "string" ? claims.impersonated_by : undefined,
+  }
+}
+
+/**
+ * Enter impersonation: park the operator's real session, then swap the active
+ * session + token to the impersonation token the server minted. Every
+ * subsequent request acts as the target user.
+ */
+export function beginImpersonation(impersonationToken: string): Session | null {
+  if (typeof window === "undefined") return null
+  const current = readFromStorage()
+  if (!current) return null
+
+  // Back up the operator's real session + API token so Stop can restore both.
+  const currentApiToken = sessionStorage.getItem("arcadia_access_token")
+  localStorage.setItem(
+    IMPERSONATION_BACKUP_KEY,
+    JSON.stringify({ session: current, apiToken: currentApiToken }),
+  )
+
+  const next = sessionFromToken(impersonationToken, current.email)
+  sessionStorage.setItem("arcadia_access_token", impersonationToken)
+  localStorage.setItem(STORAGE_KEY, JSON.stringify(next))
+  window.dispatchEvent(new CustomEvent(CHANGE_EVENT))
+  return next
+}
+
+/** True when an impersonation backup is parked (i.e. we can Stop). */
+export function isImpersonating(): boolean {
+  if (typeof window === "undefined") return false
+  return !!localStorage.getItem(IMPERSONATION_BACKUP_KEY)
+}
+
+/**
+ * Leave impersonation: restore the operator's parked session + API token.
+ * Impersonation is stateless (just which token the client sends), so this is a
+ * pure client-side restore — no server round-trip needed.
+ */
+export function endImpersonation(): Session | null {
+  if (typeof window === "undefined") return null
+  const raw = localStorage.getItem(IMPERSONATION_BACKUP_KEY)
+  if (!raw) return null
+  try {
+    const { session, apiToken } = JSON.parse(raw) as {
+      session: Session
+      apiToken: string | null
+    }
+    if (apiToken) sessionStorage.setItem("arcadia_access_token", apiToken)
+    else sessionStorage.removeItem("arcadia_access_token")
+    localStorage.setItem(STORAGE_KEY, JSON.stringify(session))
+    localStorage.removeItem(IMPERSONATION_BACKUP_KEY)
+    window.dispatchEvent(new CustomEvent(CHANGE_EVENT))
+    return session
+  } catch {
+    localStorage.removeItem(IMPERSONATION_BACKUP_KEY)
+    return null
+  }
+}
+
+// `useSyncExternalStore` demands a *referentially stable* snapshot: it must
+// return the identical object until the underlying value genuinely changes.
+// Keying the cache on the raw stored string gives us that for free — reparse
+// only when the bytes differ.
+//
+// This used to keep a `cacheValid` flag that `useSession` cleared on mount,
+// which meant the very next render reparsed storage and produced a brand-new
+// Session object. Every `useEffect([session, …])` in the app then saw a
+// "changed" session and refetched: three identical GETs per list screen, and
+// enough request volume during navigation to trip arcadia's own rate limiter
+// and greet the operator with 429 banners. The session had not changed at all.
 let cached: Session | null = null
-let cacheValid = false
+let cachedRaw: string | null = null
+let primed = false
+
+function readRaw(): string | null {
+  if (typeof window === "undefined") return null
+  try {
+    return localStorage.getItem(STORAGE_KEY)
+  } catch {
+    return null
+  }
+}
 
 function subscribe(cb: () => void): () => void {
   const onChange = () => {
-    cacheValid = false
+    // Force the next getSnapshot to reparse, then let React re-render.
+    primed = false
     cb()
   }
   window.addEventListener(CHANGE_EVENT, onChange)
@@ -171,23 +286,25 @@ function subscribe(cb: () => void): () => void {
   })
   return () => window.removeEventListener(CHANGE_EVENT, onChange)
 }
+
 function getSnapshot(): Session | null {
-  if (!cacheValid) {
+  const raw = readRaw()
+  if (!primed || raw !== cachedRaw) {
+    cachedRaw = raw
+    // readFromStorage re-validates expiry and may clear the token; when it
+    // does, `raw` differs on the next read and we reparse again.
     cached = readFromStorage()
-    cacheValid = true
+    primed = true
   }
   return cached
 }
+
 function getServerSnapshot(): Session | null {
   return null
 }
 
 export function useSession(): Session | null {
-  const s = useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot)
-  useEffect(() => {
-    cacheValid = false
-  }, [])
-  return s
+  return useSyncExternalStore(subscribe, getSnapshot, getServerSnapshot)
 }
 
 export function sessionInitials(session: Session | null): string {
diff --git a/app/root.tsx b/app/root.tsx
index 33eff63..809e294 100644
--- a/app/root.tsx
+++ b/app/root.tsx
@@ -12,7 +12,7 @@ import "./app.css"
 
 import { ToastProvider, Toaster } from "@crema/notification-ui"
 import { CommandBusProvider } from "@crema/action-bus"
-import { ArcadiaProvider } from "@crema/arcadia-client"
+import { ArcadiaProvider } from "@crema/arcadia-core-client"
 import { LlmConfigBootstrap } from "~/lib/llm-config-bootstrap"
 import { ProfileBootstrap } from "~/lib/profile-bootstrap"
 // CREMA:PROVIDERS-IMPORTS
diff --git a/app/routes.ts b/app/routes.ts
index 360e256..c3050ce 100644
--- a/app/routes.ts
+++ b/app/routes.ts
@@ -2,10 +2,9 @@ import { type RouteConfig, index, route } from "@react-router/dev/routes"
 
 export default [
   index("routes/home.tsx"),
-  route("activity", "routes/activity.tsx"),
-  route("assistant", "routes/assistant.tsx"),
+  route("audit-log", "routes/activity.tsx"),
+  route("activity", "routes/activity-redirect.tsx"),
   route("ai", "routes/ai.tsx"),
-  route("library", "routes/library.tsx"),
   route("settings", "routes/settings.tsx"),
   route("profile", "routes/profile.tsx"),
   route("login", "routes/login.tsx"),
@@ -14,6 +13,7 @@ export default [
   route("login/2fa", "routes/login.2fa.tsx"),
   route("signup", "routes/signup.tsx"),
   route("tenants", "routes/tenants.tsx"),
+  route("tenants/:id", "routes/tenants.$id.tsx"),
   route("storage", "routes/storage.tsx"),
   route("users", "routes/users.tsx"),
   route("secrets", "routes/secrets.tsx"),
@@ -28,9 +28,8 @@ export default [
   route("announcements", "routes/announcements.tsx"),
   route("status-page", "routes/status-page.tsx"),
   route("search", "routes/search.tsx"),
-  route("apps", "routes/apps.tsx"),
-  route("plan", "routes/plan.tsx"),
-  route("entitlements", "routes/entitlements.tsx"),
+  route("billing", "routes/billing.tsx"),
+  route("feature-flags", "routes/feature-flags.tsx"),
   route("integrations", "routes/integrations.tsx"),
   // CREMA:ROUTES
 ] satisfies RouteConfig
diff --git a/app/routes/activity-redirect.tsx b/app/routes/activity-redirect.tsx
new file mode 100644
index 0000000..82d9a43
--- /dev/null
+++ b/app/routes/activity-redirect.tsx
@@ -0,0 +1,13 @@
+// The audit log now lives at /audit-log — the nav label and the URL finally
+// agree. This keeps old /activity links (bookmarks, deep links) working.
+// SPA build (ssr:false), so the redirect must run in the browser: clientLoader,
+// not loader (a plain loader never executes when there's no server).
+import { redirect } from "react-router"
+
+export function clientLoader() {
+  return redirect("/audit-log")
+}
+
+export default function ActivityRedirect() {
+  return null
+}
diff --git a/app/routes/activity.tsx b/app/routes/activity.tsx
index e2234c8..24e4e89 100644
--- a/app/routes/activity.tsx
+++ b/app/routes/activity.tsx
@@ -1,7 +1,7 @@
 import { useCallback, useEffect, useMemo, useState } from "react"
 import { Activity, Eye, RefreshCw } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
 import {
   ActionsCell,
   BadgeCell,
@@ -13,9 +13,10 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState } from "~/components/data-state"
 import { Button } from "~/components/ui/button"
 import {
   Card,
@@ -57,7 +58,9 @@ export default function ActivityRoute() {
 
   const [logs, setLogs] = useState<AuditLog[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
+  // The raw thrown value. `DataState` turns it into plain language — and a 429
+  // must never be mistaken for "no events match those filters".
+  const [error, setError] = useState<unknown>(null)
   const [search, setSearch] = useState("")
   const [severityFilter, setSeverityFilter] = useState<"all" | AuditSeverity>("all")
   const [resourceFilter, setResourceFilter] = useState("")
@@ -78,7 +81,7 @@ export default function ActivityRoute() {
       })
       setLogs(list)
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load audit logs.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -223,12 +226,6 @@ export default function ActivityRoute() {
           </Button>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-
         <Card>
           <CardHeader className="flex flex-col gap-3 lg:flex-row lg:flex-wrap lg:items-end">
             <SearchInput
@@ -300,34 +297,38 @@ export default function ActivityRoute() {
           </CardHeader>
 
           <CardContent className="relative p-0">
-            <LoadingOverlay active={loading && logs.length === 0} label="Loading audit log…" />
-            {table.total === 0 && !loading ? (
-              <EmptyState
-                icon={<Activity className="size-6" />}
-                title="No events match those filters."
-                description="Loosen the filter set or wait for new platform activity."
-                className="py-12"
+            <DataState
+              loading={loading}
+              error={error}
+              isEmpty={table.total === 0}
+              onRetry={refresh}
+              loadingLabel="Loading audit log…"
+              empty={
+                <EmptyState
+                  icon={<Activity className="size-6" />}
+                  title="No events match those filters."
+                  description="Loosen the filter set or wait for new platform activity."
+                  className="py-12"
+                />
+              }
+            >
+              <DataTable
+                columns={columns}
+                rows={table.pageRows}
+                getRowId={(l) => l.id}
+                sort={table.sort}
+                onSortToggle={table.toggleSort}
+                loading={loading && logs.length > 0}
+                stickyHeader
               />
-            ) : (
-              <>
-                <DataTable
-                  columns={columns}
-                  rows={table.pageRows}
-                  getRowId={(l) => l.id}
-                  sort={table.sort}
-                  onSortToggle={table.toggleSort}
-                  loading={loading && logs.length > 0}
-                  stickyHeader
-                />
-                <Pagination
-                  page={table.page}
-                  pageSize={table.pageSize}
-                  total={table.total}
-                  onPageChange={table.setPage}
-                  onPageSizeChange={table.setPageSize}
-                />
-              </>
-            )}
+              <Pagination
+                page={table.page}
+                pageSize={table.pageSize}
+                total={table.total}
+                onPageChange={table.setPage}
+                onPageSizeChange={table.setPageSize}
+              />
+            </DataState>
           </CardContent>
         </Card>
       </div>
@@ -406,3 +407,5 @@ function countBy<T>(arr: T[], key: (x: T) => string): Record<string, number> {
     return acc
   }, {})
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/ai.tsx b/app/routes/ai.tsx
index 5c68152..8d20095 100644
--- a/app/routes/ai.tsx
+++ b/app/routes/ai.tsx
@@ -67,7 +67,7 @@ import {
 import { addLibraryItem } from "~/lib/library"
 import { Avatar, AvatarFallback } from "~/components/ui/avatar"
 import { pageTitle } from "~/lib/page-meta"
-import { useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
 import type { Message as LLMMessage, ToolCall } from "@crema/llm-ui"
 // Shape of a single hit returned by the `search_docs` tool. Defined here
 // rather than imported from the lib because the tool wrapper in
@@ -2371,3 +2371,5 @@ function VoiceInputButton({
     </button>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/announcements.tsx b/app/routes/announcements.tsx
index b626a96..c5739d9 100644
--- a/app/routes/announcements.tsx
+++ b/app/routes/announcements.tsx
@@ -7,7 +7,8 @@ import {
   Trash2,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -20,9 +21,14 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+// AlertBanner is imported for the *preview* below — it is the very component
+// the published announcement renders as in every Sky AI app. It is no longer
+// used to report errors or successes; those are DataState / DialogError / toasts.
+import { AlertBanner, ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
 import {
@@ -110,12 +116,13 @@ type Editor =
 export default function AnnouncementsRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
   const [items, setItems] = useState<Announcement[]>([])
   const [tenants, setTenants] = useState<Tenant[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // Raw thrown value — `DataState` normalises it. Successes are toasts now.
+  const [error, setError] = useState<unknown>(null)
   const [search, setSearch] = useState("")
   const [editor, setEditor] = useState<Editor>(null)
   const [pendingDelete, setPendingDelete] = useState<Announcement | null>(null)
@@ -128,13 +135,16 @@ export default function AnnouncementsRoute() {
     try {
       const [a, t] = await Promise.all([
         listAnnouncements(arcadia),
+        // Tenants only label the audience column and fill the scope picker.
+        // Losing them degrades those two spots; it doesn't make the
+        // announcements list wrong, so it must not fail the whole screen.
         listTenants(arcadia).catch(() => [] as Tenant[]),
       ])
       setItems(a)
       setTenants(t)
       setRefreshedAt(Date.now())
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load announcements.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -237,10 +247,17 @@ export default function AnnouncementsRoute() {
               onSelect: async () => {
                 try {
                   await updateAnnouncement(arcadia, a.id, { active: !a.active })
-                  setInfo(a.active ? "Announcement deactivated." : "Announcement activated.")
                   await refresh()
+                  toast.success(
+                    a.active ? `Deactivated "${a.title}"` : `Activated "${a.title}"`,
+                  )
                 } catch (err) {
-                  setError(err instanceof ArcadiaError ? err.message : "Toggle failed.")
+                  toast.error(
+                    errorMessage(
+                      err,
+                      `${a.active ? "deactivate" : "activate"} "${a.title}"`,
+                    ),
+                  )
                 }
               },
             },
@@ -257,7 +274,7 @@ export default function AnnouncementsRoute() {
         },
       },
     ],
-    [arcadia, refresh, tenants],
+    [arcadia, refresh, tenants, toast],
   )
 
   const summary = useMemo(
@@ -329,17 +346,6 @@ export default function AnnouncementsRoute() {
           </div>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Card>
           <CardHeader className="flex flex-row items-center gap-3">
             <SearchInput
@@ -359,74 +365,75 @@ export default function AnnouncementsRoute() {
           </CardHeader>
 
           <CardContent className="relative p-0">
-            <LoadingOverlay
-              active={loading && items.length === 0}
-              label="Loading announcements…"
-            />
-            {table.total === 0 && !loading ? (
-              <EmptyState
-                icon={
-                  <div
-                    className="grid size-14 place-items-center rounded-full"
-                    style={{
-                      background:
-                        "radial-gradient(circle at center, color-mix(in oklch, var(--primary) 22%, transparent), transparent 70%)",
-                    }}
-                  >
-                    <Megaphone
-                      className="size-6"
-                      style={{ color: "var(--primary)" }}
-                    />
-                  </div>
-                }
-                title={search ? "No announcements match." : "No announcements yet."}
-                description={
-                  search
-                    ? "Try a different search."
-                    : "Post your first banner. Show it to everyone, or scope it to a single tenant."
-                }
-                action={
-                  search ? (
-                    <Button
-                      size="sm"
-                      variant="outline"
-                      onClick={() => setSearch("")}
-                      data-action="announcements-clear-search"
+            <DataState
+              loading={loading}
+              error={error}
+              isEmpty={table.total === 0}
+              onRetry={refresh}
+              loadingLabel="Loading announcements…"
+              empty={
+                <EmptyState
+                  icon={
+                    <div
+                      className="grid size-14 place-items-center rounded-full"
+                      style={{
+                        background:
+                          "radial-gradient(circle at center, color-mix(in oklch, var(--primary) 22%, transparent), transparent 70%)",
+                      }}
                     >
-                      Clear search
-                    </Button>
-                  ) : (
-                    <Button
-                      size="sm"
-                      onClick={() => setEditor({ kind: "create" })}
-                      data-action="announcements-create-empty"
-                    >
-                      <Plus className="size-4" />
-                      New announcement
-                    </Button>
-                  )
-                }
+                      <Megaphone
+                        className="size-6"
+                        style={{ color: "var(--primary)" }}
+                      />
+                    </div>
+                  }
+                  title={search ? "No announcements match." : "No announcements yet."}
+                  description={
+                    search
+                      ? "Try a different search."
+                      : "Post your first banner. Show it to everyone, or scope it to a single tenant."
+                  }
+                  action={
+                    search ? (
+                      <Button
+                        size="sm"
+                        variant="outline"
+                        onClick={() => setSearch("")}
+                        data-action="announcements-clear-search"
+                      >
+                        Clear search
+                      </Button>
+                    ) : (
+                      <Button
+                        size="sm"
+                        onClick={() => setEditor({ kind: "create" })}
+                        data-action="announcements-create-empty"
+                      >
+                        <Plus className="size-4" />
+                        New announcement
+                      </Button>
+                    )
+                  }
+                />
+              }
+            >
+              <DataTable
+                columns={columns}
+                rows={table.pageRows}
+                getRowId={(a) => a.id}
+                sort={table.sort}
+                onSortToggle={table.toggleSort}
+                loading={loading && items.length > 0}
+                stickyHeader
               />
-            ) : (
-              <>
-                <DataTable
-                  columns={columns}
-                  rows={table.pageRows}
-                  getRowId={(a) => a.id}
-                  sort={table.sort}
-                  onSortToggle={table.toggleSort}
-                  loading={loading && items.length > 0}
-                  stickyHeader
-                />
-                <Pagination
-                  page={table.page}
-                  pageSize={table.pageSize}
-                  total={table.total}
-                  onPageChange={table.setPage}
-                  onPageSizeChange={table.setPageSize}
-                />
-              </>
-            )}
+              <Pagination
+                page={table.page}
+                pageSize={table.pageSize}
+                total={table.total}
+                onPageChange={table.setPage}
+                onPageSizeChange={table.setPageSize}
+              />
+            </DataState>
           </CardContent>
         </Card>
       </div>
@@ -440,14 +447,15 @@ export default function AnnouncementsRoute() {
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const title = pendingDelete.title
           try {
             await deleteAnnouncement(arcadia, pendingDelete.id)
             setPendingDelete(null)
-            setInfo("Announcement deleted.")
             await refresh()
+            toast.success(`Deleted "${title}"`)
           } catch (err) {
-            setError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete "${title}"`))
           }
         }}
       />
@@ -458,10 +466,9 @@ export default function AnnouncementsRoute() {
         onClose={() => setEditor(null)}
         onSaved={async (msg) => {
           setEditor(null)
-          if (msg) setInfo(msg)
           await refresh()
+          toast.success(msg)
         }}
-        onError={setError}
       />
     </AppShell>
   )
@@ -487,13 +494,11 @@ function AnnouncementEditorDialog({
   tenants,
   onClose,
   onSaved,
-  onError,
 }: {
   state: Editor
   tenants: Tenant[]
   onClose: () => void
-  onSaved: (msg?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (msg: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
@@ -512,7 +517,9 @@ function AnnouncementEditorDialog({
   const [dismissible, setDismissible] = useState(true)
   const [active, setActive] = useState(true)
   const [saving, setSaving] = useState(false)
-  const [localError, setLocalError] = useState<string | null>(null)
+  // A failed publish speaks inside the dialog, right above the button that was
+  // pressed. Hoisting it to a page banner would put it behind the modal scrim.
+  const [localError, setLocalError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!open) setLocalError(null)
@@ -548,7 +555,6 @@ function AnnouncementEditorDialog({
   }, [open, initial])
 
   const submit = async () => {
-    onError(null)
     setLocalError(null)
     setSaving(true)
     try {
@@ -567,19 +573,17 @@ function AnnouncementEditorDialog({
       }
       if (isEdit && initial) {
         await updateAnnouncement(arcadia, initial.id, input)
-        await onSaved("Announcement updated.")
+        await onSaved(`Updated "${title}"`)
       } else {
         await createAnnouncement(arcadia, input)
-        await onSaved("Announcement posted.")
+        await onSaved(
+          active ? `Published "${title}"` : `Saved draft "${title}"`,
+        )
       }
     } catch (err) {
-      const msg =
-        err instanceof ArcadiaError
-          ? err.message
-          : err instanceof Error
-            ? err.message
-            : "Save failed."
-      setLocalError(msg)
+      // Keep the dialog open with the form intact so the operator can fix and
+      // resubmit without retyping the whole banner.
+      setLocalError(err)
     } finally {
       setSaving(false)
     }
@@ -630,16 +634,6 @@ function AnnouncementEditorDialog({
           </div>
         </div>
 
-        {localError ? (
-          <AlertBanner
-            variant="error"
-            dismissible
-            onDismiss={() => setLocalError(null)}
-          >
-            {localError}
-          </AlertBanner>
-        ) : null}
-
         <div className="grid grid-cols-2 gap-3">
           <div className="col-span-2 flex flex-col gap-1.5">
             <Label htmlFor="ann-title">Title</Label>
@@ -784,6 +778,13 @@ function AnnouncementEditorDialog({
           </div>
         </div>
 
+        {localError ? (
+          <DialogError
+            error={localError}
+            context={isEdit ? "save the announcement" : "publish the announcement"}
+          />
+        ) : null}
+
         <DialogFooter className="flex-col items-stretch gap-3 sm:flex-row sm:items-center sm:justify-between">
           {/* Active = publish state, paired with the publish button. */}
           <label
@@ -821,3 +822,5 @@ function AnnouncementEditorDialog({
     </Dialog>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/apps.tsx b/app/routes/apps.tsx
deleted file mode 100644
index e764cc8..0000000
--- a/app/routes/apps.tsx
+++ /dev/null
@@ -1,44 +0,0 @@
-// Tenant-scoped "Apps" — placeholder. Real surface is the apps this
-// tenant publishes (and their per-app users/grants on the personal
-// cloud side). Wired into the nav so tenant admins see the route they
-// expect; data layer follows.
-
-import { LayoutGrid } from "lucide-react"
-import { AppShell } from "~/components/layout/app-shell"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-} from "~/components/ui/card"
-
-export default function AppsRoute() {
-  return (
-    <AppShell>
-      <div className="flex items-center gap-3">
-        <div className="flex size-10 items-center justify-center rounded-lg bg-primary/10 text-primary">
-          <LayoutGrid className="size-5" />
-        </div>
-        <div>
-          <h1 className="text-2xl font-semibold">Apps</h1>
-          <p className="text-sm text-muted-foreground">
-            Apps this tenant publishes — and the users that have granted them
-            access to their personal clouds.
-          </p>
-        </div>
-      </div>
-      <Card>
-        <CardHeader>
-          <CardTitle>Coming soon</CardTitle>
-          <CardDescription>
-            App authoring lives in arcadia-agents-manager today. This view will
-            surface published apps + per-app grants once the catalog endpoint
-            is wired.
-          </CardDescription>
-        </CardHeader>
-        <CardContent />
-      </Card>
-    </AppShell>
-  )
-}
diff --git a/app/routes/assistant.tsx b/app/routes/assistant.tsx
deleted file mode 100644
index 05c6510..0000000
--- a/app/routes/assistant.tsx
+++ /dev/null
@@ -1,2317 +0,0 @@
-import { useCallback, useEffect, useMemo, useRef, useState } from "react"
-import {
-  RefreshCw,
-  Square,
-  Archive,
-  Loader2,
-  MoreHorizontal,
-  Wand2,
-  Trash2,
-  RotateCcw,
-  ArrowRight,
-  Undo2,
-  Copy,
-  Download,
-  FileText,
-  Pin,
-  Pencil,
-  Volume2,
-  VolumeX,
-  Mic,
-  MicOff,
-  Plus,
-  MessagesSquare,
-  BookmarkPlus,
-  Users,
-} from "lucide-react"
-
-const PROBE_TIMEOUT_MS = 3000
-
-// Static catalog of every data-action id wired into the app.
-// "Available actions" in the system prompt only lists what's on screen NOW;
-// this catalog tells the model what exists elsewhere so it can plan
-// multi-step flows (navigate → wait_for → fill → click) in a single block.
-// Rich-output protocol: typed fenced blocks the chat renderer turns into UI
-// from @crema/*-ui. The system prompt only carries a thin INDEX (kind →
-// one-line purpose) — full schemas live in app/lib/block-schemas.ts and are
-// fetched on demand via the get_block_schema tool. Adding a new block kind
-// = edit block-schemas.ts + the renderer; no prompt edit required.
-import { blockIndexForPrompt } from "~/lib/block-schemas"
-const RICH_OUTPUT_PREFACE = blockIndexForPrompt()
-
-
-const UI_CONTROL_PREFACE = `You are the operator's assistant inside Arcadia Admin — the platform-admin web app for the Arcadia multi-tenant SaaS backend (Phoenix, /api/v1). The signed-in user is a platform administrator. Help them inspect and manage tenants, users, billing, audit logs, feature flags, and other platform surfaces.
-
-You can both answer factual questions about the current state (use the "Admin context" block below) and drive the UI. A virtual cursor is shown to the user — every step should target an element so the cursor visibly moves.
-
-Rules:
-- Prefer \`click nav-<page>\` (e.g. \`click nav-settings\`) over \`navigate <path>\` so the user sees the cursor travel to the sidebar.
-- When a step lands on a new page, follow it with \`wait_for <id>\` for an element on that page before the next step (it will appear once the page mounts).
-- Combine multi-step requests into ONE action block. Quote string values.
-- ALWAYS end an action block by returning the user to the Assistant page so the conversation continues there. Append \`click nav-assistant\` as the final step (and \`wait_for assistant-ui-control\` after it) UNLESS the task itself is on the Assistant page.
-- Prefer doing over describing. Keep prose to one short sentence; put commands in the block.
-
-Known action ids across the app (use these even if not in "Available actions" — the page may not be mounted yet):
-
-Sidebar / nav: nav-overview, nav-tenants, nav-resources, nav-activity, nav-search, nav-assistant, nav-library, nav-settings, sidebar-toggle, mobile-nav-toggle
-Appbar: appbar-search (input), appbar-scripts, appbar-font-size, appbar-surface, appbar-background, theme-toggle, appbar-notifications, appbar-avatar
-Account menu (after click appbar-avatar): avatar-profile (→ /profile), avatar-settings, avatar-help, avatar-signout
-Profile page: profile-avatar-upload, profile-avatar-remove, profile-name, profile-email, profile-title, profile-bio, profile-signature, profile-default-agent, profile-save, profile-revert, profile-reset
-Overview tiles: home-tile-assistant, home-tile-resources, home-tile-activity, home-tile-library
-Settings page: settings-base-url (input, fill with URL), settings-context-tokens (number input), settings-response-budget (number input), settings-system-prompt (textarea), settings-system-prompt-reset, settings-save, settings-test, settings-reset
-Settings sub-nav: settings-section-llm, settings-section-agents, settings-section-appearance, settings-section-account, settings-section-about
-Agents settings: settings-agent-new, settings-agent-reset, settings-agent-activate-<id>, settings-agent-edit-<id>, settings-agent-delete-<id>, settings-agent-name-<id>, settings-agent-role-<id>, settings-agent-prompt-<id>
-Assistant agent picker: assistant-agent (dropdown — click to switch persona)
-Assistant page: assistant-model, assistant-agent, assistant-thread, assistant-thread-new, assistant-thread-switch-<id>, assistant-thread-rename-<id>, assistant-thread-delete-<id>, assistant-ui-control, assistant-compact, assistant-restore-compact, assistant-regenerate, assistant-continue, assistant-show-prompt, assistant-copy-md, assistant-export-md, assistant-save-library, assistant-compare, assistant-handoff-<id>, assistant-stop, assistant-clear, assistant-retry-probe, assistant-actions (open the kebab popover first to reveal the rest), assistant-voice (mic), assistant-msg-pin-<i>, assistant-msg-edit-<i>, assistant-msg-speak-<i>
-Library page: library-search, library-open-<id>, library-copy-<id>, library-download-<id>, library-delete-<id>
-Resources page: resources-search, resources-new-name, resources-create, resources-status-<id>, resources-delete-<id>
-Tenants page: tenants-refresh, tenants-search (input), tenants-create. Per-row (use the tenant's slug — see the "tenants" surface in Admin context for available slugs): tenant-<slug>-actions (open the kebab first), tenant-<slug>-suspend, tenant-<slug>-activate, tenant-<slug>-deactivate. Recipe to suspend a tenant: click nav-tenants, wait_for tenants-refresh, click tenant-<slug>-actions, wait_for tenant-<slug>-suspend, click tenant-<slug>-suspend.
-Search page (/search — manage arcadia-search tenants and corpora): search-refresh, search-restart (with confirm), search-new-tenant, search-new-corpus, corpora-search (input). Per-tenant chip: tenant-<id>-delete. Per-corpus row (id is "<tenant>-<corpus>"): corpus-<tenant>-<corpus>-actions (kebab), corpus-<tenant>-<corpus>-rebuild, corpus-<tenant>-<corpus>-edit, corpus-<tenant>-<corpus>-delete. New-tenant dialog: tenant-form-id (input), tenant-form-cancel, tenant-form-save. New/edit-corpus dialog: corpus-form-tenant (select, only when creating), corpus-form-config (textarea, JSON), corpus-form-cancel, corpus-form-save. Recipe to rebuild a corpus: click nav-search, wait_for search-refresh, click corpus-<tenant>-<corpus>-actions, wait_for corpus-<tenant>-<corpus>-rebuild, click corpus-<tenant>-<corpus>-rebuild. (NOTE: prefer the \`rebuild_search_corpus\` tool over UI-driving for rebuilds — it's atomic and gives a structured result; UI-drive only when the user explicitly wants to see it happen.)
-Login page: login-email, login-password, login-submit
-Notifications popover: appbar-notifications (open), notif-mark-all-read, notif-clear, notif-open-<id>, notif-dismiss-<id>
-Create a notification (hidden bridge — always available, even when not visible): fill the four hidden inputs, then click the submit button. Recipe:
-  fill notif-title "Reminder"
-  fill notif-body "Take a 5-minute break"
-  fill notif-kind "info"           # info | success | warning | error
-  fill notif-href "/library"       # optional, omit if no link
-  click notif-create
-Use this any time the user asks you to remind them, leave a note, flag something, or queue an item — drop a notification.
-
-Example — User: "Go to settings and set the response cap to 1024" →
-"On it.
-
-\`\`\`action
-click nav-settings
-wait_for settings-response-budget
-fill settings-response-budget "1024"
-click settings-save
-click nav-assistant
-wait_for assistant-ui-control
-\`\`\`"`
-
-
-import { formatContextForPrompt } from "@crema/aifirst-ui/context"
-import {
-  buildDenialMessages,
-  classifyCalls,
-  getOpenAITools,
-  runLLMToolCalls,
-} from "~/lib/admin-tools"
-import { ARCADIA_KNOWLEDGE } from "~/lib/arcadia-knowledge"
-import { useArcadiaClient } from "@crema/arcadia-client"
-import { ConfirmCard } from "~/components/assistant/confirm-card"
-import type { ToolCall } from "@crema/llm-ui"
-
-/**
- * Always includes domain knowledge + tools + admin context + persona.
- * Adds the UI-control DSL/action catalog only when uiControl is on (those rules
- * are about driving the cursor, irrelevant when the assistant is in plain Q&A).
- */
-function buildAdminPreface(activeAgent: Agent | undefined, uiControl: boolean): string {
-  const persona = activeAgent
-    ? `Active persona: ${activeAgent.name} — ${activeAgent.role}\n${activeAgent.prompt}`
-    : ""
-  const ctx = formatContextForPrompt()
-  const parts = [
-    "You are the operator's assistant inside Arcadia Admin. Be precise and direct. You have native function tools attached to this conversation — call them whenever the user asks about live platform state (counts, statuses, listings, lookups). Never invent tenant slugs, user counts, or statuses; if you need data, call a tool.",
-    "Two retrieval surfaces exist for documentation/knowledge: `search_docs` (browser-side, BM25 over the bundled arcadia docs — fast, always available, small corpus) and `search_kb` (server-side, BM25 over arcadia-search — `docs` (arcadia parity), `operator-tools` (arcadia-search + arcadia-admin admin docs), `files` (uploaded files), plus any custom corpora the operator adds via /search). For questions about the bundled arcadia docs either is fine; prefer `search_kb` for richer hits or for content outside the bundled docs (uploaded files, the admin tooling itself, tenant-specific knowledge). If unsure what corpora exist, call `list_search_corpora`. When `search_kb` returns a chunk_id you want to expand, call `read_chunk(chunk_id, corpus)`. When the operator says results look stale or after they've uploaded new files, call `rebuild_search_corpus(tenant, corpus)`.",
-    RICH_OUTPUT_PREFACE,
-    ARCADIA_KNOWLEDGE,
-    persona,
-    ctx,
-  ]
-  if (uiControl) parts.push(UI_CONTROL_PREFACE)
-  return parts.filter(Boolean).join("\n\n")
-}
-
-function withTimeout<T>(p: Promise<T>, ms: number, signal: AbortSignal): Promise<T> {
-  return new Promise<T>((resolve, reject) => {
-    const t = setTimeout(() => {
-      reject(new Error(`timeout after ${ms}ms`))
-    }, ms)
-    signal.addEventListener("abort", () => {
-      clearTimeout(t)
-      reject(new DOMException("Aborted", "AbortError"))
-    })
-    p.then(
-      (v) => {
-        clearTimeout(t)
-        resolve(v)
-      },
-      (e) => {
-        clearTimeout(t)
-        reject(e)
-      },
-    )
-  })
-}
-import {
-  LLMProvider,
-  MockLLM,
-  listModels,
-  useChat,
-  useCompletion,
-  type LLMAdapter,
-} from "@crema/llm-ui"
-import { TypingIndicator } from "@crema/chat-ui"
-import { CommandBar } from "@crema/aifirst-ui"
-
-import { AppShell } from "~/components/layout/app-shell"
-import { MessageBody } from "~/components/assistant/message-body"
-import { Button } from "~/components/ui/button"
-import {
-  buildSystemPrompt,
-  estimateTokens,
-  runActionBlocks,
-  trimMessages,
-} from "@crema/action-bus"
-import {
-  buildAdapter,
-  getProvider,
-  useSettings as useProviderSettings,
-} from "@crema/llm-providers-ui"
-import {
-  composeSystemPrompt,
-  loadActiveAgentId,
-  saveActiveAgentId,
-  useAgents,
-  type Agent,
-} from "~/lib/agents"
-import {
-  clearThreadSnapshot,
-  createThread,
-  deleteThread,
-  deriveTitleFromFirstMessage,
-  ensureThread,
-  loadThreadSnapshot,
-  saveActiveThreadId,
-  snapshotThread,
-  updateThread,
-  useThreads,
-  type Thread,
-  type ThreadMessage,
-} from "~/lib/threads"
-import { addLibraryItem } from "~/lib/library"
-import { pageTitle } from "~/lib/page-meta"
-import {
-  DropdownMenu,
-  DropdownMenuContent,
-  DropdownMenuItem,
-  DropdownMenuTrigger,
-} from "~/components/ui/dropdown-menu"
-import { ChevronDown } from "lucide-react"
-import { Avatar, AvatarFallback } from "~/components/ui/avatar"
-import {
-  Popover,
-  PopoverContent,
-  PopoverTrigger,
-} from "~/components/ui/popover"
-
-export const meta = () => pageTitle("Assistant")
-
-const STORAGE_KEY = "crema.assistant.model"
-const UI_CONTROL_KEY = "crema.assistant.uiControl"
-type StoredMessage = { role: "user" | "assistant"; content: string }
-
-type PendingAction = { kind: "retry"; text: string } | null
-
-type Status =
-  | { kind: "probing" }
-  | { kind: "live"; models: string[] }
-  | { kind: "mock"; reason: string }
-
-const mockAdapter = new MockLLM({
-  label: "Mock",
-  delayMs: 18,
-  fallback:
-    "I'm a stand-in for the local model. Start LM Studio at localhost:1234 and reload to swap me out.",
-  responses: [
-    {
-      matches: (req) =>
-        /hello|hi\b|hey/i.test(req.messages.at(-1)?.content ?? ""),
-      response:
-        "Hi — I'm the mock assistant. Try asking me anything; I'll stream a generic reply.",
-    },
-    {
-      matches: (req) =>
-        /(take me to|open|navigate|go to).*(tenants|users|library|settings|activity|assistant|overview|home)/i.test(
-          req.messages.at(-1)?.content ?? "",
-        ),
-      response: [
-        "On it.\n\n",
-        "```action\n",
-        "navigate /tenants\n",
-        "```\n",
-      ],
-    },
-  ],
-})
-
-export default function AssistantRoute() {
-  const settings = useProviderSettings()
-  const arcadia = useArcadiaClient()
-  const provider = getProvider(settings.providerId)
-  const agents = useAgents()
-  const threads = useThreads()
-  const [status, setStatus] = useState<Status>({ kind: "probing" })
-  const [model, setModel] = useState<string>(() => {
-    if (typeof window === "undefined") return "mock"
-    return localStorage.getItem(STORAGE_KEY) ?? ""
-  })
-  const [compactNonce, setCompactNonce] = useState(0)
-  const [pendingAction, setPendingAction] = useState<PendingAction>(null)
-  const remount = useCallback(() => setCompactNonce((n) => n + 1), [])
-
-  // Ensure at least one thread exists, and resolve the active one.
-  const fallbackAgentId =
-    loadActiveAgentId() || agents[0]?.id || ""
-  const ensured = useMemo(
-    () => ensureThread(threads, fallbackAgentId),
-    [threads, fallbackAgentId],
-  )
-  const activeThreadId = ensured.activeId
-  const activeThread =
-    ensured.threads.find((t) => t.id === activeThreadId) ?? ensured.threads[0]
-
-  const switchThread = useCallback(
-    (id: string) => {
-      saveActiveThreadId(id)
-      remount()
-    },
-    [remount],
-  )
-
-  const newConversation = useCallback(() => {
-    const agentId = activeThread?.agentId || fallbackAgentId
-    createThread(agentId)
-    remount()
-  }, [activeThread, fallbackAgentId, remount])
-
-  const removeThread = useCallback(
-    (id: string) => {
-      deleteThread(id)
-      remount()
-    },
-    [remount],
-  )
-
-  const renameThread = useCallback((id: string, title: string) => {
-    updateThread(id, { title })
-  }, [])
-
-  const [adapter, setAdapter] = useState<LLMAdapter>(mockAdapter)
-
-  // When the user switches providers in /settings, follow.
-  useEffect(() => {
-    if (settings.model) setModel(settings.model)
-  }, [settings.providerId, settings.model])
-
-  const probe = useCallback(() => {
-    const ac = new AbortController()
-    setStatus({ kind: "probing" })
-
-    const resolveSecret = async (name: string): Promise<string> => {
-      const res = await arcadia.GET<{ data: { value: string } }>(
-        `/api/v1/secrets/${encodeURIComponent(name)}`,
-      )
-      return res.data.value
-    }
-    const arcadiaBaseURL =
-      (import.meta.env.VITE_ARCADIA_URL as string | undefined) ?? "http://localhost:4000"
-    const arcadiaTenantId =
-      (import.meta.env.VITE_ARCADIA_TENANT as string | undefined) ?? "default"
-    const arcadiaAuthToken =
-      typeof window !== "undefined"
-        ? sessionStorage.getItem("arcadia_access_token") ?? undefined
-        : undefined
-
-    ;(async () => {
-      try {
-        const a = await buildAdapter({
-          settings,
-          resolveSecret,
-          arcadiaBaseURL,
-          arcadiaAuthToken,
-          arcadiaTenantId,
-        })
-        setAdapter(a)
-      } catch {
-        setAdapter(mockAdapter)
-      }
-
-      // Anthropic has no /v1/models endpoint — use the catalog defaults.
-      if (provider.transport === "anthropic") {
-        const ids = provider.defaultModels.length
-          ? provider.defaultModels
-          : ["claude-opus-4-7"]
-        setStatus({ kind: "live", models: ids })
-        setModel((cur) => (cur && ids.includes(cur) ? cur : settings.model || ids[0]))
-        return
-      }
-
-      const baseURL = settings.baseURL || provider.baseURL
-      let apiKey: string | undefined
-      if (provider.requiresKey && settings.secretName) {
-        try {
-          apiKey = await resolveSecret(settings.secretName)
-        } catch {}
-      }
-
-      try {
-        const rows = await withTimeout(
-          listModels({ baseURL, apiKey, signal: ac.signal }),
-          PROBE_TIMEOUT_MS,
-          ac.signal,
-        )
-        const ids = rows.map((m) => m.id)
-        if (ids.length === 0) {
-          setStatus({ kind: "mock", reason: "endpoint returned no models" })
-          return
-        }
-        setStatus({ kind: "live", models: ids })
-        setModel((cur) => (cur && ids.includes(cur) ? cur : settings.model || ids[0]))
-      } catch (err: unknown) {
-        if ((err as DOMException)?.name === "AbortError") return
-        if (provider.defaultModels.length) {
-          setStatus({ kind: "live", models: provider.defaultModels })
-          setModel((cur) =>
-            cur && provider.defaultModels.includes(cur)
-              ? cur
-              : settings.model || provider.defaultModels[0],
-          )
-        } else {
-          setStatus({
-            kind: "mock",
-            reason: err instanceof Error ? err.message : "endpoint unreachable",
-          })
-        }
-      }
-    })()
-
-    return () => ac.abort()
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [
-    arcadia,
-    settings.providerId,
-    settings.baseURL,
-    settings.secretName,
-    settings.mode,
-    settings.model,
-    provider.transport,
-    provider.baseURL,
-    provider.requiresKey,
-  ])
-
-  useEffect(() => probe(), [probe])
-
-  useEffect(() => {
-    if (model && model !== "mock") localStorage.setItem(STORAGE_KEY, model)
-  }, [model])
-
-  const activeModel =
-    status.kind === "live" ? model || status.models[0] : "mock"
-
-  return (
-    <AppShell>
-      <LLMProvider adapter={adapter} model={activeModel}>
-        <AssistantSurface
-          key={`${activeThreadId}-${compactNonce}`}
-          thread={activeThread}
-          threads={ensured.threads}
-          agents={agents}
-          status={status}
-          model={model}
-          onModelChange={setModel}
-          contextTokens={settings.contextTokens}
-          responseBudget={settings.responseBudget}
-          baseURL={settings.baseURL || provider.baseURL}
-          basePrompt={settings.systemPrompt}
-          onRetryProbe={probe}
-          onRemount={remount}
-          pendingAction={pendingAction}
-          onPendingActionConsumed={() => setPendingAction(null)}
-          onRequestRetry={(text) => {
-            setPendingAction({ kind: "retry", text })
-            remount()
-          }}
-          onSwitchThread={switchThread}
-          onNewThread={newConversation}
-          onDeleteThread={removeThread}
-          onRenameThread={renameThread}
-        />
-      </LLMProvider>
-    </AppShell>
-  )
-}
-
-function AssistantSurface({
-  status,
-  model,
-  onModelChange,
-  contextTokens,
-  responseBudget,
-  baseURL,
-  basePrompt,
-  onRetryProbe,
-  onRemount,
-  pendingAction,
-  onPendingActionConsumed,
-  onRequestRetry,
-  thread,
-  threads,
-  agents,
-  onSwitchThread,
-  onNewThread,
-  onDeleteThread,
-  onRenameThread,
-}: {
-  status: Status
-  model: string
-  onModelChange: (m: string) => void
-  contextTokens: number
-  responseBudget: number
-  baseURL: string
-  basePrompt: string
-  onRetryProbe: () => void
-  onRemount: () => void
-  pendingAction: PendingAction
-  onPendingActionConsumed: () => void
-  onRequestRetry: (text: string) => void
-  thread: Thread
-  threads: Thread[]
-  agents: Agent[]
-  onSwitchThread: (id: string) => void
-  onNewThread: () => void
-  onDeleteThread: (id: string) => void
-  onRenameThread: (id: string, title: string) => void
-}) {
-  // Active agent comes from the thread itself (per-thread persona).
-  const activeAgentId = thread.agentId || agents[0]?.id || ""
-  const setActiveAgentId = (id: string) => {
-    updateThread(thread.id, { agentId: id })
-    saveActiveAgentId(id)
-  }
-  const activeAgent: Agent | undefined =
-    agents.find((a) => a.id === activeAgentId) ?? agents[0]
-  const systemPrompt = composeSystemPrompt(basePrompt, activeAgent)
-  const [uiControl, setUiControl] = useState<boolean>(() => {
-    if (typeof window === "undefined") return false
-    return localStorage.getItem(UI_CONTROL_KEY) === "1"
-  })
-  const [actionLog, setActionLog] = useState<string | null>(null)
-  const [showUiControlBanner, setShowUiControlBanner] = useState(false)
-
-  useEffect(() => {
-    localStorage.setItem(UI_CONTROL_KEY, uiControl ? "1" : "0")
-  }, [uiControl])
-
-  useEffect(() => {
-    if (!uiControl) {
-      setShowUiControlBanner(false)
-      return
-    }
-    setShowUiControlBanner(true)
-    const t = setTimeout(() => setShowUiControlBanner(false), 6000)
-    return () => clearTimeout(t)
-  }, [uiControl])
-
-  // Always-on admin system prompt — domain primer + tools + persona, regardless
-  // of UI Control. Per-call `send(text, {system})` overrides may not always be
-  // honored across hook re-renders, so anchor it at construction too.
-  const constructorSystemPrompt = buildSystemPrompt({
-    path: typeof window !== "undefined" ? window.location.pathname : "",
-    preface: buildAdminPreface(activeAgent, uiControl),
-    includeActions: uiControl,
-  })
-
-  const { messages, send, continueChat, abort, isStreaming, error, reset } = useChat({
-    system: constructorSystemPrompt,
-    initialMessages: thread.messages as StoredMessage[],
-  })
-
-  // Persist conversation back into the active thread.
-  // Preserve any agentId already stamped on prior messages, and stamp newly
-  // appended assistant messages with the *currently active* agent.
-  useEffect(() => {
-    if (isStreaming) return
-    const stamped: ThreadMessage[] = messages.map((m, i) => {
-      const prior = thread.messages[i]
-      if (m.role === "user") return { role: "user", content: m.content }
-      if (m.role === "tool") {
-        return {
-          role: "tool",
-          content: m.content,
-          toolCallId: m.toolCallId,
-          name: m.name,
-        }
-      }
-      const agentId = prior?.agentId ?? activeAgentId
-      return {
-        role: "assistant",
-        content: m.content,
-        agentId,
-        ...(m.toolCalls ? { toolCalls: m.toolCalls } : {}),
-      }
-    })
-    updateThread(thread.id, {
-      messages: stamped,
-      ...(thread.title === "New conversation" &&
-      messages[0]?.role === "user"
-        ? { title: deriveTitleFromFirstMessage(messages[0].content) }
-        : {}),
-    })
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [messages, isStreaming])
-
-  const clearConversation = useCallback(() => {
-    updateThread(thread.id, { messages: [], pinned: [] })
-    onRemount()
-  }, [thread.id, onRemount])
-
-  const { complete: completeOneShot, isLoading: compacting } = useCompletion()
-  const compactConversation = useCallback(async () => {
-    if (compacting || isStreaming || messages.length < 2) return
-    const transcript = messages
-      .map(
-        (m) =>
-          `${m.role === "user" ? "User" : "Assistant"}: ${m.content.trim()}`,
-      )
-      .join("\n\n")
-    const summarySystem =
-      "You compress conversations. Output a tight 1–2 paragraph summary that preserves: user goals, key facts, names, decisions, file paths, code snippets, and unfinished tasks. Use third person ('the user wants X'). No commentary, no preamble, no markdown headings."
-    try {
-      const summary = await completeOneShot(
-        [
-          { role: "system", content: summarySystem },
-          {
-            role: "user",
-            content: `Summarize this conversation:\n\n${transcript}`,
-          },
-        ],
-        { maxTokens: Math.min(800, responseBudget * 2) },
-      )
-      const condensed: StoredMessage[] = [
-        {
-          role: "assistant",
-          content: `📋 **Conversation summary** (older turns compacted)\n\n${summary.trim()}`,
-        },
-      ]
-      // Snapshot the pre-compact thread so Restore can undo this.
-      snapshotThread(thread.id)
-      // Compact preserves pinned messages verbatim AFTER the summary line.
-      const pinned = thread.pinned
-        .map((idx) => messages[idx])
-        .filter(Boolean) as StoredMessage[]
-      const next: ThreadMessage[] = [
-        ...condensed,
-        ...pinned.map((m) => ({ ...m })),
-      ]
-      updateThread(thread.id, {
-        messages: next,
-        pinned: pinned.map((_, i) => condensed.length + i),
-      })
-      setActionLog(`Compacted ${messages.length} turns → 1 summary.`)
-      onRemount()
-    } catch (e) {
-      setActionLog(
-        `Compact failed: ${e instanceof Error ? e.message : String(e)}`,
-      )
-    }
-  }, [
-    compacting,
-    isStreaming,
-    messages,
-    completeOneShot,
-    responseBudget,
-    onRemount,
-  ])
-
-  const restoreCompact = useCallback(() => {
-    const snap = loadThreadSnapshot(thread.id)
-    if (!snap) {
-      setActionLog("Nothing to restore.")
-      return
-    }
-    updateThread(thread.id, {
-      messages: snap.messages,
-      pinned: snap.pinned,
-    })
-    clearThreadSnapshot(thread.id)
-    setActionLog(`Restored ${snap.messages.length} turns.`)
-    onRemount()
-  }, [thread.id, onRemount])
-
-  const regenerateLast = useCallback(() => {
-    // Find last user message; remove it + everything after; let parent
-    // re-mount us with that text as a pending retry.
-    let lastUserIdx = -1
-    for (let i = messages.length - 1; i >= 0; i--) {
-      if (messages[i].role === "user") {
-        lastUserIdx = i
-        break
-      }
-    }
-    if (lastUserIdx === -1) {
-      setActionLog("No user message to regenerate.")
-      return
-    }
-    const text = messages[lastUserIdx].content
-    const truncated = messages.slice(0, lastUserIdx) as ThreadMessage[]
-    updateThread(thread.id, {
-      messages: truncated,
-      pinned: thread.pinned.filter((idx) => idx < lastUserIdx),
-    })
-    onRequestRetry(text)
-  }, [messages, onRequestRetry, thread.id, thread.pinned])
-
-  const handleSendRef = useRef<((t: string) => void) | null>(null)
-  const arcadia = useArcadiaClient()
-  const toolIterationsRef = useRef(0)
-  const processedTurnRef = useRef(-1)
-  const prevStreamingRef = useRef(isStreaming)
-  const MAX_TOOL_ITERATIONS = 3
-
-  // Auto tool-loop using native function calls. Reads run automatically;
-  // writes are held in `pendingConfirm` until the operator clicks Confirm
-  // or Deny in the inline ConfirmCard.
-  const [pendingConfirm, setPendingConfirm] = useState<{
-    afterIndex: number
-    writes: ToolCall[]
-    readMessages: { role: "tool"; content: string; toolCallId: string; name: string }[]
-  } | null>(null)
-  const [confirmBusy, setConfirmBusy] = useState(false)
-
-  useEffect(() => {
-    const justFinished = prevStreamingRef.current && !isStreaming
-    prevStreamingRef.current = isStreaming
-    if (!justFinished) return
-
-    const lastIdx = messages.length - 1
-    if (lastIdx < 0) return
-    const last = messages[lastIdx]
-    if (last.role !== "assistant") return
-    if (processedTurnRef.current === lastIdx) return
-    processedTurnRef.current = lastIdx
-
-    const calls = last.toolCalls ?? []
-    if (calls.length === 0) {
-      toolIterationsRef.current = 0
-      return
-    }
-    if (toolIterationsRef.current >= MAX_TOOL_ITERATIONS) {
-      console.warn("[admin-tools] tool-iteration cap reached, dropping calls", calls)
-      return
-    }
-
-    toolIterationsRef.current += 1
-    void (async () => {
-      const { reads, writes } = classifyCalls(calls)
-      const { toolMessages: readMsgs } =
-        reads.length > 0
-          ? await runLLMToolCalls(reads, { arcadia })
-          : { toolMessages: [] }
-      if (writes.length > 0) {
-        setPendingConfirm({ afterIndex: lastIdx, writes, readMessages: readMsgs })
-        return
-      }
-      void continueChat(readMsgs, {
-        system: constructorSystemPrompt,
-        tools: getOpenAITools(),
-        maxTokens: responseBudget,
-      })
-    })()
-  }, [messages, isStreaming, arcadia, continueChat, constructorSystemPrompt, responseBudget])
-
-  const onConfirmWrites = useCallback(async () => {
-    if (!pendingConfirm) return
-    setConfirmBusy(true)
-    try {
-      const { toolMessages: writeMsgs } = await runLLMToolCalls(
-        pendingConfirm.writes,
-        { arcadia },
-        { allowWrites: true },
-      )
-      void continueChat([...pendingConfirm.readMessages, ...writeMsgs], {
-        system: constructorSystemPrompt,
-        tools: getOpenAITools(),
-        maxTokens: responseBudget,
-      })
-    } finally {
-      setPendingConfirm(null)
-      setConfirmBusy(false)
-    }
-  }, [pendingConfirm, arcadia, continueChat, constructorSystemPrompt, responseBudget])
-
-  const onDenyWrites = useCallback(() => {
-    if (!pendingConfirm) return
-    const denials = buildDenialMessages(pendingConfirm.writes)
-    void continueChat([...pendingConfirm.readMessages, ...denials], {
-      system: constructorSystemPrompt,
-      tools: getOpenAITools(),
-      maxTokens: responseBudget,
-    })
-    setPendingConfirm(null)
-  }, [pendingConfirm, continueChat, constructorSystemPrompt, responseBudget])
-  const [editingIndex, setEditingIndex] = useState<number | null>(null)
-  const [editingDraft, setEditingDraft] = useState("")
-  const [speakingIndex, setSpeakingIndex] = useState<number | null>(null)
-  const pinnedSet = useMemo(() => new Set(thread.pinned), [thread.pinned])
-
-  const togglePin = useCallback(
-    (i: number) => {
-      const next = pinnedSet.has(i)
-        ? thread.pinned.filter((x) => x !== i)
-        : [...thread.pinned, i].sort((a, b) => a - b)
-      updateThread(thread.id, { pinned: next })
-    },
-    [pinnedSet, thread.id, thread.pinned],
-  )
-
-  const beginEdit = useCallback(
-    (i: number, content: string) => {
-      setEditingIndex(i)
-      setEditingDraft(content)
-    },
-    [],
-  )
-
-  const cancelEdit = useCallback(() => {
-    setEditingIndex(null)
-    setEditingDraft("")
-  }, [])
-
-  const submitEdit = useCallback(() => {
-    if (editingIndex === null) return
-    const text = editingDraft.trim()
-    if (!text) return
-    const truncated = messages.slice(0, editingIndex) as ThreadMessage[]
-    updateThread(thread.id, {
-      messages: truncated,
-      pinned: thread.pinned.filter((idx) => idx < editingIndex),
-    })
-    onRequestRetry(text)
-  }, [editingIndex, editingDraft, messages, thread.id, thread.pinned, onRequestRetry])
-
-  const speak = useCallback(
-    (i: number, text: string) => {
-      if (typeof window === "undefined" || !window.speechSynthesis) return
-      if (speakingIndex === i) {
-        window.speechSynthesis.cancel()
-        setSpeakingIndex(null)
-        return
-      }
-      window.speechSynthesis.cancel()
-      const u = new SpeechSynthesisUtterance(text)
-      u.onend = () => setSpeakingIndex((cur) => (cur === i ? null : cur))
-      u.onerror = () => setSpeakingIndex(null)
-      window.speechSynthesis.speak(u)
-      setSpeakingIndex(i)
-    },
-    [speakingIndex],
-  )
-  const continueLast = useCallback(() => {
-    if (isStreaming) return
-    handleSendRef.current?.("Please continue your previous reply.")
-  }, [isStreaming])
-
-  const [showPromptOpen, setShowPromptOpen] = useState(false)
-  const [hasCompactSnapshot, setHasCompactSnapshot] = useState(
-    () => !!loadThreadSnapshot(thread.id),
-  )
-  useEffect(() => {
-    const id = setInterval(() => {
-      setHasCompactSnapshot(!!loadThreadSnapshot(thread.id))
-    }, 1500)
-    return () => clearInterval(id)
-  }, [thread.id])
-
-  const composedSystemPrompt = useMemo(() => {
-    return buildSystemPrompt({
-      path: typeof window !== "undefined" ? window.location.pathname : "",
-      preface: buildAdminPreface(activeAgent, uiControl),
-      includeActions: uiControl,
-    })
-  }, [uiControl, activeAgent])
-
-  const buildTranscript = useCallback(() => {
-    const lines: string[] = [
-      `# Conversation`,
-      "",
-      activeAgent
-        ? `**Persona:** ${activeAgent.name} — ${activeAgent.role}`
-        : "",
-      `**Date:** ${new Date().toISOString()}`,
-      "",
-    ].filter(Boolean)
-    for (const m of messages) {
-      lines.push(`### ${m.role === "user" ? "User" : "Assistant"}`)
-      lines.push("")
-      lines.push(m.content.trim())
-      lines.push("")
-    }
-    return lines.join("\n")
-  }, [messages, activeAgent])
-
-  const copyMarkdown = useCallback(async () => {
-    try {
-      await navigator.clipboard.writeText(buildTranscript())
-      setActionLog("Copied conversation to clipboard.")
-    } catch (e) {
-      setActionLog(
-        `Copy failed: ${e instanceof Error ? e.message : String(e)}`,
-      )
-    }
-  }, [buildTranscript])
-
-  const saveToLibrary = useCallback(() => {
-    if (messages.length === 0) {
-      setActionLog("Nothing to save.")
-      return
-    }
-    const md = buildTranscript()
-    const item = addLibraryItem({
-      kind: "conversation",
-      title: thread.title,
-      content: md,
-      tags: activeAgent ? [activeAgent.role.toLowerCase()] : [],
-      agentName: activeAgent?.name,
-      agentRole: activeAgent?.role,
-      threadId: thread.id,
-      messageCount: messages.length,
-    })
-    setActionLog(`Saved to Library: "${item.title}".`)
-  }, [messages.length, buildTranscript, thread.title, thread.id, activeAgent])
-
-  const handoffToAgent = useCallback(
-    async (target: Agent) => {
-      if (!activeAgent || target.id === activeAgent.id) return
-      const recent = messages
-        .slice(-6)
-        .map(
-          (m) =>
-            `${m.role === "user" ? "User" : "Assistant"}: ${m.content
-              .trim()
-              .slice(0, 600)}`,
-        )
-        .join("\n\n")
-      const handoffSystem = `You are ${activeAgent.name} (${activeAgent.role}). Write ONE short paragraph (2–4 sentences) handing off this conversation to ${target.name} (${target.role}). Cover: what the user is trying to do, key decisions/constraints, what's still open. Address ${target.name} directly. No greetings, no commentary about the handoff process — just the briefing.`
-      try {
-        const briefing = await completeOneShot(
-          [
-            { role: "system", content: handoffSystem },
-            {
-              role: "user",
-              content: `Recent turns:\n\n${recent}`,
-            },
-          ],
-          { maxTokens: 220 },
-        )
-        const note = `🤝 **Handoff: ${activeAgent.name} → ${target.name}**\n\n${briefing.trim()}`
-        // Stamp the existing thread messages (preserve their authorship) and
-        // attribute the handoff note itself to the OUTGOING agent.
-        const stamped: ThreadMessage[] = messages.map((m, i) => {
-          const prior = thread.messages[i]
-          if (m.role === "user") return { role: "user", content: m.content }
-          return {
-            role: "assistant",
-            content: m.content,
-            agentId: prior?.agentId ?? activeAgent.id,
-          }
-        })
-        const next: ThreadMessage[] = [
-          ...stamped,
-          { role: "assistant", content: note, agentId: activeAgent.id },
-        ]
-        updateThread(thread.id, { messages: next, agentId: target.id })
-        saveActiveAgentId(target.id)
-        setActionLog(`Handed off to ${target.name}.`)
-        onRemount()
-      } catch (e) {
-        setActionLog(
-          `Handoff failed: ${e instanceof Error ? e.message : String(e)}`,
-        )
-      }
-    },
-    [activeAgent, messages, completeOneShot, thread.id, onRemount],
-  )
-
-  const [compareOpen, setCompareOpen] = useState(false)
-
-  const exportMarkdown = useCallback(() => {
-    const md = buildTranscript()
-    const blob = new Blob([md], { type: "text/markdown;charset=utf-8" })
-    const url = URL.createObjectURL(blob)
-    const a = document.createElement("a")
-    a.href = url
-    const stamp = new Date().toISOString().replace(/[:.]/g, "-").slice(0, 19)
-    a.download = `conversation-${stamp}.md`
-    a.click()
-    URL.revokeObjectURL(url)
-    setActionLog("Exported conversation as Markdown.")
-  }, [buildTranscript])
-
-  const scrollerRef = useRef<HTMLDivElement>(null)
-  const lastContent = messages.at(-1)?.content
-  useEffect(() => {
-    const el = scrollerRef.current
-    if (!el) return
-    el.scrollTop = el.scrollHeight
-  }, [messages.length, lastContent, isStreaming])
-
-  // Run action blocks when an assistant turn completes (and UI control is on).
-  const wasStreaming = useRef(false)
-  useEffect(() => {
-    if (wasStreaming.current && !isStreaming) {
-      const last = messages.at(-1)
-      if (uiControl && last?.role === "assistant" && last.content) {
-        void runActionBlocks(last.content).then((res) => {
-          if (res.ran > 0) {
-            setActionLog(`Ran ${res.ran} action block${res.ran > 1 ? "s" : ""}.`)
-          } else if (res.errors.length > 0) {
-            setActionLog(`Action error: ${res.errors[0]}`)
-          }
-          // Safety net: always return to the Assistant page once a UI Control
-          // sequence finishes, even if the model forgot the trailing nav step.
-          if (
-            res.ran > 0 &&
-            typeof window !== "undefined" &&
-            window.location.pathname !== "/assistant"
-          ) {
-            setTimeout(() => {
-              const navAssistant = document.querySelector<HTMLElement>(
-                '[data-action="nav-assistant"]',
-              )
-              if (navAssistant) navAssistant.click()
-            }, 600)
-          }
-        })
-      }
-    }
-    wasStreaming.current = isStreaming
-  }, [isStreaming, messages, uiControl])
-
-  const handleSend: (text: string) => void = (text: string) => {
-    const system = buildSystemPrompt({
-      path: window.location.pathname,
-      preface: buildAdminPreface(activeAgent, uiControl),
-      includeActions: uiControl,
-    })
-    void send(text, {
-      system,
-      tools: getOpenAITools(),
-      maxTokens: responseBudget,
-    })
-  }
-  handleSendRef.current = handleSend
-
-  // Consume a pending action queued by the parent across remounts (Retry).
-  useEffect(() => {
-    if (!pendingAction) return
-    if (pendingAction.kind === "retry") {
-      handleSend(pendingAction.text)
-    }
-    onPendingActionConsumed()
-    // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [])
-
-  const usedTokens = useMemo(() => {
-    const system = buildSystemPrompt({
-      path: typeof window !== "undefined" ? window.location.pathname : "",
-      preface: buildAdminPreface(activeAgent, uiControl),
-      includeActions: uiControl,
-    })
-    const sysT = estimateTokens(system)
-    const histT = messages.reduce((n, m) => n + estimateTokens(m.content), 0)
-    return sysT + histT
-  }, [messages, uiControl, systemPrompt, activeAgent])
-
-  const suggestions = uiControl
-    ? [
-        "Take me to the resources page",
-        "Type \"hello\" in the appbar search",
-        "Click the notifications button",
-        "Open the account menu",
-        "Show me what's on the screen",
-      ]
-    : [
-        "What can this app do?",
-        "Draft a release note",
-        "Summarize this week's activity",
-        "Show me a SQL example",
-      ]
-
-  return (
-    <div className="flex h-[calc(100svh-3.5rem-3rem)] flex-col gap-4">
-      {uiControl && showUiControlBanner && (
-        <div className="flex items-start gap-2 rounded-lg border border-primary/30 bg-primary/5 px-3 py-2 text-xs text-foreground/80">
-          <span className="flex-1">
-            UI control is on. The assistant can navigate, click, and fill on
-            your behalf. Watch the cursor.
-          </span>
-          <button
-            type="button"
-            onClick={() => setShowUiControlBanner(false)}
-            aria-label="Dismiss"
-            className="-my-1 rounded p-1 text-muted-foreground hover:bg-accent hover:text-accent-foreground"
-          >
-            ✕
-          </button>
-        </div>
-      )}
-
-      <div
-        ref={scrollerRef}
-        className="flex-1 overflow-y-auto rounded-lg border bg-card/30 p-4"
-      >
-        {messages.length === 0 ? (
-          <EmptyState uiControl={uiControl} />
-        ) : (
-          <div className="flex flex-col gap-3">
-            {messages.map((m, i) => {
-              const isPinned = pinnedSet.has(i)
-              const isLastUser =
-                m.role === "user" &&
-                !messages.slice(i + 1).some((x) => x.role === "user")
-              const isEditing = editingIndex === i
-              const isUser = m.role === "user"
-              const msgAgentId =
-                !isUser
-                  ? thread.messages[i]?.agentId ?? activeAgent?.id
-                  : undefined
-              const msgAgent = msgAgentId
-                ? agents.find((a) => a.id === msgAgentId) ?? activeAgent
-                : undefined
-              return (
-                <div
-                  key={i}
-                  className={
-                    "group flex w-full items-start gap-2 " +
-                    (isUser ? "flex-row-reverse" : "flex-row")
-                  }
-                >
-                  {!isUser && msgAgent && (
-                    <Avatar
-                      className="mt-5 size-7 shrink-0 ring-1 ring-border"
-                      title={`${msgAgent.name} — ${msgAgent.role}`}
-                    >
-                      <AvatarFallback
-                        style={{
-                          background: agentTint(msgAgent.id),
-                          color: "var(--primary-foreground)",
-                        }}
-                        className="text-[11px] font-semibold"
-                      >
-                        {agentInitials(msgAgent.name)}
-                      </AvatarFallback>
-                    </Avatar>
-                  )}
-                  <div
-                    className={
-                      "flex max-w-[80%] flex-col " +
-                      (isUser ? "items-end" : "items-start")
-                    }
-                  >
-                    <div className="mb-0.5 flex items-center gap-1.5 px-1">
-                      <span className="text-xs font-medium text-muted-foreground">
-                        {isUser
-                          ? "You"
-                          : (msgAgent?.name ?? "Assistant")}
-                      </span>
-                      {!isUser && msgAgent && (
-                        <span className="text-[10px] text-muted-foreground/70">
-                          · {msgAgent.role}
-                        </span>
-                      )}
-                      {isPinned && (
-                        <Pin className="size-3 fill-primary text-primary" />
-                      )}
-                    </div>
-                    {isEditing ? (
-                      <div className="w-full rounded-2xl border border-primary/40 bg-background p-2">
-                        <textarea
-                          value={editingDraft}
-                          onChange={(e) => setEditingDraft(e.target.value)}
-                          autoFocus
-                          rows={3}
-                          className="w-full resize-none rounded-md bg-transparent px-2 py-1.5 text-sm leading-relaxed outline-none"
-                          onKeyDown={(e) => {
-                            if (e.key === "Enter" && (e.metaKey || e.ctrlKey)) {
-                              e.preventDefault()
-                              submitEdit()
-                            } else if (e.key === "Escape") {
-                              e.preventDefault()
-                              cancelEdit()
-                            }
-                          }}
-                        />
-                        <div className="flex items-center justify-end gap-1 px-1">
-                          <Button
-                            size="sm"
-                            variant="ghost"
-                            onClick={cancelEdit}
-                          >
-                            Cancel
-                          </Button>
-                          <Button size="sm" onClick={submitEdit}>
-                            Save & retry
-                          </Button>
-                        </div>
-                      </div>
-                    ) : (
-                      <div
-                        className={
-                          m.role === "tool"
-                            ? "text-sm leading-relaxed"
-                            : isUser
-                              ? "rounded-2xl rounded-br-md bg-primary px-3.5 py-2 text-sm leading-relaxed text-primary-foreground"
-                              : "rounded-2xl rounded-bl-md bg-muted px-3.5 py-2 text-sm leading-relaxed text-foreground"
-                        }
-                      >
-                        {m.role === "tool" ? (
-                          <MessageBody content={m.content} isToolResult />
-                        ) : m.content || (m.role === "assistant" && m.toolCalls?.length) ? (
-                          isUser ? (
-                            <span className="whitespace-pre-wrap">
-                              {m.content}
-                            </span>
-                          ) : (
-                            <MessageBody content={m.content} toolCalls={m.toolCalls} />
-                          )
-                        ) : isStreaming && i === messages.length - 1 ? (
-                          "…"
-                        ) : null}
-                      </div>
-                    )}
-                    {!isEditing && (
-                      <div className="mt-0.5 flex items-center gap-0.5 px-1 opacity-0 transition-opacity group-hover:opacity-100">
-                        <button
-                          type="button"
-                          data-action={`assistant-msg-pin-${i}`}
-                          onClick={() => togglePin(i)}
-                          aria-label={isPinned ? "Unpin" : "Pin"}
-                          title={
-                            isPinned
-                              ? "Unpin (Compact will not preserve)"
-                              : "Pin (Compact preserves verbatim)"
-                          }
-                          className={
-                            "rounded p-1 hover:bg-accent " +
-                            (isPinned
-                              ? "text-primary"
-                              : "text-muted-foreground")
-                          }
-                        >
-                          <Pin
-                            className={
-                              "size-3.5 " + (isPinned ? "fill-current" : "")
-                            }
-                          />
-                        </button>
-                        {!isUser && (
-                          <button
-                            type="button"
-                            data-action={`assistant-msg-speak-${i}`}
-                            onClick={() => speak(i, m.content)}
-                            disabled={!m.content}
-                            aria-label={
-                              speakingIndex === i ? "Stop reading" : "Read aloud"
-                            }
-                            title={
-                              speakingIndex === i ? "Stop reading" : "Read aloud"
-                            }
-                            className="rounded p-1 text-muted-foreground hover:bg-accent disabled:opacity-30"
-                          >
-                            {speakingIndex === i ? (
-                              <VolumeX className="size-3.5" />
-                            ) : (
-                              <Volume2 className="size-3.5" />
-                            )}
-                          </button>
-                        )}
-                        {isUser && isLastUser && (
-                          <button
-                            type="button"
-                            data-action={`assistant-msg-edit-${i}`}
-                            onClick={() => beginEdit(i, m.content)}
-                            disabled={isStreaming}
-                            aria-label="Edit message"
-                            title="Edit & retry"
-                            className="rounded p-1 text-muted-foreground hover:bg-accent disabled:opacity-30"
-                          >
-                            <Pencil className="size-3.5" />
-                          </button>
-                        )}
-                      </div>
-                    )}
-                  </div>
-                  {pendingConfirm?.afterIndex === i && (
-                    <ConfirmCard
-                      calls={pendingConfirm.writes}
-                      onConfirm={onConfirmWrites}
-                      onDeny={onDenyWrites}
-                      busy={confirmBusy}
-                    />
-                  )}
-                </div>
-              )
-            })}
-            {isStreaming && messages.at(-1)?.role !== "assistant" && (
-              <TypingIndicator />
-            )}
-          </div>
-        )}
-      </div>
-
-      {actionLog && (
-        <div className="rounded-lg border bg-card/40 px-3 py-2 text-xs text-muted-foreground">
-          {actionLog}
-        </div>
-      )}
-
-      {error && (
-        <div className="rounded-lg border border-destructive/50 bg-destructive/10 px-3 py-2 text-sm text-destructive">
-          {error.message}
-        </div>
-      )}
-
-      <div className="relative">
-        <CommandBar
-          chips={suggestions}
-          position="bottom"
-          placeholder={
-            uiControl ? "Ask me to do something…" : "Ask the assistant…"
-          }
-          onSubmit={handleSend}
-          onChipSelect={handleSend}
-        />
-        <VoiceInputButton onTranscript={(t) => handleSend(t)} />
-      </div>
-
-      <div className="flex flex-wrap items-center gap-2 rounded-lg border bg-card/50 px-3 py-2">
-        <StatusDot status={status} />
-        {status.kind === "probing" && (
-          <span className="text-xs text-muted-foreground">Probing…</span>
-        )}
-        {status.kind === "live" && (
-          <>
-            <KindChip kind={endpointKind(baseURL)} />
-            <HostChip baseURL={baseURL} />
-          </>
-        )}
-        {status.kind === "mock" && (
-          <span title={status.reason}>
-            <KindChip kind="mock" />
-          </span>
-        )}
-        <ContextGauge
-          used={usedTokens}
-          total={contextTokens}
-          warnAt={contextTokens - responseBudget}
-        />
-        <ThreadsPicker
-          thread={thread}
-          threads={threads}
-          onSwitch={onSwitchThread}
-          onNew={onNewThread}
-          onDelete={onDeleteThread}
-          onRename={onRenameThread}
-        />
-        <DropdownMenu>
-          <DropdownMenuTrigger
-            data-action="assistant-agent"
-            className="inline-flex items-center gap-2 rounded-md py-1 pl-1 pr-2 text-left transition-colors hover:bg-accent hover:text-accent-foreground focus:outline-none focus-visible:ring-2 focus-visible:ring-ring"
-            title={
-              activeAgent
-                ? `${activeAgent.name} — ${activeAgent.role}`
-                : "Pick a persona"
-            }
-          >
-            <Avatar className="size-8 ring-2 ring-primary/30">
-              <AvatarFallback
-                style={{
-                  background: agentTint(activeAgent?.id ?? ""),
-                  color: "var(--primary-foreground)",
-                }}
-                className="text-xs font-semibold"
-              >
-                {agentInitials(activeAgent?.name)}
-              </AvatarFallback>
-            </Avatar>
-            <span className="flex flex-col leading-tight">
-              <span className="text-sm font-medium">
-                {activeAgent?.name ?? "Agent"}
-              </span>
-              <span className="text-[10px] text-muted-foreground">
-                {activeAgent?.role}
-              </span>
-            </span>
-            <ChevronDown className="size-3.5 opacity-60" />
-          </DropdownMenuTrigger>
-          <DropdownMenuContent
-            align="start"
-            side="top"
-            sideOffset={6}
-            className="max-h-80 w-72 overflow-y-auto"
-          >
-            <div className="px-2 py-1 text-[10px] font-medium uppercase tracking-wide text-muted-foreground">
-              Switch persona
-            </div>
-            {agents.map((a) => (
-              <DropdownMenuItem
-                key={a.id}
-                onClick={() => setActiveAgentId(a.id)}
-                data-state={activeAgentId === a.id ? "checked" : undefined}
-                className="flex items-center gap-2.5"
-              >
-                <Avatar className="size-7">
-                  <AvatarFallback
-                    style={{
-                      background: agentTint(a.id),
-                      color: "var(--primary-foreground)",
-                    }}
-                    className="text-[11px] font-semibold"
-                  >
-                    {agentInitials(a.name)}
-                  </AvatarFallback>
-                </Avatar>
-                <span className="flex min-w-0 flex-col">
-                  <span className="truncate font-medium">{a.name}</span>
-                  <span className="truncate text-xs text-muted-foreground">
-                    {a.role}
-                  </span>
-                </span>
-              </DropdownMenuItem>
-            ))}
-            {agents.filter((a) => a.id !== activeAgentId).length > 0 &&
-              messages.length > 0 && (
-                <>
-                  <div className="my-1 h-px bg-border" />
-                  <div className="px-2 py-1 text-[10px] font-medium uppercase tracking-wide text-muted-foreground">
-                    Hand off (with briefing)
-                  </div>
-                  {agents
-                    .filter((a) => a.id !== activeAgentId)
-                    .map((a) => (
-                      <DropdownMenuItem
-                        key={`handoff-${a.id}`}
-                        data-action={`assistant-handoff-${a.id}`}
-                        onClick={() => void handoffToAgent(a)}
-                        className="flex items-center gap-2.5"
-                      >
-                        <span className="inline-flex size-7 items-center justify-center rounded-full bg-muted text-muted-foreground">
-                          <ArrowRight className="size-3.5" />
-                        </span>
-                        <span className="flex min-w-0 flex-col">
-                          <span className="truncate text-sm font-medium">
-                            Hand off to {a.name}
-                          </span>
-                          <span className="truncate text-xs text-muted-foreground">
-                            {a.role}
-                          </span>
-                        </span>
-                      </DropdownMenuItem>
-                    ))}
-                </>
-              )}
-          </DropdownMenuContent>
-        </DropdownMenu>
-        <div className="ml-auto flex items-center gap-2">
-          {status.kind === "live" ? (
-            <DropdownMenu>
-              <DropdownMenuTrigger
-                data-action="assistant-model"
-                className="inline-flex h-8 items-center gap-1.5 rounded-md border bg-background px-2 text-sm hover:bg-accent hover:text-accent-foreground focus:outline-none focus-visible:ring-2 focus-visible:ring-ring"
-              >
-                <span className="max-w-[18ch] truncate">
-                  {model || status.models[0]}
-                </span>
-                <ChevronDown className="size-3.5 opacity-60" />
-              </DropdownMenuTrigger>
-              <DropdownMenuContent
-                align="end"
-                side="top"
-                sideOffset={6}
-                className="max-h-64 overflow-y-auto"
-              >
-                {status.models.map((m) => (
-                  <DropdownMenuItem
-                    key={m}
-                    onClick={() => onModelChange(m)}
-                    data-state={
-                      (model || status.models[0]) === m ? "checked" : undefined
-                    }
-                  >
-                    {m}
-                  </DropdownMenuItem>
-                ))}
-              </DropdownMenuContent>
-            </DropdownMenu>
-          ) : (
-            <span className="rounded-md border bg-muted px-2 py-1 text-xs">
-              mock
-            </span>
-          )}
-          {uiControl && (
-            <span
-              className="hidden rounded-full border border-primary/40 bg-primary/10 px-2 py-0.5 text-[10px] font-medium uppercase tracking-wide text-primary md:inline"
-              title="UI Control is on"
-            >
-              UI · ON
-            </span>
-          )}
-          {isStreaming && (
-            <Button
-              data-action="assistant-stop"
-              variant="outline"
-              size="sm"
-              onClick={abort}
-            >
-              <Square className="size-3 fill-current" /> Stop
-            </Button>
-          )}
-          <Popover>
-            <PopoverTrigger
-              render={
-                <Button
-                  data-action="assistant-actions"
-                  variant="ghost"
-                  size="icon-sm"
-                  aria-label="Conversation actions"
-                  title="Actions"
-                >
-                  <MoreHorizontal />
-                </Button>
-              }
-            />
-            <PopoverContent align="end" side="top" className="w-80 p-2">
-              {/* UI Control toggle — full width */}
-              <button
-                type="button"
-                data-action="assistant-ui-control"
-                onClick={() => setUiControl((v) => !v)}
-                className="mb-2 flex w-full items-center gap-2 rounded-md border bg-card/40 px-2.5 py-2 text-left text-sm hover:bg-accent hover:text-accent-foreground"
-                title={
-                  uiControl
-                    ? "UI Control on — assistant can drive the UI"
-                    : "UI Control off — chat-only"
-                }
-              >
-                <Wand2 className="size-4" />
-                <span className="flex flex-1 flex-col leading-tight">
-                  <span className="font-medium">UI Control</span>
-                  <span className="text-[11px] text-muted-foreground">
-                    {uiControl ? "On" : "Off"}
-                  </span>
-                </span>
-                <span
-                  className={
-                    "size-2 rounded-full " +
-                    (uiControl ? "bg-primary" : "bg-muted-foreground/40")
-                  }
-                  aria-hidden
-                />
-              </button>
-
-              <SectionLabel>Conversation</SectionLabel>
-              <div className="grid grid-cols-2 gap-1">
-                <ToolTile
-                  data-action="assistant-regenerate"
-                  onClick={regenerateLast}
-                  disabled={
-                    isStreaming ||
-                    !messages.some((m) => m.role === "user")
-                  }
-                  icon={<RotateCcw className="size-4" />}
-                  label="Regenerate"
-                  title="Re-run the most recent prompt"
-                />
-                <ToolTile
-                  data-action="assistant-continue"
-                  onClick={continueLast}
-                  disabled={isStreaming || messages.length === 0}
-                  icon={<ArrowRight className="size-4" />}
-                  label="Continue"
-                  title="Ask the model to keep going"
-                />
-                <ToolTile
-                  data-action="assistant-compact"
-                  onClick={() => void compactConversation()}
-                  disabled={compacting || isStreaming || messages.length < 2}
-                  icon={
-                    compacting ? (
-                      <Loader2 className="size-4 animate-spin" />
-                    ) : (
-                      <Archive className="size-4" />
-                    )
-                  }
-                  label="Compact"
-                  title="Summarize older turns to free context"
-                />
-                <ToolTile
-                  data-action="assistant-restore-compact"
-                  onClick={restoreCompact}
-                  disabled={!hasCompactSnapshot}
-                  icon={<Undo2 className="size-4" />}
-                  label="Restore"
-                  title={
-                    hasCompactSnapshot
-                      ? "Undo the most recent compact"
-                      : "No snapshot available"
-                  }
-                />
-              </div>
-
-              <SectionLabel>Share</SectionLabel>
-              <div className="grid grid-cols-2 gap-1">
-                <ToolTile
-                  data-action="assistant-copy-md"
-                  onClick={() => void copyMarkdown()}
-                  disabled={messages.length === 0}
-                  icon={<Copy className="size-4" />}
-                  label="Copy MD"
-                  title="Copy conversation as Markdown"
-                />
-                <ToolTile
-                  data-action="assistant-export-md"
-                  onClick={exportMarkdown}
-                  disabled={messages.length === 0}
-                  icon={<Download className="size-4" />}
-                  label="Export MD"
-                  title="Download a .md file"
-                />
-                <ToolTile
-                  data-action="assistant-save-library"
-                  onClick={saveToLibrary}
-                  disabled={messages.length === 0}
-                  icon={<BookmarkPlus className="size-4" />}
-                  label="Save to Library"
-                  title="Snapshot this conversation"
-                />
-                <ToolTile
-                  data-action="assistant-show-prompt"
-                  onClick={() => setShowPromptOpen(true)}
-                  icon={<FileText className="size-4" />}
-                  label="Show prompt"
-                  title="Preview the system prompt"
-                />
-              </div>
-
-              <SectionLabel>Multi-agent</SectionLabel>
-              <div className="grid grid-cols-2 gap-1">
-                <ToolTile
-                  data-action="assistant-compare"
-                  onClick={() => setCompareOpen(true)}
-                  disabled={
-                    agents.length < 2 ||
-                    !messages.some((m) => m.role === "user")
-                  }
-                  icon={<Users className="size-4" />}
-                  label="Compare"
-                  title="Run the last prompt through several personas"
-                />
-                {status.kind === "mock" && (
-                  <ToolTile
-                    data-action="assistant-retry-probe"
-                    onClick={onRetryProbe}
-                    icon={<RefreshCw className="size-4" />}
-                    label="Reconnect"
-                    title="Probe the LLM endpoint again"
-                  />
-                )}
-              </div>
-
-              <div className="my-2 h-px bg-border" />
-              <ToolTile
-                data-action="assistant-clear"
-                onClick={clearConversation}
-                disabled={messages.length === 0}
-                icon={<Trash2 className="size-4" />}
-                label="Clear conversation"
-                title="Wipe history and start fresh"
-                destructive
-                fullWidth
-              />
-            </PopoverContent>
-          </Popover>
-        </div>
-      </div>
-
-      {showPromptOpen && (
-        <SystemPromptDialog
-          prompt={composedSystemPrompt}
-          uiControl={uiControl}
-          onClose={() => setShowPromptOpen(false)}
-        />
-      )}
-
-      {compareOpen && (
-        <CompareDialog
-          agents={agents}
-          basePrompt={basePrompt}
-          messages={messages as ThreadMessage[]}
-          responseBudget={responseBudget}
-          onClose={() => setCompareOpen(false)}
-          onAppend={(agentName, content) => {
-            const speaker = agents.find((a) => a.name === agentName)
-            const note = `🪞 **${agentName} says:**\n\n${content}`
-            const stamped: ThreadMessage[] = messages.map((m, i) => {
-              const prior = thread.messages[i]
-              if (m.role === "user") return { role: "user", content: m.content }
-              return {
-                role: "assistant",
-                content: m.content,
-                agentId: prior?.agentId ?? activeAgent?.id,
-              }
-            })
-            const next: ThreadMessage[] = [
-              ...stamped,
-              {
-                role: "assistant",
-                content: note,
-                agentId: speaker?.id ?? activeAgent?.id,
-              },
-            ]
-            updateThread(thread.id, { messages: next })
-            setActionLog(`Appended ${agentName}'s reply to the thread.`)
-            setCompareOpen(false)
-            onRemount()
-          }}
-        />
-      )}
-    </div>
-  )
-}
-
-function CompareDialog({
-  agents,
-  basePrompt,
-  messages,
-  responseBudget,
-  onClose,
-  onAppend,
-}: {
-  agents: Agent[]
-  basePrompt: string
-  messages: ThreadMessage[]
-  responseBudget: number
-  onClose: () => void
-  onAppend: (agentName: string, content: string) => void
-}) {
-  const lastUser = [...messages].reverse().find((m) => m.role === "user")
-  const [selected, setSelected] = useState<Set<string>>(
-    () => new Set(agents.map((a) => a.id)),
-  )
-  const [prompt, setPrompt] = useState(lastUser?.content ?? "")
-  const [results, setResults] = useState<
-    Record<string, { state: "pending" | "ok" | "fail"; content: string }>
-  >({})
-  const [running, setRunning] = useState(false)
-  const { complete } = useCompletion()
-
-  const toggle = (id: string) => {
-    const next = new Set(selected)
-    if (next.has(id)) next.delete(id)
-    else next.add(id)
-    setSelected(next)
-  }
-
-  const run = async () => {
-    if (!prompt.trim() || selected.size === 0) return
-    setRunning(true)
-    const initial: typeof results = {}
-    for (const id of selected) {
-      initial[id] = { state: "pending", content: "" }
-    }
-    setResults(initial)
-    await Promise.all(
-      Array.from(selected).map(async (id) => {
-        const a = agents.find((x) => x.id === id)
-        if (!a) return
-        const sys = `${basePrompt}\n\nActive persona: ${a.name} — ${a.role}\n${a.prompt}`
-        try {
-          const out = await complete(
-            [
-              { role: "system", content: sys },
-              { role: "user", content: prompt },
-            ],
-            { maxTokens: responseBudget },
-          )
-          setResults((cur) => ({
-            ...cur,
-            [id]: { state: "ok", content: out },
-          }))
-        } catch (e) {
-          setResults((cur) => ({
-            ...cur,
-            [id]: {
-              state: "fail",
-              content: e instanceof Error ? e.message : String(e),
-            },
-          }))
-        }
-      }),
-    )
-    setRunning(false)
-  }
-
-  return (
-    <div
-      role="dialog"
-      aria-modal="true"
-      onClick={onClose}
-      className="fixed inset-0 z-50 flex items-center justify-center bg-background/70 p-4 backdrop-blur-sm"
-    >
-      <div
-        onClick={(e) => e.stopPropagation()}
-        className="flex max-h-[88vh] w-full max-w-5xl flex-col rounded-lg border bg-card shadow-lg"
-      >
-        <div className="flex items-center gap-2 border-b px-4 py-3">
-          <Users className="size-4 text-muted-foreground" />
-          <div className="flex flex-1 flex-col">
-            <span className="text-sm font-semibold">Compare across agents</span>
-            <span className="text-xs text-muted-foreground">
-              Run the same prompt through several personas in parallel.
-            </span>
-          </div>
-          <Button variant="ghost" size="icon-sm" onClick={onClose} aria-label="Close">
-            <Square className="size-3" />
-          </Button>
-        </div>
-
-        <div className="flex flex-col gap-3 border-b px-4 py-3">
-          <textarea
-            value={prompt}
-            onChange={(e) => setPrompt(e.target.value)}
-            rows={3}
-            className="w-full resize-none rounded-md border border-input bg-background px-3 py-2 text-sm outline-none focus:ring-2 focus:ring-ring/40"
-            placeholder="Prompt to send to each selected agent…"
-          />
-          <div className="flex flex-wrap items-center gap-2">
-            {agents.map((a) => {
-              const on = selected.has(a.id)
-              return (
-                <button
-                  key={a.id}
-                  type="button"
-                  onClick={() => toggle(a.id)}
-                  className={
-                    "inline-flex items-center gap-1.5 rounded-full border px-2.5 py-1 text-xs " +
-                    (on
-                      ? "border-primary/40 bg-primary/10 text-primary"
-                      : "border-border text-muted-foreground hover:bg-accent hover:text-foreground")
-                  }
-                >
-                  <span
-                    className="inline-block size-2 rounded-full"
-                    style={{ background: agentTint(a.id) }}
-                    aria-hidden
-                  />
-                  <span>{a.name}</span>
-                  <span className="opacity-60">· {a.role}</span>
-                </button>
-              )
-            })}
-            <div className="ml-auto flex items-center gap-2">
-              <span className="text-xs text-muted-foreground">
-                {selected.size} selected
-              </span>
-              <Button
-                onClick={() => void run()}
-                disabled={running || selected.size === 0 || !prompt.trim()}
-                size="sm"
-              >
-                {running ? (
-                  <Loader2 className="size-3.5 animate-spin" />
-                ) : (
-                  <ArrowRight className="size-3.5" />
-                )}
-                Run
-              </Button>
-            </div>
-          </div>
-        </div>
-
-        <div className="grid flex-1 grid-cols-1 gap-3 overflow-auto p-4 md:grid-cols-2 lg:grid-cols-3">
-          {Array.from(selected).map((id) => {
-            const a = agents.find((x) => x.id === id)
-            if (!a) return null
-            const r = results[id]
-            return (
-              <div
-                key={id}
-                className="flex flex-col rounded-lg border bg-background"
-              >
-                <div className="flex items-center gap-2 border-b px-3 py-2">
-                  <span
-                    className="size-2 rounded-full"
-                    style={{ background: agentTint(a.id) }}
-                    aria-hidden
-                  />
-                  <div className="flex flex-1 flex-col leading-tight">
-                    <span className="text-sm font-medium">{a.name}</span>
-                    <span className="text-[11px] text-muted-foreground">
-                      {a.role}
-                    </span>
-                  </div>
-                  {r?.state === "ok" && (
-                    <Button
-                      size="sm"
-                      variant="ghost"
-                      onClick={() => onAppend(a.name, r.content)}
-                      title="Append to thread"
-                    >
-                      <ArrowRight className="size-3.5" /> Use
-                    </Button>
-                  )}
-                </div>
-                <div className="max-h-72 min-h-32 overflow-auto p-3 text-xs leading-relaxed">
-                  {!r ? (
-                    <span className="text-muted-foreground">
-                      Click Run to generate.
-                    </span>
-                  ) : r.state === "pending" ? (
-                    <span className="inline-flex items-center gap-1 text-muted-foreground">
-                      <Loader2 className="size-3 animate-spin" /> Thinking…
-                    </span>
-                  ) : r.state === "fail" ? (
-                    <span className="text-destructive">Error: {r.content}</span>
-                  ) : (
-                    <pre className="whitespace-pre-wrap font-sans">
-                      {r.content}
-                    </pre>
-                  )}
-                </div>
-              </div>
-            )
-          })}
-        </div>
-      </div>
-    </div>
-  )
-}
-
-function SystemPromptDialog({
-  prompt,
-  uiControl,
-  onClose,
-}: {
-  prompt: string
-  uiControl: boolean
-  onClose: () => void
-}) {
-  const copy = async () => {
-    try {
-      await navigator.clipboard.writeText(prompt)
-    } catch {
-      /* ignore */
-    }
-  }
-  return (
-    <div
-      role="dialog"
-      aria-modal="true"
-      onClick={onClose}
-      className="fixed inset-0 z-50 flex items-center justify-center bg-background/70 p-4 backdrop-blur-sm"
-    >
-      <div
-        onClick={(e) => e.stopPropagation()}
-        className="flex max-h-[80vh] w-full max-w-2xl flex-col rounded-lg border bg-card shadow-lg"
-      >
-        <div className="flex items-center gap-2 border-b px-4 py-3">
-          <FileText className="size-4 text-muted-foreground" />
-          <div className="flex flex-1 flex-col">
-            <span className="text-sm font-semibold">System prompt</span>
-            <span className="text-xs text-muted-foreground">
-              {uiControl
-                ? "UI Control on — includes action DSL + persona + live actions"
-                : "Base prompt + active persona"}
-            </span>
-          </div>
-          <Button variant="ghost" size="sm" onClick={copy}>
-            <Copy className="size-3.5" /> Copy
-          </Button>
-          <Button variant="ghost" size="icon-sm" onClick={onClose} aria-label="Close">
-            <Square className="size-3" />
-          </Button>
-        </div>
-        <pre className="flex-1 overflow-auto whitespace-pre-wrap p-4 font-mono text-xs leading-relaxed">
-          {prompt}
-        </pre>
-      </div>
-    </div>
-  )
-}
-
-function ContextGauge({
-  used,
-  total,
-  warnAt,
-}: {
-  used: number
-  total: number
-  warnAt: number
-}) {
-  const pct = total > 0 ? Math.min(1, used / total) : 0
-  const warn = used > warnAt
-  const fmt = (n: number) =>
-    n >= 1000 ? `${(n / 1000).toFixed(n >= 10000 ? 0 : 1)}k` : `${n}`
-  return (
-    <span
-      className="inline-flex min-w-0 items-center gap-2 text-xs tabular-nums text-muted-foreground"
-      title={`${used} / ${total} tokens used (${Math.round(pct * 100)}%). Response capped at ${total - warnAt}.`}
-    >
-      <span
-        role="progressbar"
-        aria-valuemin={0}
-        aria-valuemax={total}
-        aria-valuenow={used}
-        aria-label="Context tokens used"
-        className="relative h-1.5 w-32 overflow-hidden rounded-full bg-muted"
-      >
-        <span
-          className={`absolute inset-y-0 left-0 rounded-full transition-[width] duration-200 ease-out ${
-            warn ? "bg-amber-500" : "bg-primary"
-          }`}
-          style={{ width: `${pct * 100}%` }}
-        />
-      </span>
-      <span className={warn ? "text-amber-600 dark:text-amber-300" : ""}>
-        {fmt(used)}/{fmt(total)}
-      </span>
-    </span>
-  )
-}
-
-function SectionLabel({ children }: { children: React.ReactNode }) {
-  return (
-    <div className="mt-2 mb-1 px-1 text-[10px] font-medium uppercase tracking-wide text-muted-foreground">
-      {children}
-    </div>
-  )
-}
-
-function ToolTile({
-  icon,
-  label,
-  title,
-  onClick,
-  disabled,
-  destructive,
-  fullWidth,
-  ...rest
-}: {
-  icon: React.ReactNode
-  label: string
-  title: string
-  onClick: () => void
-  disabled?: boolean
-  destructive?: boolean
-  fullWidth?: boolean
-} & Omit<React.ButtonHTMLAttributes<HTMLButtonElement>, "onClick" | "title">) {
-  return (
-    <button
-      type="button"
-      onClick={onClick}
-      disabled={disabled}
-      title={title}
-      className={
-        "flex items-center gap-2 rounded-md border border-transparent px-2 py-1.5 text-left text-xs transition-colors disabled:cursor-not-allowed disabled:opacity-50 " +
-        (fullWidth ? "w-full " : "") +
-        (destructive
-          ? "text-destructive hover:bg-destructive/10"
-          : "hover:bg-accent hover:text-accent-foreground")
-      }
-      {...rest}
-    >
-      <span className="shrink-0">{icon}</span>
-      <span className="truncate font-medium">{label}</span>
-    </button>
-  )
-}
-
-type SpeechRecognitionLike = {
-  start: () => void
-  stop: () => void
-  abort: () => void
-  onresult: ((e: { results: { 0: { transcript: string } }[] }) => void) | null
-  onerror: ((e: unknown) => void) | null
-  onend: (() => void) | null
-  lang: string
-  interimResults: boolean
-  continuous: boolean
-}
-
-function getSpeechRecognition(): (new () => SpeechRecognitionLike) | null {
-  if (typeof window === "undefined") return null
-  const w = window as unknown as {
-    SpeechRecognition?: new () => SpeechRecognitionLike
-    webkitSpeechRecognition?: new () => SpeechRecognitionLike
-  }
-  return w.SpeechRecognition ?? w.webkitSpeechRecognition ?? null
-}
-
-function VoiceInputButton({
-  onTranscript,
-}: {
-  onTranscript: (text: string) => void
-}) {
-  const Ctor = getSpeechRecognition()
-  const [listening, setListening] = useState(false)
-  const recRef = useRef<SpeechRecognitionLike | null>(null)
-
-  if (!Ctor) return null
-
-  const start = () => {
-    try {
-      const rec = new Ctor()
-      rec.lang = navigator.language || "en-US"
-      rec.interimResults = false
-      rec.continuous = false
-      rec.onresult = (e) => {
-        const text = e.results[0]?.[0]?.transcript ?? ""
-        if (text.trim()) onTranscript(text.trim())
-      }
-      rec.onerror = () => setListening(false)
-      rec.onend = () => setListening(false)
-      recRef.current = rec
-      rec.start()
-      setListening(true)
-    } catch {
-      setListening(false)
-    }
-  }
-  const stop = () => {
-    recRef.current?.stop()
-    setListening(false)
-  }
-
-  return (
-    <button
-      type="button"
-      data-action="assistant-voice"
-      onClick={() => (listening ? stop() : start())}
-      aria-label={listening ? "Stop listening" : "Voice input"}
-      title={listening ? "Stop listening" : "Voice input"}
-      className={
-        "absolute right-4 top-1/2 z-30 inline-flex size-8 -translate-y-1/2 items-center justify-center rounded-full border bg-background shadow-sm transition-colors " +
-        (listening
-          ? "border-destructive/50 bg-destructive/10 text-destructive animate-pulse"
-          : "text-muted-foreground hover:bg-accent hover:text-foreground")
-      }
-    >
-      {listening ? <MicOff className="size-4" /> : <Mic className="size-4" />}
-    </button>
-  )
-}
-
-function ThreadsPicker({
-  thread,
-  threads,
-  onSwitch,
-  onNew,
-  onDelete,
-  onRename,
-}: {
-  thread: Thread
-  threads: Thread[]
-  onSwitch: (id: string) => void
-  onNew: () => void
-  onDelete: (id: string) => void
-  onRename: (id: string, title: string) => void
-}) {
-  const sorted = [...threads].sort((a, b) => b.updatedAt - a.updatedAt)
-  return (
-    <DropdownMenu>
-      <DropdownMenuTrigger
-        data-action="assistant-thread"
-        className="inline-flex h-8 items-center gap-1.5 rounded-md border bg-background px-2 text-sm hover:bg-accent hover:text-accent-foreground focus:outline-none focus-visible:ring-2 focus-visible:ring-ring"
-        title="Conversations"
-      >
-        <MessagesSquare className="size-3.5 opacity-70" />
-        <span className="max-w-[14ch] truncate">{thread.title}</span>
-        <ChevronDown className="size-3.5 opacity-60" />
-      </DropdownMenuTrigger>
-      <DropdownMenuContent
-        align="start"
-        side="top"
-        sideOffset={6}
-        className="max-h-80 w-72 overflow-y-auto p-1"
-      >
-        <button
-          type="button"
-          data-action="assistant-thread-new"
-          onClick={onNew}
-          className="flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-left text-sm hover:bg-accent hover:text-accent-foreground"
-        >
-          <Plus className="size-4" />
-          <span className="font-medium">New conversation</span>
-        </button>
-        <div className="my-1 h-px bg-border" />
-        {sorted.map((t) => {
-          const isActive = t.id === thread.id
-          return (
-            <div
-              key={t.id}
-              className={
-                "group flex items-center gap-1 rounded-md " +
-                (isActive ? "bg-accent" : "")
-              }
-            >
-              <button
-                type="button"
-                data-action={`assistant-thread-switch-${t.id}`}
-                onClick={() => onSwitch(t.id)}
-                className="flex flex-1 flex-col items-start gap-0.5 px-2 py-1.5 text-left text-sm hover:bg-accent hover:text-accent-foreground"
-              >
-                <span className="line-clamp-1 font-medium">{t.title}</span>
-                <span className="text-[11px] text-muted-foreground">
-                  {t.messages.length} msg ·{" "}
-                  {new Date(t.updatedAt).toLocaleDateString()}
-                </span>
-              </button>
-              <button
-                type="button"
-                data-action={`assistant-thread-rename-${t.id}`}
-                onClick={() => {
-                  const next = window.prompt("Rename conversation", t.title)
-                  if (next && next.trim()) onRename(t.id, next.trim())
-                }}
-                className="rounded p-1 text-muted-foreground opacity-0 hover:bg-background hover:text-foreground group-hover:opacity-100"
-                title="Rename"
-                aria-label="Rename"
-              >
-                <Pencil className="size-3.5" />
-              </button>
-              <button
-                type="button"
-                data-action={`assistant-thread-delete-${t.id}`}
-                onClick={() => {
-                  if (threads.length <= 1) return
-                  if (window.confirm(`Delete "${t.title}"?`)) onDelete(t.id)
-                }}
-                disabled={threads.length <= 1}
-                className="rounded p-1 text-muted-foreground opacity-0 hover:bg-destructive/10 hover:text-destructive group-hover:opacity-100 disabled:cursor-not-allowed disabled:opacity-30"
-                title="Delete"
-                aria-label="Delete"
-              >
-                <Trash2 className="size-3.5" />
-              </button>
-            </div>
-          )
-        })}
-      </DropdownMenuContent>
-    </DropdownMenu>
-  )
-}
-
-function agentInitials(name: string | undefined): string {
-  if (!name) return "?"
-  const words = name.trim().split(/\s+/).filter(Boolean)
-  if (words.length === 0) return "?"
-  if (words.length === 1) return words[0].slice(0, 2).toUpperCase()
-  return (words[0][0] + words[words.length - 1][0]).toUpperCase()
-}
-
-function agentTint(id: string): string {
-  // Deterministic OKLCH hue from the id so each persona gets a stable colour.
-  let hash = 0
-  for (let i = 0; i < id.length; i++) {
-    hash = (hash * 31 + id.charCodeAt(i)) | 0
-  }
-  const hue = ((hash % 360) + 360) % 360
-  return `oklch(0.55 0.18 ${hue})`
-}
-
-function StatusDot({ status }: { status: Status }) {
-  const cls =
-    status.kind === "probing"
-      ? "bg-muted-foreground/40"
-      : status.kind === "live"
-        ? "bg-emerald-500 ring-2 ring-emerald-500/25 shadow-[0_0_6px_var(--color-emerald-500)] animate-pulse"
-        : "bg-rose-500 ring-2 ring-rose-500/25"
-  const label =
-    status.kind === "live"
-      ? "Connected"
-      : status.kind === "mock"
-        ? "Disconnected — using mock"
-        : "Probing"
-  return (
-    <span
-      role="status"
-      aria-label={label}
-      title={label}
-      className={`size-2.5 shrink-0 rounded-full ${cls}`}
-      data-status={status.kind}
-    />
-  )
-}
-
-function endpointKind(url: string): "local" | "api" {
-  try {
-    const u = new URL(url)
-    if (
-      u.hostname === "localhost" ||
-      u.hostname === "127.0.0.1" ||
-      u.hostname === "0.0.0.0" ||
-      u.hostname.endsWith(".local")
-    ) {
-      return "local"
-    }
-    return "api"
-  } catch {
-    return "api"
-  }
-}
-
-function KindChip({ kind }: { kind: "local" | "api" | "mock" }) {
-  const styles: Record<typeof kind, string> = {
-    local:
-      "border-emerald-500/40 bg-emerald-500/10 text-emerald-700 dark:text-emerald-300",
-    api: "border-sky-500/40 bg-sky-500/10 text-sky-700 dark:text-sky-300",
-    mock: "border-amber-500/50 bg-amber-500/10 text-amber-700 dark:text-amber-300",
-  }
-  const label = kind === "local" ? "Local" : kind === "api" ? "API" : "Mock"
-  return (
-    <span
-      className={`rounded-full border px-1.5 py-0.5 text-[10px] font-medium uppercase tracking-wide ${styles[kind]}`}
-    >
-      {label}
-    </span>
-  )
-}
-
-function HostChip({ baseURL }: { baseURL: string }) {
-  let host = baseURL.replace(/^https?:\/\//, "")
-  try {
-    const u = new URL(baseURL)
-    host = `${u.hostname}${u.port ? `:${u.port}` : ""}`
-  } catch {
-    /* fall back to stripped string */
-  }
-  return (
-    <span
-      className="rounded-full border bg-muted px-2 py-0.5 font-mono text-[11px] text-muted-foreground"
-      title={baseURL}
-    >
-      {host}
-    </span>
-  )
-}
-
-function EmptyState({ uiControl }: { uiControl: boolean }) {
-  return (
-    <div className="flex h-full flex-col items-center justify-center gap-2 text-center">
-      <p
-        style={{ fontFamily: "var(--font-ai-prose)" }}
-        className="text-lg text-foreground"
-      >
-        {uiControl ? "Tell me what you'd like to do." : "How can I help?"}
-      </p>
-      <p className="text-sm text-muted-foreground">
-        {uiControl
-          ? "I can navigate, click buttons, and fill forms. Watch the cursor."
-          : "Pick a suggestion below or type a question."}
-      </p>
-    </div>
-  )
-}
diff --git a/app/routes/billing.tsx b/app/routes/billing.tsx
new file mode 100644
index 0000000..f577c04
--- /dev/null
+++ b/app/routes/billing.tsx
@@ -0,0 +1,174 @@
+// Billing — the plan catalogue. Per-tenant plan assignment lives on each
+// tenant's detail page (Plan & quotas tab); this is the platform view of what
+// plans exist. Entitlements and Apps aren't wired to endpoints yet, so they're
+// named honestly as still-to-come rather than given their own dead nav items.
+
+import { useCallback, useEffect, useState } from "react"
+import { Gauge, LayoutGrid, RefreshCw } from "lucide-react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+
+import { AppShell } from "~/components/layout/app-shell"
+import { PageHeader } from "~/components/layout/page-header"
+import { DataState } from "~/components/data-state"
+import { Button } from "~/components/ui/button"
+import {
+  Card,
+  CardContent,
+  CardDescription,
+  CardHeader,
+  CardTitle,
+} from "~/components/ui/card"
+import { EmptyState } from "@crema/feedback-ui"
+import { listPlans, type Plan } from "~/lib/arcadia/billing"
+import { pageTitle } from "~/lib/page-meta"
+import { useSession } from "~/lib/session"
+
+export const meta = () => pageTitle("Billing")
+
+export default function BillingRoute() {
+  const session = useSession()
+  const arcadia = useArcadiaClient()
+  const [plans, setPlans] = useState<Plan[]>([])
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<unknown>(null)
+
+  const refresh = useCallback(async () => {
+    setError(null)
+    setLoading(true)
+    try {
+      setPlans(await listPlans(arcadia))
+    } catch (err) {
+      setError(err)
+    } finally {
+      setLoading(false)
+    }
+  }, [arcadia])
+
+  useEffect(() => {
+    if (session) refresh()
+  }, [session, refresh])
+
+  return (
+    <AppShell>
+      <PageHeader
+        title="Billing"
+        description="The plans tenants can be placed on. Assign a plan to a tenant from its detail page."
+        actions={
+          <Button
+            variant="outline"
+            size="sm"
+            onClick={refresh}
+            disabled={loading}
+            data-action="billing-refresh"
+          >
+            <RefreshCw className={`size-4 ${loading ? "animate-spin" : ""}`} />
+            Refresh
+          </Button>
+        }
+      />
+
+      <Card>
+        <CardHeader>
+          <CardTitle>Plan catalogue</CardTitle>
+          <CardDescription>
+            {plans.length} plan{plans.length === 1 ? "" : "s"} defined.
+          </CardDescription>
+        </CardHeader>
+        <CardContent className="p-0">
+          <DataState
+            loading={loading}
+            error={error}
+            isEmpty={plans.length === 0}
+            onRetry={refresh}
+            loadingLabel="Loading plans…"
+            empty={
+              <EmptyState
+                title="No plans defined"
+                description="Plans are created in arcadia-core. Once they exist, set a tenant's plan from its Plan & quotas tab."
+                className="py-12"
+              />
+            }
+          >
+            <ul className="divide-y">
+              {plans.map((plan) => (
+                <li key={plan.slug} className="flex flex-col gap-1 px-4 py-3">
+                  <div className="flex flex-wrap items-center gap-2">
+                    <span className="font-medium">{plan.name}</span>
+                    <code className="rounded bg-muted px-1.5 py-0.5 font-mono text-xs">
+                      {plan.slug}
+                    </code>
+                    <span className="text-xs text-muted-foreground">{plan.billing_track}</span>
+                    {plan.trial_days > 0 ? (
+                      <span className="text-xs text-muted-foreground">
+                        · {plan.trial_days}-day trial
+                      </span>
+                    ) : null}
+                  </div>
+                  {plan.description ? (
+                    <p className="text-sm text-muted-foreground">{plan.description}</p>
+                  ) : null}
+                  {plan.meters.length > 0 ? (
+                    <div className="mt-1 flex flex-wrap gap-1.5">
+                      {plan.meters.map((m) => (
+                        <span
+                          key={m.meter_key}
+                          className="rounded-md border bg-card/40 px-2 py-0.5 text-xs text-muted-foreground"
+                        >
+                          {m.meter_key}
+                          {m.included_units != null ? `: ${m.included_units} incl.` : ""}
+                        </span>
+                      ))}
+                    </div>
+                  ) : null}
+                </li>
+              ))}
+            </ul>
+          </DataState>
+        </CardContent>
+      </Card>
+
+      <div className="grid gap-3 sm:grid-cols-2">
+        <ComingSoon
+          icon={Gauge}
+          title="Entitlements"
+          description="A tenant-rollup of metered allowances and usage. Per-tenant usage is on each tenant's Plan & quotas tab today; the platform rollup endpoint is pending."
+        />
+        <ComingSoon
+          icon={LayoutGrid}
+          title="Apps"
+          description="Apps a tenant publishes and their per-app grants. Awaiting the catalog endpoint."
+        />
+      </div>
+    </AppShell>
+  )
+}
+
+function ComingSoon({
+  icon: Icon,
+  title,
+  description,
+}: {
+  icon: React.ComponentType<{ className?: string }>
+  title: string
+  description: string
+}) {
+  return (
+    <div className="flex items-start gap-3 rounded-lg border bg-card/40 px-4 py-3">
+      <div className="flex size-9 shrink-0 items-center justify-center rounded-lg bg-muted text-muted-foreground">
+        <Icon className="size-4" />
+      </div>
+      <div className="min-w-0">
+        <div className="flex items-center gap-2">
+          <p className="font-medium">{title}</p>
+          <span className="rounded bg-muted px-1.5 py-0.5 text-[10px] uppercase tracking-wider text-muted-foreground">
+            Soon
+          </span>
+        </div>
+        <p className="mt-0.5 text-sm text-muted-foreground">{description}</p>
+      </div>
+    </div>
+  )
+}
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/buckets.tsx b/app/routes/buckets.tsx
index cfe4ff2..d505289 100644
--- a/app/routes/buckets.tsx
+++ b/app/routes/buckets.tsx
@@ -17,7 +17,8 @@ import {
   Trash2,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   DataTable,
@@ -28,11 +29,13 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { EmptyState } from "@crema/feedback-ui"
 import { FileGrid, FileList, formatBytes, type FileItem } from "@crema/file-ui"
 import { KpiTile, formatCompact } from "@crema/dashboard-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
 import {
@@ -102,6 +105,7 @@ type Editor =
 export default function BucketsRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
   const [configs, setConfigs] = useState<StorageConfig[]>([])
   const [configId, setConfigId] = useState<string>(() =>
@@ -111,8 +115,13 @@ export default function BucketsRoute() {
   )
   const [buckets, setBuckets] = useState<Bucket[]>([])
   const [loading, setLoading] = useState(false)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // Two independently-loaded lists, two error slots. A dead /storage_configs
+  // must not read as "no buckets", and a dead /buckets must not blank the
+  // config picker.
+  const [error, setError] = useState<unknown>(null)
+  const [configsError, setConfigsError] = useState<unknown>(null)
+  const [configsLoading, setConfigsLoading] = useState(true)
+  const [configsReloadKey, setConfigsReloadKey] = useState(0)
   const [view, setView] = useState<View>({ kind: "list" })
   const [editor, setEditor] = useState<Editor>(null)
   const [pendingDelete, setPendingDelete] = useState<Bucket | null>(null)
@@ -126,6 +135,8 @@ export default function BucketsRoute() {
   useEffect(() => {
     if (!session) return
     let mounted = true
+    setConfigsLoading(true)
+    setConfigsError(null)
     listStorageConfigs(arcadia)
       .then((rows) => {
         if (!mounted) return
@@ -142,16 +153,17 @@ export default function BucketsRoute() {
           setConfigId(def?.id ?? "")
         }
       })
-      .catch((err) =>
-        setError(
-          err instanceof ArcadiaError ? err.message : "Failed to load storage configs.",
-        ),
-      )
+      .catch((err) => {
+        if (mounted) setConfigsError(err)
+      })
+      .finally(() => {
+        if (mounted) setConfigsLoading(false)
+      })
     return () => {
       mounted = false
     }
     // eslint-disable-next-line react-hooks/exhaustive-deps
-  }, [session, arcadia])
+  }, [session, arcadia, configsReloadKey])
 
   useEffect(() => {
     if (configId) localStorage.setItem(SELECTED_CONFIG_KEY, configId)
@@ -167,7 +179,7 @@ export default function BucketsRoute() {
     try {
       setBuckets(await listBuckets(arcadia, configId))
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load buckets.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -177,6 +189,14 @@ export default function BucketsRoute() {
     refresh()
   }, [refresh])
 
+  // The buckets table can't do its job without a config, so a failed config
+  // load surfaces there too — otherwise it would read as "pick a config" with
+  // an empty picker and no explanation.
+  const retryAll = useCallback(() => {
+    setConfigsReloadKey((n) => n + 1)
+    refresh()
+  }, [refresh])
+
   const summary = useMemo(
     () => ({
       storage_config: activeConfig
@@ -249,17 +269,6 @@ export default function BucketsRoute() {
           </div>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         {view.kind === "list" ? (
           <>
             <Card>
@@ -317,7 +326,9 @@ export default function BucketsRoute() {
 
             <BucketsTable
               buckets={buckets}
-              loading={loading}
+              loading={loading || configsLoading}
+              error={error ?? configsError}
+              onRetry={retryAll}
               hasConfig={!!configId}
               onOpen={(b) => setView({ kind: "objects", bucket: b })}
               onConfigure={(b) => setEditor({ kind: "configure", bucket: b })}
@@ -325,11 +336,7 @@ export default function BucketsRoute() {
             />
           </>
         ) : (
-          <ObjectBrowser
-            storageConfigId={configId}
-            bucket={view.bucket}
-            onError={setError}
-          />
+          <ObjectBrowser storageConfigId={configId} bucket={view.bucket} />
         )}
       </div>
 
@@ -338,12 +345,11 @@ export default function BucketsRoute() {
         open={editor?.kind === "create"}
         configId={configId}
         onClose={() => setEditor(null)}
-        onCreated={async (msg) => {
+        onCreated={async (name) => {
           setEditor(null)
-          if (msg) setInfo(msg)
           await refresh()
+          toast.success(`Created bucket ${name}`)
         }}
-        onError={setError}
       />
 
       {/* Configure (versioning / CORS / policy) */}
@@ -352,10 +358,9 @@ export default function BucketsRoute() {
         configId={configId}
         onClose={() => setEditor(null)}
         onChanged={async (msg) => {
-          if (msg) setInfo(msg)
           await refresh()
+          toast.success(msg)
         }}
-        onError={setError}
       />
 
       {/* Delete */}
@@ -363,12 +368,11 @@ export default function BucketsRoute() {
         bucket={pendingDelete}
         configId={configId}
         onClose={() => setPendingDelete(null)}
-        onDeleted={async (msg) => {
+        onDeleted={async (name) => {
           setPendingDelete(null)
-          if (msg) setInfo(msg)
           await refresh()
+          toast.success(`Deleted bucket ${name}`)
         }}
-        onError={setError}
       />
     </AppShell>
   )
@@ -379,6 +383,8 @@ export default function BucketsRoute() {
 function BucketsTable({
   buckets,
   loading,
+  error,
+  onRetry,
   hasConfig,
   onOpen,
   onConfigure,
@@ -386,6 +392,9 @@ function BucketsTable({
 }: {
   buckets: Bucket[]
   loading: boolean
+  /** Raw thrown value from either the buckets load or the configs load. */
+  error: unknown
+  onRetry: () => void
   hasConfig: boolean
   onOpen: (b: Bucket) => void
   onConfigure: (b: Bucket) => void
@@ -525,41 +534,47 @@ function BucketsTable({
       </CardHeader>
 
       <CardContent className="relative p-0">
-        <LoadingOverlay active={loading && buckets.length === 0} label="Loading buckets…" />
-        {!hasConfig ? (
-          <EmptyState
-            icon={<Boxes className="size-6" />}
-            title="Pick a storage configuration"
-            description="Buckets are scoped to a credential. Add one under Storage if you don't have any yet."
-            className="py-12"
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={table.total === 0}
+          onRetry={onRetry}
+          loadingLabel="Loading buckets…"
+          empty={
+            !hasConfig ? (
+              <EmptyState
+                icon={<Boxes className="size-6" />}
+                title="Pick a storage configuration"
+                description="Buckets are scoped to a credential. Add one under Storage if you don't have any yet."
+                className="py-12"
+              />
+            ) : (
+              <EmptyState
+                icon={<Boxes className="size-6" />}
+                title={search ? "No buckets match." : "No buckets in this account."}
+                description={search ? "Try a different search." : "Create your first bucket."}
+                className="py-12"
+              />
+            )
+          }
+        >
+          <DataTable
+            columns={columns}
+            rows={table.pageRows}
+            getRowId={(b) => b.name}
+            sort={table.sort}
+            onSortToggle={table.toggleSort}
+            loading={loading && buckets.length > 0}
+            stickyHeader
           />
-        ) : table.total === 0 && !loading ? (
-          <EmptyState
-            icon={<Boxes className="size-6" />}
-            title={search ? "No buckets match." : "No buckets in this account."}
-            description={search ? "Try a different search." : "Create your first bucket."}
-            className="py-12"
+          <Pagination
+            page={table.page}
+            pageSize={table.pageSize}
+            total={table.total}
+            onPageChange={table.setPage}
+            onPageSizeChange={table.setPageSize}
           />
-        ) : (
-          <>
-            <DataTable
-              columns={columns}
-              rows={table.pageRows}
-              getRowId={(b) => b.name}
-              sort={table.sort}
-              onSortToggle={table.toggleSort}
-              loading={loading && buckets.length > 0}
-              stickyHeader
-            />
-            <Pagination
-              page={table.page}
-              pageSize={table.pageSize}
-              total={table.total}
-              onPageChange={table.setPage}
-              onPageSizeChange={table.setPageSize}
-            />
-          </>
-        )}
+        </DataState>
       </CardContent>
     </Card>
   )
@@ -570,23 +585,25 @@ function BucketsTable({
 function ObjectBrowser({
   storageConfigId,
   bucket,
-  onError,
 }: {
   storageConfigId: string
   bucket: Bucket
-  onError: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const [objects, setObjects] = useState<BucketObject[]>([])
   const [prefix, setPrefix] = useState("")
   const [loading, setLoading] = useState(true)
+  // The object listing owns its failure: a 403 on this bucket must not read as
+  // "Empty bucket."
+  const [error, setError] = useState<unknown>(null)
   const [layout, setLayout] = useState<"grid" | "list">("list")
   const [previewUrl, setPreviewUrl] = useState<{ url: string; key: string } | null>(null)
   const [search, setSearch] = useState("")
 
   const refresh = useCallback(async () => {
     setLoading(true)
-    onError(null)
+    setError(null)
     try {
       const res = await listObjects(arcadia, {
         storage_config_id: storageConfigId,
@@ -596,11 +613,11 @@ function ObjectBrowser({
       })
       setObjects(res.objects ?? [])
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Failed to load objects.")
+      setError(err)
     } finally {
       setLoading(false)
     }
-  }, [arcadia, storageConfigId, bucket.name, prefix, onError])
+  }, [arcadia, storageConfigId, bucket.name, prefix])
 
   useEffect(() => {
     refresh()
@@ -635,10 +652,10 @@ function ObjectBrowser({
         })
         setPreviewUrl({ url: res.url, key })
       } catch (err) {
-        onError(err instanceof ArcadiaError ? err.message : "Presign failed.")
+        toast.error(errorMessage(err, `sign a link for ${key}`))
       }
     },
-    [arcadia, storageConfigId, bucket.name, onError],
+    [arcadia, storageConfigId, bucket.name, toast],
   )
 
   return (
@@ -697,44 +714,52 @@ function ObjectBrowser({
       </CardHeader>
 
       <CardContent className="relative p-4">
-        <LoadingOverlay active={loading && objects.length === 0} label="Loading objects…" />
-        {fileItems.length === 0 && !loading ? (
-          <EmptyState
-            icon={<FolderOpen className="size-6" />}
-            title={search || prefix ? "No matches." : "Empty bucket."}
-            description={
-              search || prefix
-                ? "Adjust the filter or prefix."
-                : "Upload an object via your application; this view is read-only for now."
-            }
-            className="py-12"
-          />
-        ) : layout === "list" ? (
-          <FileList
-            files={fileItems}
-            onItemClick={(f) => openPresigned(f.id)}
-            renderAction={(f) => (
-              <Button
-                size="sm"
-                variant="ghost"
-                onClick={(e) => {
-                  e.stopPropagation()
-                  openPresigned(f.id)
-                }}
-                data-action={`object-${f.id}-presign`}
-              >
-                <ExternalLink className="size-3.5" />
-                Link
-              </Button>
-            )}
-          />
-        ) : (
-          <FileGrid
-            files={fileItems}
-            onItemClick={(f) => openPresigned(f.id)}
-            minItemWidth={180}
-          />
-        )}
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={fileItems.length === 0}
+          onRetry={refresh}
+          loadingLabel="Loading objects…"
+          empty={
+            <EmptyState
+              icon={<FolderOpen className="size-6" />}
+              title={search || prefix ? "No matches." : "Empty bucket."}
+              description={
+                search || prefix
+                  ? "Adjust the filter or prefix."
+                  : "Upload an object via your application; this view is read-only for now."
+              }
+              className="py-12"
+            />
+          }
+        >
+          {layout === "list" ? (
+            <FileList
+              files={fileItems}
+              onItemClick={(f) => openPresigned(f.id)}
+              renderAction={(f) => (
+                <Button
+                  size="sm"
+                  variant="ghost"
+                  onClick={(e) => {
+                    e.stopPropagation()
+                    openPresigned(f.id)
+                  }}
+                  data-action={`object-${f.id}-presign`}
+                >
+                  <ExternalLink className="size-3.5" />
+                  Link
+                </Button>
+              )}
+            />
+          ) : (
+            <FileGrid
+              files={fileItems}
+              onItemClick={(f) => openPresigned(f.id)}
+              minItemWidth={180}
+            />
+          )}
+        </DataState>
       </CardContent>
 
       <PresignDialog reveal={previewUrl} onClose={() => setPreviewUrl(null)} />
@@ -812,13 +837,11 @@ function CreateBucketDialog({
   configId,
   onClose,
   onCreated,
-  onError,
 }: {
   open: boolean
   configId: string
   onClose: () => void
-  onCreated: (msg?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onCreated: (name: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const [name, setName] = useState("")
@@ -827,6 +850,10 @@ function CreateBucketDialog({
   const [versioning, setVersioning] = useState(false)
   const [regions, setRegions] = useState<string[]>([])
   const [saving, setSaving] = useState(false)
+  // "Bucket names must be globally unique" is the single most likely failure
+  // here, and the provider's message is the only thing that explains it — so
+  // it renders in the dialog, next to the name the operator chose.
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!open) {
@@ -834,8 +861,10 @@ function CreateBucketDialog({
       setRegion("")
       setAcl("private")
       setVersioning(false)
+      setError(null)
       return
     }
+    setError(null)
     if (configId) {
       listRegions(arcadia, configId)
         .then(setRegions)
@@ -844,7 +873,7 @@ function CreateBucketDialog({
   }, [open, arcadia, configId])
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       await createBucket(arcadia, {
@@ -854,15 +883,9 @@ function CreateBucketDialog({
         acl,
         versioning,
       })
-      await onCreated(`Bucket ${name} created.`)
+      await onCreated(name)
     } catch (err) {
-      onError(
-        err instanceof ArcadiaError
-          ? err.message
-          : err instanceof Error
-            ? err.message
-            : "Create failed.",
-      )
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -942,6 +965,8 @@ function CreateBucketDialog({
           </div>
         </div>
 
+        {error ? <DialogError error={error} context="create the bucket" /> : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} disabled={saving} data-action="bucket-form-cancel">
             Cancel
@@ -961,13 +986,11 @@ function ConfigureBucketDialog({
   configId,
   onClose,
   onChanged,
-  onError,
 }: {
   state: { kind: "configure"; bucket: Bucket } | null
   configId: string
   onClose: () => void
-  onChanged: (msg?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onChanged: (msg: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const [versioningOn, setVersioningOn] = useState(false)
@@ -976,38 +999,58 @@ function ConfigureBucketDialog({
   const [corsRules, setCorsRules] = useState<CorsRule[]>([])
   const [corsSaving, setCorsSaving] = useState(false)
   const [corsLoading, setCorsLoading] = useState(false)
+  // The CORS load used to fail *silently* into an empty rule list — so a 500
+  // looked exactly like "this bucket has no CORS rules", and saving from that
+  // state would have wiped the real ones.
+  const [corsError, setCorsError] = useState<unknown>(null)
+  const [corsReloadKey, setCorsReloadKey] = useState(0)
 
   const [policyText, setPolicyText] = useState("")
   const [policySaving, setPolicySaving] = useState(false)
 
+  // Each section saves independently, so each failure speaks in its own tab.
+  const [error, setError] = useState<unknown>(null)
+  const [errorContext, setErrorContext] = useState("save")
+
   const open = state !== null
 
   useEffect(() => {
     if (!open || !state) return
     setCorsLoading(true)
+    setCorsError(null)
     getCors(arcadia, configId, state.bucket.name)
       .then((res) => {
         setCorsRules(res?.rules ?? [])
       })
-      .catch(() => setCorsRules([]))
+      .catch((err) => {
+        setCorsRules([])
+        setCorsError(err)
+      })
       .finally(() => setCorsLoading(false))
-  }, [open, state, arcadia, configId])
+  }, [open, state, arcadia, configId, corsReloadKey])
 
   if (!state) return null
   const { bucket } = state
 
+  const fail = (err: unknown, context: string) => {
+    setError(err)
+    setErrorContext(context)
+  }
+
   const saveVersioning = async () => {
     setVersioningSaving(true)
-    onError(null)
+    setError(null)
     try {
       await configureVersioning(arcadia, {
         storage_config_id: configId,
         bucket_name: bucket.name,
         enabled: versioningOn,
       })
-      await onChanged(`Versioning ${versioningOn ? "enabled" : "suspended"}.`)
+      await onChanged(
+        `${versioningOn ? "Enabled" : "Suspended"} versioning on ${bucket.name}`,
+      )
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Save failed.")
+      fail(err, `save versioning on ${bucket.name}`)
     } finally {
       setVersioningSaving(false)
     }
@@ -1015,16 +1058,16 @@ function ConfigureBucketDialog({
 
   const saveCors = async () => {
     setCorsSaving(true)
-    onError(null)
+    setError(null)
     try {
       await configureCors(arcadia, {
         storage_config_id: configId,
         bucket_name: bucket.name,
         rules: corsRules,
       })
-      await onChanged("CORS rules saved.")
+      await onChanged(`Saved CORS rules on ${bucket.name}`)
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Save failed.")
+      fail(err, `save the CORS rules on ${bucket.name}`)
     } finally {
       setCorsSaving(false)
     }
@@ -1032,23 +1075,19 @@ function ConfigureBucketDialog({
 
   const savePolicy = async () => {
     setPolicySaving(true)
-    onError(null)
+    setError(null)
     try {
+      // Parsed here so malformed JSON never reaches the API — and so the
+      // SyntaxError describeError() surfaces names the real problem.
       const policy = policyText.trim() === "" ? {} : JSON.parse(policyText)
       await configurePolicy(arcadia, {
         storage_config_id: configId,
         bucket_name: bucket.name,
         policy,
       })
-      await onChanged("Bucket policy saved.")
+      await onChanged(`Saved the bucket policy on ${bucket.name}`)
     } catch (err) {
-      onError(
-        err instanceof ArcadiaError
-          ? err.message
-          : err instanceof Error
-            ? `Invalid JSON or save failed: ${err.message}`
-            : "Save failed.",
-      )
+      fail(err, `save the bucket policy on ${bucket.name}`)
     } finally {
       setPolicySaving(false)
     }
@@ -1112,16 +1151,22 @@ function ConfigureBucketDialog({
           </TabsContent>
 
           <TabsContent value="cors" className="pt-4">
-            {corsLoading ? (
-              <p className="py-4 text-center text-sm text-muted-foreground">
-                <RefreshCw className="mr-1 inline size-3.5 animate-spin" /> Loading rules…
-              </p>
-            ) : (
+            <DataState
+              loading={corsLoading}
+              error={corsError}
+              isEmpty={corsRules.length === 0}
+              onRetry={() => setCorsReloadKey((n) => n + 1)}
+              loadingLabel="Loading CORS rules…"
+              // A bucket with no rules is a real, reachable state — CorsEditor
+              // already says so. It just must never be shown for a failed read.
+              empty={<CorsEditor rules={[]} onChange={setCorsRules} />}
+            >
               <CorsEditor rules={corsRules} onChange={setCorsRules} />
-            )}
+            </DataState>
             <div className="mt-3 flex justify-end gap-2">
               <Button
                 variant="outline"
+                disabled={corsLoading || !!corsError}
                 onClick={() =>
                   setCorsRules([
                     ...corsRules,
@@ -1140,7 +1185,9 @@ function ConfigureBucketDialog({
               </Button>
               <Button
                 onClick={saveCors}
-                disabled={corsSaving}
+                // Saving rules we never managed to read would silently wipe
+                // whatever is actually on the bucket.
+                disabled={corsSaving || corsLoading || !!corsError}
                 data-action="configure-cors-save"
               >
                 {corsSaving ? <RefreshCw className="size-4 animate-spin" /> : <CheckCircle2 className="size-4" />}
@@ -1182,6 +1229,8 @@ function ConfigureBucketDialog({
           </TabsContent>
         </Tabs>
 
+        {error ? <DialogError error={error} context={errorContext} /> : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} data-action="configure-close">
             Close
@@ -1303,38 +1352,38 @@ function DeleteBucketFlow({
   configId,
   onClose,
   onDeleted,
-  onError,
 }: {
   bucket: Bucket | null
   configId: string
   onClose: () => void
-  onDeleted: (msg?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onDeleted: (name: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const [code, setCode] = useState("")
   const [forceEmpty, setForceEmpty] = useState(false)
   const [issuingCode, setIssuingCode] = useState(false)
   const [deleting, setDeleting] = useState(false)
+  // A refused delete (wrong code, bucket not empty) has to be readable right
+  // where the operator typed the code — this dialog is the whole confirmation.
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!bucket) {
       setCode("")
       setForceEmpty(false)
     }
+    setError(null)
   }, [bucket])
 
   const requestCode = async () => {
     if (!bucket) return
     setIssuingCode(true)
-    onError(null)
+    setError(null)
     try {
       const res = await generateConfirmationCode(arcadia, configId, bucket.name)
       setCode(res.code ?? "")
     } catch (err) {
-      onError(
-        err instanceof ArcadiaError ? err.message : "Failed to generate confirmation code.",
-      )
+      setError(err)
     } finally {
       setIssuingCode(false)
     }
@@ -1343,7 +1392,7 @@ function DeleteBucketFlow({
   const doDelete = async () => {
     if (!bucket) return
     setDeleting(true)
-    onError(null)
+    setError(null)
     try {
       await deleteBucket(arcadia, {
         storage_config_id: configId,
@@ -1352,9 +1401,9 @@ function DeleteBucketFlow({
         force_empty: forceEmpty,
         dry_run: false,
       })
-      await onDeleted(`${bucket.name} deleted.`)
+      await onDeleted(bucket.name)
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Delete failed.")
+      setError(err)
     } finally {
       setDeleting(false)
     }
@@ -1417,8 +1466,20 @@ function DeleteBucketFlow({
           </div>
         </div>
 
+        {error ? (
+          <DialogError
+            error={error}
+            context={bucket ? `delete ${bucket.name}` : "delete the bucket"}
+          />
+        ) : null}
+
         <DialogFooter>
-          <Button variant="outline" onClick={onClose} disabled={deleting}>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            disabled={deleting}
+            data-action="bucket-delete-cancel"
+          >
             Cancel
           </Button>
           <Button
@@ -1468,3 +1529,5 @@ function guessMime(key: string): string {
   }
   return m[ext] ?? "application/octet-stream"
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/entitlements.tsx b/app/routes/entitlements.tsx
deleted file mode 100644
index 02af7f3..0000000
--- a/app/routes/entitlements.tsx
+++ /dev/null
@@ -1,42 +0,0 @@
-// Tenant entitlements — placeholder. Lists the metered allowances
-// (AI tokens, storage GB, etc.) granted to the active tenant and how
-// much of each has been consumed. Data source not wired yet.
-
-import { Gauge } from "lucide-react"
-import { AppShell } from "~/components/layout/app-shell"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-} from "~/components/ui/card"
-
-export default function EntitlementsRoute() {
-  return (
-    <AppShell>
-      <div className="flex items-center gap-3">
-        <div className="flex size-10 items-center justify-center rounded-lg bg-primary/10 text-primary">
-          <Gauge className="size-5" />
-        </div>
-        <div>
-          <h1 className="text-2xl font-semibold">Entitlements</h1>
-          <p className="text-sm text-muted-foreground">
-            Metered allowances for this tenant — included units and usage to
-            date per meter.
-          </p>
-        </div>
-      </div>
-      <Card>
-        <CardHeader>
-          <CardTitle>Coming soon</CardTitle>
-          <CardDescription>
-            Personal-cloud entitlements are tracked per account today. A
-            tenant-rollup endpoint is pending.
-          </CardDescription>
-        </CardHeader>
-        <CardContent />
-      </Card>
-    </AppShell>
-  )
-}
diff --git a/app/routes/feature-flags.tsx b/app/routes/feature-flags.tsx
new file mode 100644
index 0000000..e321951
--- /dev/null
+++ b/app/routes/feature-flags.tsx
@@ -0,0 +1,365 @@
+import { useCallback, useEffect, useState, type FormEvent } from "react"
+import { Plus, RefreshCw, Trash2 } from "lucide-react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
+
+import { AppShell } from "~/components/layout/app-shell"
+import { PageHeader } from "~/components/layout/page-header"
+import { DataState, DialogError } from "~/components/data-state"
+import { Button } from "~/components/ui/button"
+import {
+  Card,
+  CardContent,
+  CardHeader,
+} from "~/components/ui/card"
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "~/components/ui/dialog"
+import { Input } from "~/components/ui/input"
+import { Label } from "~/components/ui/label"
+import { Switch } from "~/components/ui/switch"
+import {
+  createPlatformFlag,
+  deletePlatformFlag,
+  listPlatformFlags,
+  updatePlatformFlag,
+  type PlatformFlag,
+} from "~/lib/arcadia/feature-flags"
+import { errorMessage } from "~/lib/errors"
+import { pageTitle } from "~/lib/page-meta"
+import { useSession } from "~/lib/session"
+
+export const meta = () => pageTitle("Feature flags")
+
+export default function FeatureFlagsRoute() {
+  const session = useSession()
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+
+  const [flags, setFlags] = useState<PlatformFlag[]>([])
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<unknown>(null)
+  const [editorOpen, setEditorOpen] = useState(false)
+  const [editing, setEditing] = useState<PlatformFlag | null>(null)
+  const [pendingDelete, setPendingDelete] = useState<PlatformFlag | null>(null)
+  const [busy, setBusy] = useState<string | null>(null)
+
+  const refresh = useCallback(async () => {
+    setError(null)
+    setLoading(true)
+    try {
+      setFlags(await listPlatformFlags(arcadia))
+    } catch (err) {
+      setError(err)
+    } finally {
+      setLoading(false)
+    }
+  }, [arcadia])
+
+  useEffect(() => {
+    if (session) refresh()
+  }, [session, refresh])
+
+  const toggleDefault = async (flag: PlatformFlag, next: boolean) => {
+    setBusy(flag.id)
+    setFlags((prev) =>
+      prev.map((f) => (f.id === flag.id ? { ...f, enabled_by_default: next } : f)),
+    )
+    try {
+      await updatePlatformFlag(arcadia, flag.id, { enabled_by_default: next })
+      toast.success(`${flag.key} defaults to ${next ? "on" : "off"}`)
+    } catch (err) {
+      setFlags((prev) => prev.map((f) => (f.id === flag.id ? flag : f)))
+      toast.error(errorMessage(err, `update ${flag.key}`))
+    } finally {
+      setBusy(null)
+    }
+  }
+
+  const remove = async () => {
+    if (!pendingDelete) return
+    const flag = pendingDelete
+    try {
+      await deletePlatformFlag(arcadia, flag.id)
+      setPendingDelete(null)
+      await refresh()
+      toast.success(`Deleted flag ${flag.key}`)
+    } catch (err) {
+      setPendingDelete(null)
+      toast.error(errorMessage(err, `delete ${flag.key}`))
+    }
+  }
+
+  return (
+    <AppShell>
+      <PageHeader
+        title="Feature flags"
+        description="Platform-wide flags. Each defines a switch that every tenant inherits by default and can override from its own settings."
+        actions={
+          <>
+            <Button
+              variant="outline"
+              size="sm"
+              onClick={refresh}
+              disabled={loading}
+              data-action="feature-flags-refresh"
+            >
+              <RefreshCw className={`size-4 ${loading ? "animate-spin" : ""}`} />
+              Refresh
+            </Button>
+            <Button
+              size="sm"
+              onClick={() => {
+                setEditing(null)
+                setEditorOpen(true)
+              }}
+              data-action="feature-flags-create"
+            >
+              <Plus className="size-4" />
+              New flag
+            </Button>
+          </>
+        }
+      />
+
+      <Card>
+        <CardHeader className="text-xs text-muted-foreground">
+          {flags.length} flag{flags.length === 1 ? "" : "s"}
+        </CardHeader>
+        <CardContent className="p-0">
+          <DataState
+            loading={loading}
+            error={error}
+            isEmpty={flags.length === 0}
+            onRetry={refresh}
+            loadingLabel="Loading feature flags…"
+            empty={
+              <EmptyState
+                title="No feature flags yet"
+                description="Create a flag to gate a feature across the platform. Tenants inherit its default and can override it per-tenant."
+                className="py-12"
+              />
+            }
+          >
+            <ul className="divide-y">
+              {flags.map((flag) => (
+                <li key={flag.id} className="flex items-center gap-3 px-4 py-3">
+                  <button
+                    type="button"
+                    className="min-w-0 flex-1 text-left"
+                    onClick={() => {
+                      setEditing(flag)
+                      setEditorOpen(true)
+                    }}
+                    data-action={`feature-flag-${flag.key}-edit`}
+                  >
+                    <code className="font-mono text-sm">{flag.key}</code>
+                    {flag.description ? (
+                      <p className="mt-0.5 truncate text-xs text-muted-foreground">
+                        {flag.description}
+                      </p>
+                    ) : null}
+                  </button>
+
+                  <div className="flex items-center gap-2 text-xs text-muted-foreground">
+                    <span>Default</span>
+                    <Switch
+                      checked={flag.enabled_by_default}
+                      onCheckedChange={(v) => toggleDefault(flag, v)}
+                      disabled={busy === flag.id}
+                      data-action={`feature-flag-${flag.key}-default`}
+                      aria-label={`Default for ${flag.key}`}
+                    />
+                  </div>
+
+                  <Button
+                    variant="ghost"
+                    size="icon-sm"
+                    onClick={() => setPendingDelete(flag)}
+                    aria-label={`Delete ${flag.key}`}
+                    data-action={`feature-flag-${flag.key}-delete`}
+                  >
+                    <Trash2 className="size-4" />
+                  </Button>
+                </li>
+              ))}
+            </ul>
+          </DataState>
+        </CardContent>
+      </Card>
+
+      <FlagEditorDialog
+        open={editorOpen}
+        flag={editing}
+        onClose={() => setEditorOpen(false)}
+        onSaved={async (msg) => {
+          setEditorOpen(false)
+          await refresh()
+          toast.success(msg)
+        }}
+      />
+
+      <ConfirmDialog
+        open={!!pendingDelete}
+        onOpenChange={(o) => !o && setPendingDelete(null)}
+        title="Delete feature flag?"
+        description={
+          pendingDelete
+            ? `"${pendingDelete.key}" and every tenant's override of it are removed. Any code still reading this flag falls back to its built-in default.`
+            : ""
+        }
+        confirmLabel="Delete"
+        variant="danger"
+        onConfirm={remove}
+      />
+    </AppShell>
+  )
+}
+
+function FlagEditorDialog({
+  open,
+  flag,
+  onClose,
+  onSaved,
+}: {
+  open: boolean
+  flag: PlatformFlag | null
+  onClose: () => void
+  onSaved: (message: string) => void
+}) {
+  const arcadia = useArcadiaClient()
+  const isEdit = !!flag
+  const [key, setKey] = useState("")
+  const [description, setDescription] = useState("")
+  const [enabledByDefault, setEnabledByDefault] = useState(false)
+  const [submitting, setSubmitting] = useState(false)
+  const [error, setError] = useState<unknown>(null)
+
+  useEffect(() => {
+    if (open) {
+      setKey(flag?.key ?? "")
+      setDescription(flag?.description ?? "")
+      setEnabledByDefault(flag?.enabled_by_default ?? false)
+      setError(null)
+      setSubmitting(false)
+    }
+  }, [open, flag])
+
+  const keyInvalid = key.length > 0 && !/^[a-z0-9_]+$/.test(key)
+  const canSubmit = !submitting && key.trim().length > 0 && !keyInvalid
+
+  async function handleSubmit(e: FormEvent) {
+    e.preventDefault()
+    if (!canSubmit) return
+    setSubmitting(true)
+    setError(null)
+    try {
+      if (isEdit) {
+        await updatePlatformFlag(arcadia, flag!.id, {
+          description: description.trim() || null,
+          enabled_by_default: enabledByDefault,
+        })
+        onSaved(`Updated flag ${flag!.key}`)
+      } else {
+        await createPlatformFlag(arcadia, {
+          key: key.trim(),
+          description: description.trim() || null,
+          enabled_by_default: enabledByDefault,
+        })
+        onSaved(`Created flag ${key.trim()}`)
+      }
+    } catch (err) {
+      setError(err)
+      setSubmitting(false)
+    }
+  }
+
+  return (
+    <Dialog open={open} onOpenChange={(o) => !o && onClose()}>
+      <DialogContent className="sm:max-w-md">
+        <form onSubmit={handleSubmit}>
+          <DialogHeader>
+            <DialogTitle>{isEdit ? "Edit flag" : "New feature flag"}</DialogTitle>
+            <DialogDescription>
+              {isEdit
+                ? "The key is fixed once created — code references it."
+                : "The key is how code references this flag; it can't change later."}
+            </DialogDescription>
+          </DialogHeader>
+
+          <div className="space-y-4 py-4">
+            <div className="space-y-2">
+              <Label htmlFor="flag-key">Key</Label>
+              <Input
+                id="flag-key"
+                value={key}
+                onChange={(e) => setKey(e.target.value)}
+                placeholder="new_dashboard"
+                autoFocus={!isEdit}
+                disabled={isEdit}
+                className="font-mono"
+                data-action="feature-flag-form-key"
+              />
+              <p className="text-xs text-muted-foreground">
+                {keyInvalid
+                  ? "Lowercase letters, digits, and underscores only."
+                  : "Lowercase letters, digits, and underscores."}
+              </p>
+            </div>
+
+            <div className="space-y-2">
+              <Label htmlFor="flag-description">Description</Label>
+              <Input
+                id="flag-description"
+                value={description}
+                onChange={(e) => setDescription(e.target.value)}
+                placeholder="What this flag controls"
+                data-action="feature-flag-form-description"
+              />
+            </div>
+
+            <div className="flex items-center justify-between rounded-md border px-3 py-2">
+              <div>
+                <div className="text-sm font-medium">Enabled by default</div>
+                <div className="text-xs text-muted-foreground">
+                  Tenants inherit this unless they override it.
+                </div>
+              </div>
+              <Switch
+                checked={enabledByDefault}
+                onCheckedChange={setEnabledByDefault}
+                data-action="feature-flag-form-default"
+              />
+            </div>
+          </div>
+
+          {error ? <DialogError error={error} context="save the flag" /> : null}
+
+          <DialogFooter>
+            <Button
+              type="button"
+              variant="outline"
+              onClick={onClose}
+              disabled={submitting}
+              data-action="feature-flag-form-cancel"
+            >
+              Cancel
+            </Button>
+            <Button type="submit" disabled={!canSubmit} data-action="feature-flag-form-save">
+              {submitting ? "Saving…" : isEdit ? "Save" : "Create flag"}
+            </Button>
+          </DialogFooter>
+        </form>
+      </DialogContent>
+    </Dialog>
+  )
+}
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/home.tsx b/app/routes/home.tsx
index 3d144aa..cde2153 100644
--- a/app/routes/home.tsx
+++ b/app/routes/home.tsx
@@ -11,7 +11,7 @@ import {
   Users as UsersIcon,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
 import { AlertBanner } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
@@ -37,6 +37,7 @@ import { listTenants, type Tenant } from "~/lib/arcadia/tenants"
 import { listUsers, type User } from "~/lib/arcadia/users"
 import { useRegisterContext } from "@crema/aifirst-ui/context"
 import { pageTitle } from "~/lib/page-meta"
+import { errorMessage } from "~/lib/errors"
 import { useSession } from "~/lib/session"
 
 export const meta = () => pageTitle("Overview")
@@ -56,7 +57,7 @@ export default function HomeRoute() {
 
   const [data, setData] = useState<DashboardData>(EMPTY)
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
+  const [error, setError] = useState<unknown>(null)
   const [refreshedAt, setRefreshedAt] = useState<Date | null>(null)
 
   const refresh = useCallback(async () => {
@@ -70,7 +71,7 @@ export default function HomeRoute() {
       listAuditLogs(arcadia, { limit: 10 }),
       getHealth(arcadia).catch(() => null),
     ]).catch((err) => {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load overview.")
+      setError(err)
       return [[], [], [], null] as [Tenant[], User[], AuditLog[], OverallHealth | null]
     })
     setData({ tenants, users, audit, health })
@@ -92,7 +93,7 @@ export default function HomeRoute() {
       tenants: { total: data.tenants.length, active: activeTenants },
       users: { total: data.users.length, active: activeUsers },
       audit: { recent: data.audit.length, errors: errorEvents },
-      health: data.health?.status ?? "unconfigured",
+      health: deriveOverallStatus(data.health),
     }
   }, [data])
 
@@ -129,7 +130,7 @@ export default function HomeRoute() {
 
       {error ? (
         <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-          {error}
+          {errorMessage(error, "load the overview")}
         </AlertBanner>
       ) : null}
 
@@ -408,6 +409,25 @@ function statusLabel(status: HealthStatus | string): string {
   return "Unknown"
 }
 
+/**
+ * The overall health hero must never say "Unknown" while its own Subsystems
+ * card reports everything Healthy. When the backend gives no meaningful overall
+ * status (unknown/unconfigured/missing), derive it from the subsystem probes
+ * the same card shows: any error → Down, any degraded → Degraded, otherwise
+ * Healthy if at least one subsystem reported ok.
+ */
+function deriveOverallStatus(health: OverallHealth | null): HealthStatus | string {
+  if (!health) return "unconfigured"
+  if (health.status === "ok" || health.status === "degraded" || health.status === "error") {
+    return health.status
+  }
+  const statuses = Object.values(health.subsystems ?? {}).map((s) => s?.status)
+  if (statuses.some((s) => s === "error")) return "error"
+  if (statuses.some((s) => s === "degraded")) return "degraded"
+  if (statuses.some((s) => s === "ok")) return "ok"
+  return health.status ?? "unconfigured"
+}
+
 function statusTone(status: HealthStatus | string): "default" | "ok" | "warning" | "error" {
   if (status === "ok") return "ok"
   if (status === "degraded") return "warning"
@@ -428,3 +448,5 @@ function timeAgo(iso: string): string {
   const d = Math.round(hr / 24)
   return `${d}d ago`
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/integrations.tsx b/app/routes/integrations.tsx
index d1bc374..1298947 100644
--- a/app/routes/integrations.tsx
+++ b/app/routes/integrations.tsx
@@ -14,7 +14,7 @@ import {
   Plus,
   Trash2,
 } from "lucide-react"
-import { ArcadiaError } from "@crema/arcadia-client"
+import { ArcadiaError } from "@crema/arcadia-core-client"
 
 import { AppShell } from "~/components/layout/app-shell"
 import { Badge } from "~/components/ui/badge"
@@ -630,3 +630,5 @@ function Field({
     </div>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/library.tsx b/app/routes/library.tsx
deleted file mode 100644
index dba06ee..0000000
--- a/app/routes/library.tsx
+++ /dev/null
@@ -1,205 +0,0 @@
-import { useState } from "react"
-import { BookOpen, Copy, Download, Trash2, MessagesSquare } from "lucide-react"
-
-import { AppShell } from "~/components/layout/app-shell"
-import { Button } from "~/components/ui/button"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-} from "~/components/ui/card"
-import { Input } from "~/components/ui/input"
-import { pageTitle } from "~/lib/page-meta"
-import {
-  deleteLibraryItem,
-  useLibrary,
-  type LibraryItem,
-} from "~/lib/library"
-
-export const meta = () => pageTitle("Library")
-
-export default function LibraryRoute() {
-  const items = useLibrary()
-  const [query, setQuery] = useState("")
-  const [openId, setOpenId] = useState<string | null>(null)
-
-  const filtered = items.filter((it) => {
-    if (!query.trim()) return true
-    const q = query.toLowerCase()
-    return (
-      it.title.toLowerCase().includes(q) ||
-      it.content.toLowerCase().includes(q) ||
-      it.tags.some((t) => t.toLowerCase().includes(q))
-    )
-  })
-
-  const open = items.find((x) => x.id === openId) ?? null
-
-  return (
-    <AppShell>
-      <Card>
-        <CardHeader>
-          <CardTitle>Library</CardTitle>
-          <CardDescription>
-            Saved items and templates. Save a chat from the Assistant via the
-            ⋯ menu → "Save to Library".
-          </CardDescription>
-        </CardHeader>
-        <CardContent className="flex flex-col gap-4">
-          <Input
-            data-action="library-search"
-            placeholder="Search saved items…"
-            value={query}
-            onChange={(e) => setQuery(e.target.value)}
-          />
-
-          {items.length === 0 ? (
-            <EmptyState />
-          ) : (
-            <div className="grid gap-3 md:grid-cols-[18rem_1fr]">
-              <ul className="flex max-h-[60vh] flex-col gap-1 overflow-y-auto rounded-lg border bg-card/40 p-2">
-                {filtered.length === 0 && (
-                  <li className="px-2 py-3 text-sm text-muted-foreground">
-                    No matches.
-                  </li>
-                )}
-                {filtered.map((it) => (
-                  <li key={it.id}>
-                    <button
-                      type="button"
-                      data-action={`library-open-${it.id}`}
-                      onClick={() => setOpenId(it.id)}
-                      className={
-                        "flex w-full items-start gap-2 rounded-md px-2 py-1.5 text-left transition-colors " +
-                        (openId === it.id
-                          ? "bg-accent text-accent-foreground"
-                          : "hover:bg-accent hover:text-accent-foreground")
-                      }
-                    >
-                      <span className="mt-0.5 shrink-0">
-                        {it.kind === "conversation" ? (
-                          <MessagesSquare className="size-4 text-muted-foreground" />
-                        ) : (
-                          <BookOpen className="size-4 text-muted-foreground" />
-                        )}
-                      </span>
-                      <span className="flex min-w-0 flex-col">
-                        <span className="line-clamp-1 text-sm font-medium">
-                          {it.title}
-                        </span>
-                        <span className="line-clamp-1 text-[11px] text-muted-foreground">
-                          {it.agentName ? `${it.agentName} · ` : ""}
-                          {it.messageCount
-                            ? `${it.messageCount} msg · `
-                            : ""}
-                          {new Date(it.createdAt).toLocaleDateString()}
-                        </span>
-                      </span>
-                    </button>
-                  </li>
-                ))}
-              </ul>
-
-              <div className="min-w-0">
-                {open ? <Detail item={open} /> : <PickAnItem />}
-              </div>
-            </div>
-          )}
-        </CardContent>
-      </Card>
-    </AppShell>
-  )
-}
-
-function EmptyState() {
-  return (
-    <div className="flex flex-col items-center justify-center gap-3 rounded-lg border-2 border-dashed border-muted-foreground/20 bg-muted/30 p-12 text-center">
-      <div className="flex size-12 items-center justify-center rounded-xl bg-background text-muted-foreground">
-        <BookOpen className="size-6" />
-      </div>
-      <div className="max-w-md">
-        <p className="font-medium">Library is empty</p>
-        <p className="mt-1 text-sm text-muted-foreground">
-          Save a conversation from the Assistant via the ⋯ menu →{" "}
-          <span className="font-medium">Save to Library</span>.
-        </p>
-      </div>
-    </div>
-  )
-}
-
-function PickAnItem() {
-  return (
-    <div className="flex h-full items-center justify-center rounded-lg border border-dashed border-muted-foreground/20 p-12 text-center text-sm text-muted-foreground">
-      Pick an item to view.
-    </div>
-  )
-}
-
-function Detail({ item }: { item: LibraryItem }) {
-  const copy = async () => {
-    try {
-      await navigator.clipboard.writeText(item.content)
-    } catch {
-      /* ignore */
-    }
-  }
-  const download = () => {
-    const blob = new Blob([item.content], {
-      type: "text/markdown;charset=utf-8",
-    })
-    const url = URL.createObjectURL(blob)
-    const a = document.createElement("a")
-    a.href = url
-    const slug = item.title.toLowerCase().replace(/[^a-z0-9]+/g, "-").slice(0, 60) || "item"
-    a.download = `${slug}.md`
-    a.click()
-    URL.revokeObjectURL(url)
-  }
-  const remove = () => {
-    if (window.confirm(`Delete "${item.title}"?`)) deleteLibraryItem(item.id)
-  }
-  return (
-    <div className="flex max-h-[60vh] flex-col rounded-lg border bg-card/40">
-      <div className="flex items-start gap-2 border-b px-3 py-2">
-        <div className="flex flex-1 flex-col">
-          <span className="font-medium">{item.title}</span>
-          <span className="text-xs text-muted-foreground">
-            {item.agentName ? `${item.agentName} · ` : ""}
-            {item.messageCount ? `${item.messageCount} msg · ` : ""}
-            {new Date(item.createdAt).toLocaleString()}
-          </span>
-        </div>
-        <Button
-          data-action={`library-copy-${item.id}`}
-          variant="ghost"
-          size="sm"
-          onClick={copy}
-        >
-          <Copy className="size-3.5" /> Copy
-        </Button>
-        <Button
-          data-action={`library-download-${item.id}`}
-          variant="ghost"
-          size="sm"
-          onClick={download}
-        >
-          <Download className="size-3.5" /> Download
-        </Button>
-        <Button
-          data-action={`library-delete-${item.id}`}
-          variant="ghost"
-          size="sm"
-          onClick={remove}
-        >
-          <Trash2 className="size-3.5 text-destructive" />
-        </Button>
-      </div>
-      <pre className="flex-1 overflow-auto whitespace-pre-wrap p-4 font-mono text-xs leading-relaxed">
-        {item.content}
-      </pre>
-    </div>
-  )
-}
diff --git a/app/routes/login.tsx b/app/routes/login.tsx
index 301db91..96bad18 100644
--- a/app/routes/login.tsx
+++ b/app/routes/login.tsx
@@ -21,12 +21,20 @@ export default function LoginRoute() {
     if (session) navigate(next, { replace: true })
   }, [session, next, navigate])
 
+  // This is an operator console: don't advertise dev seed credentials or a
+  // self-serve "Sign up" path in production. Both are dev conveniences.
+  const isDev = import.meta.env.DEV
+
   return (
     <AuthShell>
       <LoginForm
         brand={<AuthBrand />}
         heading={`Sign in to ${brand.name}`}
-        subhead="Use your arcadia credentials. In dev seeds: admin@example.com / AdminP@ssw0rd."
+        subhead={
+          isDev
+            ? "Use your arcadia credentials. In dev seeds: admin@example.com / AdminP@ssw0rd."
+            : "Use your arcadia credentials."
+        }
         onSuccess={async ({ tokens, user, twoFactorRequired, twoFactorChallenge }) => {
           if (twoFactorRequired && twoFactorChallenge) {
             navigate(
@@ -38,7 +46,7 @@ export default function LoginRoute() {
           navigate(next, { replace: true })
         }}
         onForgotPassword={() => navigate("/login/forgot")}
-        onSignup={() => navigate("/signup")}
+        onSignup={isDev ? () => navigate("/signup") : undefined}
       />
     </AuthShell>
   )
diff --git a/app/routes/memberships.tsx b/app/routes/memberships.tsx
index 414aa5d..193cab2 100644
--- a/app/routes/memberships.tsx
+++ b/app/routes/memberships.tsx
@@ -9,7 +9,8 @@ import {
   Trash2,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -22,18 +23,14 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-} from "~/components/ui/card"
+import { Card, CardContent, CardHeader } from "~/components/ui/card"
 import {
   Dialog,
   DialogContent,
@@ -42,7 +39,6 @@ import {
   DialogHeader,
   DialogTitle,
 } from "~/components/ui/dialog"
-import { Input } from "~/components/ui/input"
 import { Label } from "~/components/ui/label"
 import {
   Select,
@@ -74,16 +70,22 @@ type Editor =
   | { kind: "edit"; membership: Membership }
   | null
 
+/** Who the membership is for, in the operator's words. */
+function memberLabel(m: Membership): string {
+  return m.user?.email ?? m.user_id.slice(0, 8) + "…"
+}
+
 export default function MembershipsRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
   const [memberships, setMemberships] = useState<Membership[]>([])
   const [users, setUsers] = useState<User[]>([])
   const [roles, setRoles] = useState<Role[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // Raw thrown value — DataState turns the status code into plain language.
+  const [error, setError] = useState<unknown>(null)
   const [search, setSearch] = useState("")
   const [statusFilter, setStatusFilter] = useState<"all" | MembershipStatus>("all")
   const [editor, setEditor] = useState<Editor>(null)
@@ -93,6 +95,8 @@ export default function MembershipsRoute() {
     setError(null)
     setLoading(true)
     try {
+      // Users and roles are only needed to populate the editor's pickers; a
+      // failure there shouldn't blank the table, so they degrade to empty.
       const [m, u, r] = await Promise.all([
         listMemberships(arcadia),
         listUsers(arcadia).catch(() => [] as User[]),
@@ -102,7 +106,7 @@ export default function MembershipsRoute() {
       setUsers(u)
       setRoles(r)
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load memberships.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -207,6 +211,7 @@ export default function MembershipsRoute() {
         header: "",
         align: "right",
         cell: (m) => {
+          const who = memberLabel(m)
           const items: ActionItem[] = [
             {
               id: "edit",
@@ -223,10 +228,10 @@ export default function MembershipsRoute() {
                   onSelect: async () => {
                     try {
                       await suspendMembership(arcadia, m.id)
-                      setInfo("Membership suspended.")
                       await refresh()
+                      toast.success(`Suspended ${who}`)
                     } catch (err) {
-                      setError(err instanceof ArcadiaError ? err.message : "Suspend failed.")
+                      toast.error(errorMessage(err, `suspend ${who}`))
                     }
                   },
                 }
@@ -238,10 +243,10 @@ export default function MembershipsRoute() {
                   onSelect: async () => {
                     try {
                       await activateMembership(arcadia, m.id)
-                      setInfo("Membership activated.")
                       await refresh()
+                      toast.success(`Activated ${who}`)
                     } catch (err) {
-                      setError(err instanceof ArcadiaError ? err.message : "Activate failed.")
+                      toast.error(errorMessage(err, `activate ${who}`))
                     }
                   },
                 },
@@ -260,7 +265,7 @@ export default function MembershipsRoute() {
         },
       },
     ],
-    [arcadia, refresh],
+    [arcadia, refresh, toast],
   )
 
   const summary = useMemo(
@@ -318,17 +323,6 @@ export default function MembershipsRoute() {
           </div>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Card>
           <CardHeader className="flex flex-row items-center gap-3">
             <SearchInput
@@ -358,45 +352,46 @@ export default function MembershipsRoute() {
           </CardHeader>
 
           <CardContent className="relative p-0">
-            <LoadingOverlay
-              active={loading && memberships.length === 0}
-              label="Loading memberships…"
-            />
-            {table.total === 0 && !loading ? (
-              <EmptyState
-                icon={<Network className="size-6" />}
-                title={
-                  search || statusFilter !== "all"
-                    ? "No memberships match those filters."
-                    : "No memberships yet."
-                }
-                description={
-                  search || statusFilter !== "all"
-                    ? "Loosen the filter set."
-                    : "Add a user to a tenant to create the first membership."
-                }
-                className="py-12"
+            <DataState
+              loading={loading}
+              error={error}
+              isEmpty={table.total === 0}
+              onRetry={refresh}
+              loadingLabel="Loading memberships…"
+              empty={
+                <EmptyState
+                  icon={<Network className="size-6" />}
+                  title={
+                    search || statusFilter !== "all"
+                      ? "No memberships match those filters."
+                      : "No memberships yet."
+                  }
+                  description={
+                    search || statusFilter !== "all"
+                      ? "Loosen the filter set."
+                      : "Add a user to a tenant to create the first membership."
+                  }
+                  className="py-12"
+                />
+              }
+            >
+              <DataTable
+                columns={columns}
+                rows={table.pageRows}
+                getRowId={(m) => m.id}
+                sort={table.sort}
+                onSortToggle={table.toggleSort}
+                loading={loading && memberships.length > 0}
+                stickyHeader
               />
-            ) : (
-              <>
-                <DataTable
-                  columns={columns}
-                  rows={table.pageRows}
-                  getRowId={(m) => m.id}
-                  sort={table.sort}
-                  onSortToggle={table.toggleSort}
-                  loading={loading && memberships.length > 0}
-                  stickyHeader
-                />
-                <Pagination
-                  page={table.page}
-                  pageSize={table.pageSize}
-                  total={table.total}
-                  onPageChange={table.setPage}
-                  onPageSizeChange={table.setPageSize}
-                />
-              </>
-            )}
+              <Pagination
+                page={table.page}
+                pageSize={table.pageSize}
+                total={table.total}
+                onPageChange={table.setPage}
+                onPageSizeChange={table.setPageSize}
+              />
+            </DataState>
           </CardContent>
         </Card>
       </div>
@@ -407,21 +402,23 @@ export default function MembershipsRoute() {
         title="Remove membership?"
         description={
           pendingDelete
-            ? `${pendingDelete.user?.email ?? pendingDelete.user_id} will lose access to ${pendingDelete.tenant?.name ?? "this tenant"}.`
+            ? `${memberLabel(pendingDelete)} immediately loses access to ${pendingDelete.tenant?.name ?? "this tenant"}, along with any roles they hold there. Suspend instead if this is temporary.`
             : ""
         }
         confirmLabel="Remove"
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const who = memberLabel(pendingDelete)
+          const where = pendingDelete.tenant?.name ?? "this tenant"
           try {
             await deleteMembership(arcadia, pendingDelete.id)
             setPendingDelete(null)
-            setInfo("Membership removed.")
             await refresh()
+            toast.success(`Removed ${who} from ${where}`)
           } catch (err) {
-            setError(err instanceof ArcadiaError ? err.message : "Remove failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `remove ${who} from ${where}`))
           }
         }}
       />
@@ -432,12 +429,11 @@ export default function MembershipsRoute() {
         roles={roles}
         existingUserIds={new Set(memberships.map((m) => m.user_id))}
         onClose={() => setEditor(null)}
-        onSaved={async (msg) => {
+        onSaved={async (message) => {
           setEditor(null)
-          if (msg) setInfo(msg)
           await refresh()
+          toast.success(message)
         }}
-        onError={setError}
       />
     </AppShell>
   )
@@ -456,15 +452,13 @@ function MembershipEditorDialog({
   existingUserIds,
   onClose,
   onSaved,
-  onError,
 }: {
   state: Editor
   users: User[]
   roles: Role[]
   existingUserIds: Set<string>
   onClose: () => void
-  onSaved: (msg?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (message: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
@@ -475,9 +469,13 @@ function MembershipEditorDialog({
   const [status, setStatus] = useState<MembershipStatus>("active")
   const [selectedRoles, setSelectedRoles] = useState<Set<string>>(new Set())
   const [saving, setSaving] = useState(false)
+  // Rendered inside the dialog: a page banner would sit behind the scrim.
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!open) return
+    setError(null)
+    setSaving(false)
     if (initial) {
       setUserId(initial.user_id)
       setStatus(initial.status)
@@ -495,7 +493,7 @@ function MembershipEditorDialog({
   )
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       const input = {
@@ -503,22 +501,18 @@ function MembershipEditorDialog({
         status,
         role_ids: Array.from(selectedRoles),
       }
+      const who =
+        users.find((u) => u.id === userId)?.email ?? initial?.user?.email ?? "the member"
       if (isEdit && initial) {
         await updateMembership(arcadia, initial.id, input)
-        await onSaved("Membership updated.")
+        await onSaved(`Saved ${who}'s membership`)
       } else {
         await createMembership(arcadia, input)
-        await onSaved("Member added.")
+        await onSaved(`Added ${who}`)
       }
     } catch (err) {
-      onError(
-        err instanceof ArcadiaError
-          ? err.message
-          : err instanceof Error
-            ? err.message
-            : "Save failed.",
-      )
-    } finally {
+      // Form state survives so the operator can fix and resubmit.
+      setError(err)
       setSaving(false)
     }
   }
@@ -614,8 +608,20 @@ function MembershipEditorDialog({
           </div>
         </div>
 
+        {error ? (
+          <DialogError
+            error={error}
+            context={isEdit ? "save the membership" : "add the member"}
+          />
+        ) : null}
+
         <DialogFooter>
-          <Button variant="outline" onClick={onClose} disabled={saving}>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            disabled={saving}
+            data-action="membership-form-cancel"
+          >
             Cancel
           </Button>
           <Button
@@ -640,8 +646,4 @@ function countBy<T>(arr: T[], key: (x: T) => string): Record<string, number> {
   }, {})
 }
 
-// File-local alias just to keep the Editor type narrowable inside the dialog.
-type Editor =
-  | { kind: "create" }
-  | { kind: "edit"; membership: Membership }
-  | null
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/monitoring.tsx b/app/routes/monitoring.tsx
index 43bf544..1c70c25 100644
--- a/app/routes/monitoring.tsx
+++ b/app/routes/monitoring.tsx
@@ -14,7 +14,7 @@ import {
   Zap,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-core-client"
 import { AlertBanner } from "@crema/feedback-ui"
 import {
   BarChart,
@@ -334,7 +334,15 @@ export default function MonitoringRoute() {
             />
             <KpiTile
               label="Disk (busiest mount)"
-              value={busiestDiskLabel(data.host.disks)}
+              // The percentage alone is the metric — keep it in `value` so it
+              // never clips. The mount path (which can be long) goes in the
+              // caption, truncated with the full path on hover.
+              value={busiestDiskValue(data.host.disks)}
+              caption={
+                <span className="block truncate" title={busiestDiskMount(data.host.disks)}>
+                  {busiestDiskMount(data.host.disks)}
+                </span>
+              }
               icon={<Database className="size-4" />}
               tone={
                 busiestDiskPct(data.host.disks) > 90
@@ -691,10 +699,18 @@ function busiestDiskPct(disks: HostStats["disks"]): number {
   return disks.reduce((m, d) => Math.max(m, d.used_pct), 0)
 }
 
-function busiestDiskLabel(disks: HostStats["disks"]): string {
-  if (disks.length === 0) return "—"
-  const busiest = disks.reduce((a, b) => (b.used_pct > a.used_pct ? b : a))
-  return `${busiest.used_pct}% (${busiest.mount})`
+function busiestDisk(disks: HostStats["disks"]) {
+  if (disks.length === 0) return null
+  return disks.reduce((a, b) => (b.used_pct > a.used_pct ? b : a))
+}
+
+function busiestDiskValue(disks: HostStats["disks"]): string {
+  const d = busiestDisk(disks)
+  return d ? `${d.used_pct}%` : "—"
+}
+
+function busiestDiskMount(disks: HostStats["disks"]): string {
+  return busiestDisk(disks)?.mount ?? "no mounts"
 }
 
 function barColor(pct: number): string {
@@ -1210,3 +1226,5 @@ function severityColor(s: string): string {
   if (s === "warning") return "#f59e0b"
   return "#94a3b8"
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/networking.tsx b/app/routes/networking.tsx
index 5b85014..a09dea5 100644
--- a/app/routes/networking.tsx
+++ b/app/routes/networking.tsx
@@ -10,10 +10,13 @@ import {
   Wifi,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
 import {
@@ -77,30 +80,59 @@ export default function NetworkingRoute() {
   const [floatingIps, setFloatingIps] = useState<FloatingIp[]>([])
   const [droplets, setDroplets] = useState<Droplet[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // One error per tab. These endpoints legitimately 503 when DigitalOcean isn't
+  // configured on a deployment — which must read as "arcadia hit a server
+  // error", never as the flat lie "No firewalls." A single Promise.all also
+  // used to mean one 503 wiped all four tabs; allSettled keeps them apart.
+  const [firewallsError, setFirewallsError] = useState<unknown>(null)
+  const [vpcsError, setVpcsError] = useState<unknown>(null)
+  const [domainsError, setDomainsError] = useState<unknown>(null)
+  const [floatingIpsError, setFloatingIpsError] = useState<unknown>(null)
 
   const refresh = useCallback(async () => {
-    setError(null)
     setLoading(true)
-    try {
-      const [f, v, d, fi, dr] = await Promise.all([
-        listFirewalls(arcadia),
-        listVpcs(arcadia),
-        listDomains(arcadia),
-        listFloatingIps(arcadia),
-        listDroplets(arcadia),
-      ])
-      setFirewalls(f)
-      setVpcs(v)
-      setDomains(d)
-      setFloatingIps(fi)
-      setDroplets(dr)
-    } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load networking.")
-    } finally {
-      setLoading(false)
+    setFirewallsError(null)
+    setVpcsError(null)
+    setDomainsError(null)
+    setFloatingIpsError(null)
+
+    const [f, v, d, fi, dr] = await Promise.allSettled([
+      listFirewalls(arcadia),
+      listVpcs(arcadia),
+      listDomains(arcadia),
+      listFloatingIps(arcadia),
+      listDroplets(arcadia),
+    ])
+
+    if (f.status === "fulfilled") setFirewalls(f.value)
+    else {
+      setFirewalls([])
+      setFirewallsError(f.reason)
     }
+
+    if (v.status === "fulfilled") setVpcs(v.value)
+    else {
+      setVpcs([])
+      setVpcsError(v.reason)
+    }
+
+    if (d.status === "fulfilled") setDomains(d.value)
+    else {
+      setDomains([])
+      setDomainsError(d.reason)
+    }
+
+    if (fi.status === "fulfilled") setFloatingIps(fi.value)
+    else {
+      setFloatingIps([])
+      setFloatingIpsError(fi.reason)
+    }
+
+    // Droplets only populate the "assign to" picker; the picker already says
+    // "No droplets" when it's empty, so a failure needs no error surface here.
+    setDroplets(dr.status === "fulfilled" ? dr.value : [])
+
+    setLoading(false)
   }, [arcadia])
 
   useEffect(() => {
@@ -137,17 +169,6 @@ export default function NetworkingRoute() {
           </Button>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Tabs defaultValue="firewalls">
           <TabsList>
             <TabsTrigger value="firewalls" data-action="networking-tab-firewalls">
@@ -168,22 +189,25 @@ export default function NetworkingRoute() {
             <FirewallsPanel
               firewalls={firewalls}
               loading={loading}
+              error={firewallsError}
               onChanged={refresh}
-              onError={setError}
-              onInfo={setInfo}
             />
           </TabsContent>
 
           <TabsContent value="vpcs" className="pt-4">
-            <VpcsPanel vpcs={vpcs} loading={loading} />
+            <VpcsPanel
+              vpcs={vpcs}
+              loading={loading}
+              error={vpcsError}
+              onRetry={refresh}
+            />
           </TabsContent>
 
           <TabsContent value="domains" className="pt-4">
             <DomainsPanel
               domains={domains}
               loading={loading}
-              onError={setError}
-              onInfo={setInfo}
+              error={domainsError}
               onChanged={refresh}
             />
           </TabsContent>
@@ -193,9 +217,8 @@ export default function NetworkingRoute() {
               ips={floatingIps}
               droplets={droplets}
               loading={loading}
+              error={floatingIpsError}
               onChanged={refresh}
-              onError={setError}
-              onInfo={setInfo}
             />
           </TabsContent>
         </Tabs>
@@ -209,48 +232,41 @@ export default function NetworkingRoute() {
 function FirewallsPanel({
   firewalls,
   loading,
+  error,
   onChanged,
-  onError,
-  onInfo,
 }: {
   firewalls: Firewall[]
   loading: boolean
+  error: unknown
   onChanged: () => Promise<void>
-  onError: (msg: string | null) => void
-  onInfo: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const [pendingDelete, setPendingDelete] = useState<Firewall | null>(null)
 
-  if (loading && firewalls.length === 0) {
-    return (
-      <Card>
-        <CardContent className="relative py-8">
-          <LoadingOverlay active label="Loading firewalls…" />
-        </CardContent>
-      </Card>
-    )
-  }
-
-  if (firewalls.length === 0) {
-    return (
-      <Card>
-        <CardContent>
-          <EmptyState
-            icon={<Shield className="size-6" />}
-            title="No firewalls."
-            description="Create a firewall on your provider, or configure DigitalOcean access in arcadia's .env to see existing ones."
-            className="py-8"
-          />
-        </CardContent>
-      </Card>
-    )
-  }
-
   return (
     <>
-      <ul className="grid grid-cols-1 gap-3 lg:grid-cols-2">
-        {firewalls.map((f) => (
+      <DataState
+        loading={loading}
+        error={error}
+        isEmpty={firewalls.length === 0}
+        onRetry={onChanged}
+        loadingLabel="Loading firewalls…"
+        empty={
+          <Card>
+            <CardContent>
+              <EmptyState
+                icon={<Shield className="size-6" />}
+                title="No firewalls."
+                description="Create a firewall on your provider, or configure DigitalOcean access in arcadia's .env to see existing ones."
+                className="py-8"
+              />
+            </CardContent>
+          </Card>
+        }
+      >
+        <ul className="grid grid-cols-1 gap-3 lg:grid-cols-2">
+          {firewalls.map((f) => (
           <Card key={String(f.id)}>
             <CardHeader className="flex flex-row items-center justify-between gap-3">
               <div className="flex items-center gap-2">
@@ -273,8 +289,9 @@ function FirewallsPanel({
               {f.droplet_ids?.length ?? 0}
             </CardContent>
           </Card>
-        ))}
-      </ul>
+          ))}
+        </ul>
+      </DataState>
 
       <ConfirmDialog
         open={pendingDelete !== null}
@@ -289,14 +306,15 @@ function FirewallsPanel({
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const name = pendingDelete.name
           try {
             await deleteFirewall(arcadia, pendingDelete.id)
             setPendingDelete(null)
-            onInfo("Firewall deleted.")
             await onChanged()
+            toast.success(`Deleted firewall ${name}`)
           } catch (err) {
-            onError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete firewall ${name}`))
           }
         }}
       />
@@ -306,52 +324,59 @@ function FirewallsPanel({
 
 // --- VPCs panel --------------------------------------------------------
 
-function VpcsPanel({ vpcs, loading }: { vpcs: Vpc[]; loading: boolean }) {
-  if (loading && vpcs.length === 0) {
-    return (
-      <Card>
-        <CardContent className="relative py-8">
-          <LoadingOverlay active label="Loading VPCs…" />
-        </CardContent>
-      </Card>
-    )
-  }
-  if (vpcs.length === 0) {
-    return (
-      <Card>
-        <CardContent>
-          <EmptyState
-            icon={<Network className="size-6" />}
-            title="No VPCs."
-            description="Read-only view; create VPCs on your provider directly."
-            className="py-8"
-          />
-        </CardContent>
-      </Card>
-    )
-  }
+function VpcsPanel({
+  vpcs,
+  loading,
+  error,
+  onRetry,
+}: {
+  vpcs: Vpc[]
+  loading: boolean
+  error: unknown
+  onRetry: () => void
+}) {
   return (
-    <ul className="grid grid-cols-1 gap-3 lg:grid-cols-2">
-      {vpcs.map((v) => (
-        <Card key={v.id}>
-          <CardHeader className="flex flex-row items-center justify-between">
-            <div className="flex items-center gap-2">
-              <Network className="size-4 text-muted-foreground" />
-              <CardTitle className="text-base">{v.name}</CardTitle>
-              {v.default ? <Badge>default</Badge> : null}
-            </div>
-          </CardHeader>
-          <CardContent className="text-xs text-muted-foreground">
-            <div>
-              Region: <code className="font-mono">{v.region ?? "—"}</code>
-            </div>
-            <div>
-              IP range: <code className="font-mono">{v.ip_range ?? "—"}</code>
-            </div>
+    <DataState
+      loading={loading}
+      error={error}
+      isEmpty={vpcs.length === 0}
+      onRetry={onRetry}
+      loadingLabel="Loading VPCs…"
+      empty={
+        <Card>
+          <CardContent>
+            <EmptyState
+              icon={<Network className="size-6" />}
+              title="No VPCs."
+              description="Read-only view; create VPCs on your provider directly."
+              className="py-8"
+            />
           </CardContent>
         </Card>
-      ))}
-    </ul>
+      }
+    >
+      <ul className="grid grid-cols-1 gap-3 lg:grid-cols-2">
+        {vpcs.map((v) => (
+          <Card key={v.id}>
+            <CardHeader className="flex flex-row items-center justify-between">
+              <div className="flex items-center gap-2">
+                <Network className="size-4 text-muted-foreground" />
+                <CardTitle className="text-base">{v.name}</CardTitle>
+                {v.default ? <Badge>default</Badge> : null}
+              </div>
+            </CardHeader>
+            <CardContent className="text-xs text-muted-foreground">
+              <div>
+                Region: <code className="font-mono">{v.region ?? "—"}</code>
+              </div>
+              <div>
+                IP range: <code className="font-mono">{v.ip_range ?? "—"}</code>
+              </div>
+            </CardContent>
+          </Card>
+        ))}
+      </ul>
+    </DataState>
   )
 }
 
@@ -360,20 +385,22 @@ function VpcsPanel({ vpcs, loading }: { vpcs: Vpc[]; loading: boolean }) {
 function DomainsPanel({
   domains,
   loading,
-  onError,
-  onInfo,
+  error,
   onChanged,
 }: {
   domains: Domain[]
   loading: boolean
-  onError: (msg: string | null) => void
-  onInfo: (msg: string | null) => void
+  error: unknown
   onChanged: () => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const [selectedName, setSelectedName] = useState<string>(() => domains[0]?.name ?? "")
   const [records, setRecords] = useState<DnsRecord[]>([])
   const [loadingRecords, setLoadingRecords] = useState(false)
+  // The record list loads separately from the domain list, so it carries its
+  // own error: a 500 on records must not claim the domain has no records.
+  const [recordsError, setRecordsError] = useState<unknown>(null)
   const [createOpen, setCreateOpen] = useState(false)
   const [pendingDelete, setPendingDelete] = useState<DnsRecord | null>(null)
 
@@ -387,44 +414,47 @@ function DomainsPanel({
         setRecords([])
         return
       }
+      setRecordsError(null)
       setLoadingRecords(true)
       try {
         setRecords(await listDnsRecords(arcadia, name))
       } catch (err) {
-        onError(err instanceof ArcadiaError ? err.message : "Failed to load DNS records.")
+        setRecords([])
+        setRecordsError(err)
       } finally {
         setLoadingRecords(false)
       }
     },
-    [arcadia, onError],
+    [arcadia],
   )
 
   useEffect(() => {
     loadRecords(selectedName)
   }, [selectedName, loadRecords])
 
-  if (loading && domains.length === 0) {
+  if (loading || error || domains.length === 0) {
     return (
-      <Card>
-        <CardContent className="relative py-8">
-          <LoadingOverlay active label="Loading domains…" />
-        </CardContent>
-      </Card>
-    )
-  }
-
-  if (domains.length === 0) {
-    return (
-      <Card>
-        <CardContent>
-          <EmptyState
-            icon={<Globe className="size-6" />}
-            title="No domains."
-            description="Add a domain on your provider; arcadia surfaces it here for record management."
-            className="py-8"
-          />
-        </CardContent>
-      </Card>
+      <DataState
+        loading={loading}
+        error={error}
+        isEmpty={domains.length === 0}
+        onRetry={onChanged}
+        loadingLabel="Loading domains…"
+        empty={
+          <Card>
+            <CardContent>
+              <EmptyState
+                icon={<Globe className="size-6" />}
+                title="No domains."
+                description="Add a domain on your provider; arcadia surfaces it here for record management."
+                className="py-8"
+              />
+            </CardContent>
+          </Card>
+        }
+      >
+        {null}
+      </DataState>
     )
   }
 
@@ -470,14 +500,21 @@ function DomainsPanel({
           </Button>
         </div>
       </CardHeader>
-      <CardContent className="p-0">
-        {records.length === 0 && !loadingRecords ? (
-          <EmptyState
-            icon={<Globe className="size-6" />}
-            title="No records on this domain."
-            className="py-8"
-          />
-        ) : (
+      <CardContent className="relative p-0">
+        <DataState
+          loading={loadingRecords}
+          error={recordsError}
+          isEmpty={records.length === 0}
+          onRetry={() => loadRecords(selectedName)}
+          loadingLabel="Loading DNS records…"
+          empty={
+            <EmptyState
+              icon={<Globe className="size-6" />}
+              title="No records on this domain."
+              className="py-8"
+            />
+          }
+        >
           <ul className="divide-y border-y">
             {records.map((r) => (
               <li key={String(r.id)} className="flex items-center justify-between gap-3 px-3 py-2 text-sm">
@@ -505,20 +542,19 @@ function DomainsPanel({
               </li>
             ))}
           </ul>
-        )}
+        </DataState>
       </CardContent>
 
       <DnsCreateDialog
         open={createOpen}
         domainName={selectedName}
         onClose={() => setCreateOpen(false)}
-        onCreated={async () => {
+        onCreated={async (label) => {
           setCreateOpen(false)
-          onInfo("DNS record created.")
           await loadRecords(selectedName)
           await onChanged()
+          toast.success(`Created ${label}`)
         }}
-        onError={onError}
       />
 
       <ConfirmDialog
@@ -534,14 +570,15 @@ function DomainsPanel({
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const label = `${pendingDelete.type} ${pendingDelete.name}`
           try {
             await deleteDnsRecord(arcadia, selectedName, pendingDelete.id)
             setPendingDelete(null)
-            onInfo("Record deleted.")
             await loadRecords(selectedName)
+            toast.success(`Deleted ${label}`)
           } catch (err) {
-            onError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete ${label}`))
           }
         }}
       />
@@ -554,13 +591,11 @@ function DnsCreateDialog({
   domainName,
   onClose,
   onCreated,
-  onError,
 }: {
   open: boolean
   domainName: string
   onClose: () => void
-  onCreated: () => Promise<void>
-  onError: (msg: string | null) => void
+  onCreated: (label: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const [type, setType] = useState("A")
@@ -569,6 +604,7 @@ function DnsCreateDialog({
   const [ttl, setTtl] = useState("3600")
   const [priority, setPriority] = useState("")
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!open) {
@@ -577,11 +613,12 @@ function DnsCreateDialog({
       setData("")
       setTtl("3600")
       setPriority("")
+      setError(null)
     }
   }, [open])
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       await createDnsRecord(arcadia, domainName, {
@@ -591,9 +628,10 @@ function DnsCreateDialog({
         ttl: ttl ? Number(ttl) : undefined,
         priority: priority ? Number(priority) : undefined,
       })
-      await onCreated()
+      await onCreated(`${type} ${name} → ${data}`)
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Create failed.")
+      // A rejected record (bad target, duplicate name) is fixable right here.
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -679,8 +717,15 @@ function DnsCreateDialog({
           ) : null}
         </div>
 
+        {error ? <DialogError error={error} context="create the record" /> : null}
+
         <DialogFooter>
-          <Button variant="outline" onClick={onClose} disabled={saving}>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            disabled={saving}
+            data-action="dns-form-cancel"
+          >
             Cancel
           </Button>
           <Button onClick={submit} disabled={saving || !data} data-action="dns-form-save">
@@ -699,47 +744,37 @@ function FloatingIpsPanel({
   ips,
   droplets,
   loading,
+  error,
   onChanged,
-  onError,
-  onInfo,
 }: {
   ips: FloatingIp[]
   droplets: Droplet[]
   loading: boolean
+  error: unknown
   onChanged: () => Promise<void>
-  onError: (msg: string | null) => void
-  onInfo: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const [assigning, setAssigning] = useState<{ ip: string; dropletId: string } | null>(null)
 
-  if (loading && ips.length === 0) {
-    return (
-      <Card>
-        <CardContent className="relative py-8">
-          <LoadingOverlay active label="Loading floating IPs…" />
-        </CardContent>
-      </Card>
-    )
-  }
-  if (ips.length === 0) {
-    return (
-      <Card>
-        <CardContent>
-          <EmptyState
-            icon={<Wifi className="size-6" />}
-            title="No floating IPs."
-            description="Reserve a floating IP on your provider to surface it here."
-            className="py-8"
-          />
-        </CardContent>
-      </Card>
-    )
-  }
-
   return (
     <Card>
-      <CardContent className="p-0">
+      <CardContent className="relative p-0">
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={ips.length === 0}
+          onRetry={onChanged}
+          loadingLabel="Loading floating IPs…"
+          empty={
+            <EmptyState
+              icon={<Wifi className="size-6" />}
+              title="No floating IPs."
+              description="Reserve a floating IP on your provider to surface it here."
+              className="py-8"
+            />
+          }
+        >
         <ul className="divide-y border-y">
           {ips.map((ip) => {
             const region =
@@ -764,12 +799,10 @@ function FloatingIpsPanel({
                       onClick={async () => {
                         try {
                           await unassignFloatingIp(arcadia, ip.ip)
-                          onInfo("Floating IP unassigned.")
                           await onChanged()
+                          toast.success(`Unassigned ${ip.ip}`)
                         } catch (err) {
-                          onError(
-                            err instanceof ArcadiaError ? err.message : "Unassign failed.",
-                          )
+                          toast.error(errorMessage(err, `unassign ${ip.ip}`))
                         }
                       }}
                       data-action={`fip-${ip.ip}-unassign`}
@@ -809,14 +842,17 @@ function FloatingIpsPanel({
                         }
                         onClick={async () => {
                           if (!assigning || assigning.ip !== ip.ip) return
+                          const dropletName =
+                            droplets.find((d) => String(d.id) === assigning.dropletId)
+                              ?.name ?? assigning.dropletId
                           try {
                             await assignFloatingIp(arcadia, ip.ip, assigning.dropletId)
                             setAssigning(null)
-                            onInfo("Floating IP assigned.")
                             await onChanged()
+                            toast.success(`Assigned ${ip.ip} to ${dropletName}`)
                           } catch (err) {
-                            onError(
-                              err instanceof ArcadiaError ? err.message : "Assign failed.",
+                            toast.error(
+                              errorMessage(err, `assign ${ip.ip} to ${dropletName}`),
                             )
                           }
                         }}
@@ -831,7 +867,10 @@ function FloatingIpsPanel({
             )
           })}
         </ul>
+        </DataState>
       </CardContent>
     </Card>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/organizations.tsx b/app/routes/organizations.tsx
index 19b1b1f..b1dd61c 100644
--- a/app/routes/organizations.tsx
+++ b/app/routes/organizations.tsx
@@ -11,7 +11,8 @@ import {
   Users as UsersIcon,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -24,18 +25,14 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-} from "~/components/ui/card"
+import { Card, CardContent, CardHeader } from "~/components/ui/card"
 import {
   Dialog,
   DialogContent,
@@ -82,14 +79,20 @@ const ON_OWNER_REMOVAL_LABEL: Record<OnOwnerRemoval, string> = {
   freeze_until_new_owner: "Freeze until new owner",
 }
 
+/** Members are keyed by user_id only; show the short form consistently. */
+function memberLabel(m: OrgMembership): string {
+  return `${m.user_id.slice(0, 8)}…`
+}
+
 export default function OrganizationsRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
   const [orgs, setOrgs] = useState<Organization[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // Raw thrown value: the status code is what makes the message useful.
+  const [error, setError] = useState<unknown>(null)
   const [search, setSearch] = useState("")
   const [statusFilter, setStatusFilter] = useState<"all" | OrgStatus>("all")
 
@@ -102,7 +105,7 @@ export default function OrganizationsRoute() {
     try {
       setOrgs(await listAllOrganizations(arcadia))
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load organizations.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -179,7 +182,7 @@ export default function OrganizationsRoute() {
               onSelect: () => setSettingsDialog({ org: o }),
             },
           ]
-          return <ActionsCell items={items} />
+          return <ActionsCell items={items} triggerDataAction={`org-${o.id}-actions`} />
         },
       },
     ],
@@ -222,17 +225,6 @@ export default function OrganizationsRoute() {
           </div>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Card>
           <CardHeader className="flex flex-row items-center gap-3">
             <SearchInput
@@ -262,64 +254,59 @@ export default function OrganizationsRoute() {
           </CardHeader>
 
           <CardContent className="relative p-0">
-            <LoadingOverlay
-              active={loading && orgs.length === 0}
-              label="Loading organizations…"
-            />
-            {table.total === 0 && !loading ? (
-              <EmptyState
-                icon={<Building className="size-6" />}
-                title={
-                  search || statusFilter !== "all"
-                    ? "No organizations match those filters."
-                    : "No organizations yet."
-                }
-                description={
-                  search || statusFilter !== "all"
-                    ? "Loosen the filter set."
-                    : "End-users create these from inside the app; nothing to do here yet."
-                }
-                className="py-12"
+            <DataState
+              loading={loading}
+              error={error}
+              isEmpty={table.total === 0}
+              onRetry={refresh}
+              loadingLabel="Loading organizations…"
+              empty={
+                <EmptyState
+                  icon={<Building className="size-6" />}
+                  title={
+                    search || statusFilter !== "all"
+                      ? "No organizations match those filters."
+                      : "No organizations yet."
+                  }
+                  description={
+                    search || statusFilter !== "all"
+                      ? "Loosen the filter set."
+                      : "End-users create these from inside the app; nothing to do here yet."
+                  }
+                  className="py-12"
+                />
+              }
+            >
+              <DataTable
+                columns={columns}
+                rows={table.pageRows}
+                getRowId={(o) => o.id}
+                sort={table.sort}
+                onSortToggle={table.toggleSort}
+                loading={loading && orgs.length > 0}
+                stickyHeader
               />
-            ) : (
-              <>
-                <DataTable
-                  columns={columns}
-                  rows={table.pageRows}
-                  getRowId={(o) => o.id}
-                  sort={table.sort}
-                  onSortToggle={table.toggleSort}
-                  loading={loading && orgs.length > 0}
-                  stickyHeader
-                />
-                <Pagination
-                  page={table.page}
-                  pageSize={table.pageSize}
-                  total={table.total}
-                  onPageChange={table.setPage}
-                  onPageSizeChange={table.setPageSize}
-                />
-              </>
-            )}
+              <Pagination
+                page={table.page}
+                pageSize={table.pageSize}
+                total={table.total}
+                onPageChange={table.setPage}
+                onPageSizeChange={table.setPageSize}
+              />
+            </DataState>
           </CardContent>
         </Card>
       </div>
 
-      <MembersDialog
-        state={membersDialog}
-        onClose={() => setMembersDialog(null)}
-        onInfo={setInfo}
-        onError={setError}
-      />
+      <MembersDialog state={membersDialog} onClose={() => setMembersDialog(null)} />
       <SettingsDialog
         state={settingsDialog}
         onClose={() => setSettingsDialog(null)}
-        onSaved={async (msg) => {
+        onSaved={async (message) => {
           setSettingsDialog(null)
-          if (msg) setInfo(msg)
           await refresh()
+          toast.success(message)
         }}
-        onError={setError}
       />
     </AppShell>
   )
@@ -347,38 +334,42 @@ type InvitePane = "none" | "invite_existing" | "add_restricted"
 function MembersDialog({
   state,
   onClose,
-  onInfo,
-  onError,
 }: {
   state: MembersDialogState
   onClose: () => void
-  onInfo: (msg: string | null) => void
-  onError: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const open = state !== null
   const org = state?.org
 
   const [members, setMembers] = useState<OrgMembership[]>([])
   const [loading, setLoading] = useState(false)
+  // The member list has its own load error — a failed fetch inside this dialog
+  // must not read as "no members yet".
+  const [error, setError] = useState<unknown>(null)
   const [pendingRemove, setPendingRemove] = useState<OrgMembership | null>(null)
   const [transferTarget, setTransferTarget] = useState<OrgMembership | null>(null)
   const [pane, setPane] = useState<InvitePane>("none")
 
   const refresh = useCallback(async () => {
     if (!org) return
+    setError(null)
     setLoading(true)
     try {
       setMembers(await listMembers(arcadia, org.id))
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Failed to load members.")
+      setError(err)
     } finally {
       setLoading(false)
     }
-  }, [arcadia, org, onError])
+  }, [arcadia, org])
 
   useEffect(() => {
-    if (open) refresh()
+    if (open) {
+      setPane("none")
+      refresh()
+    }
   }, [open, refresh])
 
   return (
@@ -417,36 +408,40 @@ function MembersDialog({
           <InviteByEmailForm
             orgId={org!.id}
             onCancel={() => setPane("none")}
-            onSaved={async (msg) => {
+            onSaved={async (message) => {
               setPane("none")
-              onInfo(msg)
               await refresh()
+              toast.success(message)
             }}
-            onError={onError}
           />
         ) : (
           <AddRestrictedForm
             orgId={org!.id}
             onCancel={() => setPane("none")}
-            onSaved={async (msg) => {
+            onSaved={async (message) => {
               setPane("none")
-              onInfo(msg)
               await refresh()
+              toast.success(message)
             }}
-            onError={onError}
           />
         )}
 
         <div className="relative">
-          <LoadingOverlay active={loading && members.length === 0} label="Loading members…" />
-          {members.length === 0 && !loading ? (
-            <EmptyState
-              icon={<UsersIcon className="size-6" />}
-              title="No members yet."
-              description="Invite someone or add a restricted sub-user to get started."
-              className="py-8"
-            />
-          ) : (
+          <DataState
+            loading={loading}
+            error={error}
+            isEmpty={members.length === 0}
+            onRetry={refresh}
+            loadingLabel="Loading members…"
+            empty={
+              <EmptyState
+                icon={<UsersIcon className="size-6" />}
+                title="No members yet."
+                description="Invite someone or add a restricted sub-user to get started."
+                className="py-8"
+              />
+            }
+          >
             <div className="rounded-md border border-border">
               <table className="w-full text-sm">
                 <thead className="bg-muted/40 text-left text-xs text-muted-foreground">
@@ -461,7 +456,7 @@ function MembersDialog({
                 <tbody>
                   {members.map((m) => (
                     <tr key={m.id} className="border-t border-border">
-                      <td className="px-3 py-2 font-mono text-xs">{m.user_id.slice(0, 8)}…</td>
+                      <td className="px-3 py-2 font-mono text-xs">{memberLabel(m)}</td>
                       <td className="px-3 py-2">
                         <Badge variant={roleBadgeVariant(m.role)}>{m.role}</Badge>
                       </td>
@@ -477,11 +472,7 @@ function MembersDialog({
                           orgId={org!.id}
                           onTransfer={() => setTransferTarget(m)}
                           onRemove={() => setPendingRemove(m)}
-                          onRoleChanged={async (msg) => {
-                            onInfo(msg)
-                            await refresh()
-                          }}
-                          onError={onError}
+                          onRoleChanged={refresh}
                         />
                       </td>
                     </tr>
@@ -489,7 +480,7 @@ function MembersDialog({
                 </tbody>
               </table>
             </div>
-          )}
+          </DataState>
         </div>
 
         <DialogFooter>
@@ -505,22 +496,25 @@ function MembersDialog({
           description={
             pendingRemove
               ? pendingRemove.role === "owner"
-                ? "This member is the owner. Removal will follow the org's owner-removal policy."
-                : "They will lose access to this organization."
+                ? `This member owns ${org?.name ?? "the organization"}. Removing them applies its owner-removal policy — ${
+                    org ? ON_OWNER_REMOVAL_LABEL[org.on_owner_removal].toLowerCase() : "the configured policy"
+                  } — which may delete or freeze the whole workspace. Transfer ownership first if you only mean to remove the person.`
+                : `They immediately lose access to ${org?.name ?? "this organization"} and anything shared inside it.`
               : ""
           }
           confirmLabel="Remove"
           variant="danger"
           onConfirm={async () => {
             if (!pendingRemove || !org) return
+            const who = memberLabel(pendingRemove)
             try {
               await removeMember(arcadia, org.id, pendingRemove.user_id)
               setPendingRemove(null)
-              onInfo("Member removed.")
               await refresh()
+              toast.success(`Removed ${who} from ${org.name}`)
             } catch (err) {
-              onError(err instanceof ArcadiaError ? err.message : "Remove failed.")
               setPendingRemove(null)
+              toast.error(errorMessage(err, `remove ${who} from ${org.name}`))
             }
           }}
         />
@@ -531,21 +525,22 @@ function MembersDialog({
           title="Transfer ownership?"
           description={
             transferTarget
-              ? `The current owner will be demoted to admin. ${transferTarget.user_id.slice(0, 8)}… will become owner.`
+              ? `${memberLabel(transferTarget)} becomes the owner of ${org?.name ?? "this organization"}, and the current owner is demoted to admin.`
               : ""
           }
           confirmLabel="Transfer"
           variant="default"
           onConfirm={async () => {
             if (!transferTarget || !org) return
+            const who = memberLabel(transferTarget)
             try {
               await transferOwnership(arcadia, org.id, transferTarget.user_id)
               setTransferTarget(null)
-              onInfo("Ownership transferred.")
               await refresh()
+              toast.success(`${org.name} is now owned by ${who}`)
             } catch (err) {
-              onError(err instanceof ArcadiaError ? err.message : "Transfer failed.")
               setTransferTarget(null)
+              toast.error(errorMessage(err, `transfer ${org.name} to ${who}`))
             }
           }}
         />
@@ -560,16 +555,15 @@ function MemberRowActions({
   onTransfer,
   onRemove,
   onRoleChanged,
-  onError,
 }: {
   member: OrgMembership
   orgId: string
   onTransfer: () => void
   onRemove: () => void
-  onRoleChanged: (msg: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onRoleChanged: () => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
   const items: ActionItem[] = []
 
@@ -583,9 +577,10 @@ function MemberRowActions({
         const next = member.role === "admin" ? "member" : "admin"
         try {
           await changeMemberRole(arcadia, orgId, member.user_id, next)
-          await onRoleChanged(`Role set to ${next}.`)
+          await onRoleChanged()
+          toast.success(`${memberLabel(member)} is now ${next === "admin" ? "an admin" : "a member"}`)
         } catch (err) {
-          onError(err instanceof ArcadiaError ? err.message : "Role change failed.")
+          toast.error(errorMessage(err, `change ${memberLabel(member)} to ${next}`))
         }
       },
     })
@@ -607,7 +602,9 @@ function MemberRowActions({
     onSelect: onRemove,
   })
 
-  return <ActionsCell items={items} />
+  return (
+    <ActionsCell items={items} triggerDataAction={`org-${orgId}-member-${member.id}-actions`} />
+  )
 }
 
 // ============================================================================
@@ -618,17 +615,33 @@ function InviteByEmailForm({
   orgId,
   onCancel,
   onSaved,
-  onError,
 }: {
   orgId: string
   onCancel: () => void
-  onSaved: (msg: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (message: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const [email, setEmail] = useState("")
   const [role, setRole] = useState<OrgRole>("member")
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
+
+  const submit = async () => {
+    setError(null)
+    setSaving(true)
+    try {
+      const res = await inviteMember(arcadia, orgId, { email, role })
+      await onSaved(
+        res.type === "membership"
+          ? `Added ${email.trim()} — they already had an account`
+          : `Invitation sent to ${email.trim()}`,
+      )
+    } catch (err) {
+      // The form stays filled in; the error lands right under it.
+      setError(err)
+      setSaving(false)
+    }
+  }
 
   return (
     <div className="rounded-md border border-border bg-muted/20 p-3">
@@ -637,9 +650,10 @@ function InviteByEmailForm({
           placeholder="email@example.com"
           value={email}
           onChange={(e) => setEmail(e.target.value)}
+          data-action={`org-${orgId}-invite-email`}
         />
         <Select value={role} onValueChange={(v) => setRole(v as OrgRole)}>
-          <SelectTrigger>
+          <SelectTrigger data-action={`org-${orgId}-invite-role`}>
             <SelectValue />
           </SelectTrigger>
           <SelectContent>
@@ -647,31 +661,31 @@ function InviteByEmailForm({
             <SelectItem value="admin">Admin</SelectItem>
           </SelectContent>
         </Select>
-        <Button variant="outline" size="sm" onClick={onCancel} disabled={saving}>
+        <Button
+          variant="outline"
+          size="sm"
+          onClick={onCancel}
+          disabled={saving}
+          data-action={`org-${orgId}-invite-cancel`}
+        >
           Cancel
         </Button>
         <Button
           size="sm"
           disabled={!email || saving}
-          onClick={async () => {
-            setSaving(true)
-            try {
-              const res = await inviteMember(arcadia, orgId, { email, role })
-              await onSaved(
-                res.type === "membership"
-                  ? "Invited existing user."
-                  : "Email invitation sent.",
-              )
-            } catch (err) {
-              onError(err instanceof ArcadiaError ? err.message : "Invite failed.")
-            } finally {
-              setSaving(false)
-            }
-          }}
+          onClick={submit}
+          data-action={`org-${orgId}-invite-submit`}
         >
           Send invite
         </Button>
       </div>
+
+      {error ? (
+        <div className="mt-2">
+          <DialogError error={error} context="send the invitation" />
+        </div>
+      ) : null}
+
       <p className="mt-2 text-xs text-muted-foreground">
         If an account with that email already exists in this tenant, an invited membership is
         created; otherwise an email invitation is sent and the user is materialized on accept.
@@ -684,12 +698,10 @@ function AddRestrictedForm({
   orgId,
   onCancel,
   onSaved,
-  onError,
 }: {
   orgId: string
   onCancel: () => void
-  onSaved: (msg: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (message: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const [email, setEmail] = useState("")
@@ -698,13 +710,37 @@ function AddRestrictedForm({
   const [password, setPassword] = useState("")
   const [role, setRole] = useState<OrgRole>("member")
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
+
+  const submit = async () => {
+    setError(null)
+    setSaving(true)
+    try {
+      await addRestrictedMember(arcadia, orgId, {
+        email,
+        password,
+        first_name: firstName,
+        last_name: lastName,
+        role,
+      })
+      await onSaved(`Added ${email.trim()} as a restricted user`)
+    } catch (err) {
+      setError(err)
+      setSaving(false)
+    }
+  }
 
   return (
     <div className="rounded-md border border-border bg-muted/20 p-3">
       <div className="grid gap-2 sm:grid-cols-2">
         <div className="flex flex-col gap-1">
           <Label htmlFor="r-email">Email</Label>
-          <Input id="r-email" value={email} onChange={(e) => setEmail(e.target.value)} />
+          <Input
+            id="r-email"
+            value={email}
+            onChange={(e) => setEmail(e.target.value)}
+            data-action={`org-${orgId}-restricted-email`}
+          />
         </div>
         <div className="flex flex-col gap-1">
           <Label htmlFor="r-password">Initial password</Label>
@@ -713,20 +749,31 @@ function AddRestrictedForm({
             type="password"
             value={password}
             onChange={(e) => setPassword(e.target.value)}
+            data-action={`org-${orgId}-restricted-password`}
           />
         </div>
         <div className="flex flex-col gap-1">
           <Label htmlFor="r-first">First name</Label>
-          <Input id="r-first" value={firstName} onChange={(e) => setFirstName(e.target.value)} />
+          <Input
+            id="r-first"
+            value={firstName}
+            onChange={(e) => setFirstName(e.target.value)}
+            data-action={`org-${orgId}-restricted-first-name`}
+          />
         </div>
         <div className="flex flex-col gap-1">
           <Label htmlFor="r-last">Last name</Label>
-          <Input id="r-last" value={lastName} onChange={(e) => setLastName(e.target.value)} />
+          <Input
+            id="r-last"
+            value={lastName}
+            onChange={(e) => setLastName(e.target.value)}
+            data-action={`org-${orgId}-restricted-last-name`}
+          />
         </div>
         <div className="flex flex-col gap-1">
           <Label htmlFor="r-role">Role</Label>
           <Select value={role} onValueChange={(v) => setRole(v as OrgRole)}>
-            <SelectTrigger id="r-role">
+            <SelectTrigger id="r-role" data-action={`org-${orgId}-restricted-role`}>
               <SelectValue />
             </SelectTrigger>
             <SelectContent>
@@ -736,30 +783,28 @@ function AddRestrictedForm({
           </Select>
         </div>
       </div>
+
+      {error ? (
+        <div className="mt-3">
+          <DialogError error={error} context="add the restricted user" />
+        </div>
+      ) : null}
+
       <div className="mt-3 flex items-center justify-end gap-2">
-        <Button variant="outline" size="sm" onClick={onCancel} disabled={saving}>
+        <Button
+          variant="outline"
+          size="sm"
+          onClick={onCancel}
+          disabled={saving}
+          data-action={`org-${orgId}-restricted-cancel`}
+        >
           Cancel
         </Button>
         <Button
           size="sm"
           disabled={!email || !password || !firstName || !lastName || saving}
-          onClick={async () => {
-            setSaving(true)
-            try {
-              await addRestrictedMember(arcadia, orgId, {
-                email,
-                password,
-                first_name: firstName,
-                last_name: lastName,
-                role,
-              })
-              await onSaved("Restricted user added.")
-            } catch (err) {
-              onError(err instanceof ArcadiaError ? err.message : "Add failed.")
-            } finally {
-              setSaving(false)
-            }
-          }}
+          onClick={submit}
+          data-action={`org-${orgId}-restricted-submit`}
         >
           Add user
         </Button>
@@ -780,12 +825,10 @@ function SettingsDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: SettingsDialogState
   onClose: () => void
-  onSaved: (msg?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (message: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
@@ -795,15 +838,35 @@ function SettingsDialog({
   const [status, setStatus] = useState<OrgStatus>("active")
   const [onOwnerRemoval, setOnOwnerRemoval] = useState<OnOwnerRemoval>("require_transfer")
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (org) {
       setName(org.name)
       setStatus(org.status)
       setOnOwnerRemoval(org.on_owner_removal)
+      setError(null)
+      setSaving(false)
     }
   }, [org])
 
+  const submit = async () => {
+    if (!org) return
+    setError(null)
+    setSaving(true)
+    try {
+      await updateOrganization(arcadia, org.id, {
+        name,
+        status,
+        on_owner_removal: onOwnerRemoval,
+      })
+      await onSaved(`Saved ${name.trim() || org.name}`)
+    } catch (err) {
+      setError(err)
+      setSaving(false)
+    }
+  }
+
   return (
     <Dialog open={open} onOpenChange={(o) => !o && onClose()}>
       <DialogContent>
@@ -815,13 +878,18 @@ function SettingsDialog({
         <div className="flex flex-col gap-3">
           <div className="flex flex-col gap-1">
             <Label htmlFor="o-name">Name</Label>
-            <Input id="o-name" value={name} onChange={(e) => setName(e.target.value)} />
+            <Input
+              id="o-name"
+              value={name}
+              onChange={(e) => setName(e.target.value)}
+              data-action="org-settings-name"
+            />
           </div>
 
           <div className="flex flex-col gap-1">
             <Label htmlFor="o-status">Status</Label>
             <Select value={status} onValueChange={(v) => setStatus(v as OrgStatus)}>
-              <SelectTrigger id="o-status">
+              <SelectTrigger id="o-status" data-action="org-settings-status">
                 <SelectValue />
               </SelectTrigger>
               <SelectContent>
@@ -838,7 +906,7 @@ function SettingsDialog({
               value={onOwnerRemoval}
               onValueChange={(v) => setOnOwnerRemoval(v as OnOwnerRemoval)}
             >
-              <SelectTrigger id="o-policy">
+              <SelectTrigger id="o-policy" data-action="org-settings-policy">
                 <SelectValue />
               </SelectTrigger>
               <SelectContent>
@@ -853,33 +921,24 @@ function SettingsDialog({
           </div>
         </div>
 
+        {error ? <DialogError error={error} context="save the organization" /> : null}
+
         <DialogFooter>
-          <Button variant="outline" onClick={onClose} disabled={saving}>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            disabled={saving}
+            data-action="org-settings-cancel"
+          >
             Cancel
           </Button>
-          <Button
-            disabled={saving}
-            onClick={async () => {
-              if (!org) return
-              setSaving(true)
-              try {
-                await updateOrganization(arcadia, org.id, {
-                  name,
-                  status,
-                  on_owner_removal: onOwnerRemoval,
-                })
-                await onSaved("Organization updated.")
-              } catch (err) {
-                onError(err instanceof ArcadiaError ? err.message : "Save failed.")
-              } finally {
-                setSaving(false)
-              }
-            }}
-          >
-            Save
+          <Button disabled={saving} onClick={submit} data-action="org-settings-save">
+            {saving ? "Saving…" : "Save"}
           </Button>
         </DialogFooter>
       </DialogContent>
     </Dialog>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/plan.tsx b/app/routes/plan.tsx
deleted file mode 100644
index d31bcfc..0000000
--- a/app/routes/plan.tsx
+++ /dev/null
@@ -1,40 +0,0 @@
-// Tenant subscription + billing — placeholder. Real surface lists the
-// active plan, renewal date, invoices, and payment method for the
-// active tenant. Data source not wired yet.
-
-import { CreditCard } from "lucide-react"
-import { AppShell } from "~/components/layout/app-shell"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-} from "~/components/ui/card"
-
-export default function PlanRoute() {
-  return (
-    <AppShell>
-      <div className="flex items-center gap-3">
-        <div className="flex size-10 items-center justify-center rounded-lg bg-primary/10 text-primary">
-          <CreditCard className="size-5" />
-        </div>
-        <div>
-          <h1 className="text-2xl font-semibold">Plan</h1>
-          <p className="text-sm text-muted-foreground">
-            Your tenant's subscription, billing details, and invoice history.
-          </p>
-        </div>
-      </div>
-      <Card>
-        <CardHeader>
-          <CardTitle>Coming soon</CardTitle>
-          <CardDescription>
-            Billing is not yet wired to a payment provider on this deployment.
-          </CardDescription>
-        </CardHeader>
-        <CardContent />
-      </Card>
-    </AppShell>
-  )
-}
diff --git a/app/routes/profile.tsx b/app/routes/profile.tsx
index 441e6b6..82908ed 100644
--- a/app/routes/profile.tsx
+++ b/app/routes/profile.tsx
@@ -1,10 +1,11 @@
 import { useCallback, useEffect, useState } from "react"
 import { Check, RefreshCw, Trash2 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-core-client"
 import { AlertBanner } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { CopyId } from "~/components/copy-id"
 import { Avatar, AvatarFallback, AvatarImage } from "~/components/ui/avatar"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
@@ -357,9 +358,11 @@ export default function ProfileRoute() {
               </span>
               {account ? (
                 <>
-                  <span className="text-xs text-muted-foreground">
-                    Tenant <code className="font-mono">{account.tenant_id}</code> ·
-                    ID <code className="font-mono">{account.id}</code>
+                  <span className="flex flex-wrap items-center gap-1.5 text-xs text-muted-foreground">
+                    Tenant
+                    <CopyId value={account.tenant_id} label="tenant id" dataAction="profile-copy-tenant-id" />
+                    · ID
+                    <CopyId value={account.id} label="account id" dataAction="profile-copy-account-id" />
                   </span>
                   <span className="text-xs text-muted-foreground">
                     Last sign-in{" "}
@@ -621,3 +624,5 @@ function Field({
     </label>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/scheduled-tasks.tsx b/app/routes/scheduled-tasks.tsx
index 83a335d..035140d 100644
--- a/app/routes/scheduled-tasks.tsx
+++ b/app/routes/scheduled-tasks.tsx
@@ -12,7 +12,8 @@ import {
   Zap,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -25,9 +26,11 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
 import {
@@ -84,11 +87,13 @@ type EditorState =
 export default function ScheduledTasksRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
   const [tasks, setTasks] = useState<ScheduledTask[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // Raw thrown value — the task list's own error. The run-history dialog keeps
+  // its own, so a failing run log never blanks the task table.
+  const [error, setError] = useState<unknown>(null)
   const [search, setSearch] = useState("")
   const [editor, setEditor] = useState<EditorState>(null)
   const [pendingDelete, setPendingDelete] = useState<ScheduledTask | null>(null)
@@ -100,7 +105,7 @@ export default function ScheduledTasksRoute() {
     try {
       setTasks(await listScheduledTasks(arcadia))
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load scheduled tasks.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -199,15 +204,14 @@ export default function ScheduledTasksRoute() {
               setEditor,
               setPendingDelete,
               setRunsFor,
-              setError,
-              setInfo,
+              toast,
             })}
             triggerDataAction={`task-${t.id}-actions`}
           />
         ),
       },
     ],
-    [arcadia, refresh],
+    [arcadia, refresh, toast],
   )
 
   const summary = useMemo(
@@ -273,17 +277,6 @@ export default function ScheduledTasksRoute() {
           </div>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Card>
           <CardHeader className="flex flex-row items-center gap-3">
             <SearchInput
@@ -299,38 +292,42 @@ export default function ScheduledTasksRoute() {
           </CardHeader>
 
           <CardContent className="relative p-0">
-            <LoadingOverlay active={loading && tasks.length === 0} label="Loading tasks…" />
-            {table.total === 0 && !loading ? (
-              <EmptyState
-                icon={<CalendarClock className="size-6" />}
-                title={search ? "No tasks match." : "No scheduled tasks yet."}
-                description={
-                  search
-                    ? "Try a different search."
-                    : "Schedule a recurring webhook or platform event."
-                }
-                className="py-12"
+            <DataState
+              loading={loading}
+              error={error}
+              isEmpty={table.total === 0}
+              onRetry={refresh}
+              loadingLabel="Loading tasks…"
+              empty={
+                <EmptyState
+                  icon={<CalendarClock className="size-6" />}
+                  title={search ? "No tasks match." : "No scheduled tasks yet."}
+                  description={
+                    search
+                      ? "Try a different search."
+                      : "Schedule a recurring webhook or platform event."
+                  }
+                  className="py-12"
+                />
+              }
+            >
+              <DataTable
+                columns={columns}
+                rows={table.pageRows}
+                getRowId={(t) => t.id}
+                sort={table.sort}
+                onSortToggle={table.toggleSort}
+                loading={loading && tasks.length > 0}
+                stickyHeader
               />
-            ) : (
-              <>
-                <DataTable
-                  columns={columns}
-                  rows={table.pageRows}
-                  getRowId={(t) => t.id}
-                  sort={table.sort}
-                  onSortToggle={table.toggleSort}
-                  loading={loading && tasks.length > 0}
-                  stickyHeader
-                />
-                <Pagination
-                  page={table.page}
-                  pageSize={table.pageSize}
-                  total={table.total}
-                  onPageChange={table.setPage}
-                  onPageSizeChange={table.setPageSize}
-                />
-              </>
-            )}
+              <Pagination
+                page={table.page}
+                pageSize={table.pageSize}
+                total={table.total}
+                onPageChange={table.setPage}
+                onPageSizeChange={table.setPageSize}
+              />
+            </DataState>
           </CardContent>
         </Card>
       </div>
@@ -348,14 +345,15 @@ export default function ScheduledTasksRoute() {
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const name = pendingDelete.name
           try {
             await deleteScheduledTask(arcadia, pendingDelete.id)
             setPendingDelete(null)
-            setInfo("Task deleted.")
             await refresh()
+            toast.success(`Deleted ${name}`)
           } catch (err) {
-            setError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete ${name}`))
           }
         }}
       />
@@ -363,14 +361,14 @@ export default function ScheduledTasksRoute() {
       <TaskEditorDialog
         state={editor}
         onClose={() => setEditor(null)}
-        onSaved={async () => {
+        onSaved={async (msg) => {
           setEditor(null)
           await refresh()
+          toast.success(msg)
         }}
-        onError={setError}
       />
 
-      <RunsDialog task={runsFor} onClose={() => setRunsFor(null)} onError={setError} />
+      <RunsDialog task={runsFor} onClose={() => setRunsFor(null)} />
     </AppShell>
   )
 }
@@ -383,11 +381,10 @@ function rowActions(
     setEditor: (s: EditorState) => void
     setPendingDelete: (t: ScheduledTask | null) => void
     setRunsFor: (t: ScheduledTask | null) => void
-    setError: (m: string | null) => void
-    setInfo: (m: string | null) => void
+    toast: ReturnType<typeof useToast>
   },
 ): ActionItem[] {
-  const { arcadia, refresh, setEditor, setPendingDelete, setRunsFor, setError, setInfo } = ctx
+  const { arcadia, refresh, setEditor, setPendingDelete, setRunsFor, toast } = ctx
   const items: ActionItem[] = []
 
   items.push({
@@ -398,10 +395,12 @@ function rowActions(
     onSelect: async () => {
       try {
         await triggerScheduledTask(arcadia, t.id)
-        setInfo(`${t.name} triggered. Check the run log for status.`)
         await refresh()
+        toast.success(`Triggered ${t.name}`, {
+          description: "Check the run log for status.",
+        })
       } catch (err) {
-        setError(err instanceof ArcadiaError ? err.message : "Trigger failed.")
+        toast.error(errorMessage(err, `trigger ${t.name}`))
       }
     },
   })
@@ -428,10 +427,10 @@ function rowActions(
       onSelect: async () => {
         try {
           await disableScheduledTask(arcadia, t.id)
-          setInfo(`${t.name} disabled.`)
           await refresh()
+          toast.success(`Disabled ${t.name}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Disable failed.")
+          toast.error(errorMessage(err, `disable ${t.name}`))
         }
       },
     })
@@ -444,10 +443,10 @@ function rowActions(
       onSelect: async () => {
         try {
           await enableScheduledTask(arcadia, t.id)
-          setInfo(`${t.name} enabled.`)
           await refresh()
+          toast.success(`Enabled ${t.name}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Enable failed.")
+          toast.error(errorMessage(err, `enable ${t.name}`))
         }
       },
     })
@@ -469,12 +468,10 @@ function TaskEditorDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: EditorState
   onClose: () => void
-  onSaved: () => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (msg: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
@@ -492,6 +489,13 @@ function TaskEditorDialog({
   const [maxRetries, setMaxRetries] = useState("3")
   const [timeoutSeconds, setTimeoutSeconds] = useState("30")
   const [saving, setSaving] = useState(false)
+  // The dialog owns its failures — including the local "config isn't valid
+  // JSON" throw, which the operator can only fix in this very textarea.
+  const [error, setError] = useState<unknown>(null)
+
+  useEffect(() => {
+    if (!open) setError(null)
+  }, [open])
 
   useEffect(() => {
     if (!open) return
@@ -523,7 +527,7 @@ function TaskEditorDialog({
   }, [open, initial])
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       let parsedConfig: Record<string, unknown>
@@ -551,17 +555,17 @@ function TaskEditorDialog({
         timeout_seconds: Math.max(1, Number(timeoutSeconds) || 30),
       }
 
-      if (isEdit && initial) await updateScheduledTask(arcadia, initial.id, input)
-      else await createScheduledTask(arcadia, input)
-      await onSaved()
+      if (isEdit && initial) {
+        await updateScheduledTask(arcadia, initial.id, input)
+        await onSaved(`Saved ${name}`)
+      } else {
+        await createScheduledTask(arcadia, input)
+        await onSaved(`Created ${name}`)
+      }
     } catch (err) {
-      onError(
-        err instanceof ArcadiaError
-          ? err.message
-          : err instanceof Error
-            ? err.message
-            : "Save failed.",
-      )
+      // Stay open with the form intact: cron and JSON config are fiddly enough
+      // that retyping them after a failure would be its own bug report.
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -701,6 +705,13 @@ function TaskEditorDialog({
           </div>
         </div>
 
+        {error ? (
+          <DialogError
+            error={error}
+            context={isEdit ? "save the task" : "create the task"}
+          />
+        ) : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} disabled={saving} data-action="task-form-cancel">
             Cancel
@@ -722,31 +733,38 @@ function TaskEditorDialog({
 function RunsDialog({
   task,
   onClose,
-  onError,
 }: {
   task: ScheduledTask | null
   onClose: () => void
-  onError: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
   const [runs, setRuns] = useState<TaskRun[]>([])
   const [loading, setLoading] = useState(true)
+  // Independent of the task list's error: a 500 on the run log must not blank
+  // the table behind this dialog, and must not read as "no runs yet".
+  const [error, setError] = useState<unknown>(null)
   const [expanded, setExpanded] = useState<string | null>(null)
 
-  useEffect(() => {
-    if (!task) return
-    let mounted = true
+  const taskId = task?.id
+
+  const load = useCallback(async () => {
+    if (!taskId) return
+    setError(null)
     setLoading(true)
-    listTaskRuns(arcadia, task.id, { limit: 50 })
-      .then((r) => mounted && setRuns(r))
-      .catch((err) =>
-        onError(err instanceof ArcadiaError ? err.message : "Failed to load runs."),
-      )
-      .finally(() => mounted && setLoading(false))
-    return () => {
-      mounted = false
+    try {
+      setRuns(await listTaskRuns(arcadia, taskId, { limit: 50 }))
+    } catch (err) {
+      setError(err)
+    } finally {
+      setLoading(false)
     }
-  }, [arcadia, task, onError])
+  }, [arcadia, taskId])
+
+  useEffect(() => {
+    if (!taskId) return
+    setRuns([])
+    load()
+  }, [taskId, load])
 
   if (!task) return null
 
@@ -760,13 +778,21 @@ function RunsDialog({
           </DialogDescription>
         </DialogHeader>
 
-        {loading ? (
-          <p className="py-6 text-center text-sm text-muted-foreground">
-            <RefreshCw className="mr-1 inline size-3.5 animate-spin" /> Loading…
-          </p>
-        ) : runs.length === 0 ? (
-          <p className="py-6 text-center text-sm text-muted-foreground">No runs yet.</p>
-        ) : (
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={runs.length === 0}
+          onRetry={load}
+          loadingLabel="Loading runs…"
+          empty={
+            <EmptyState
+              icon={<History className="size-6" />}
+              title="No runs yet."
+              description="Trigger the task to see its first run here."
+              className="py-8"
+            />
+          }
+        >
           <ul className="flex flex-col divide-y rounded-md border">
             {runs.map((r) => {
               const open = expanded === r.id
@@ -828,7 +854,7 @@ function RunsDialog({
               )
             })}
           </ul>
-        )}
+        </DataState>
 
         <DialogFooter>
           <Button variant="outline" onClick={onClose} data-action="task-runs-close">
@@ -854,3 +880,5 @@ function countBy<T>(arr: T[], key: (x: T) => string): Record<string, number> {
     return acc
   }, {})
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/search.tsx b/app/routes/search.tsx
index 29e0b63..1765a85 100644
--- a/app/routes/search.tsx
+++ b/app/routes/search.tsx
@@ -18,15 +18,13 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import {
-  AlertBanner,
-  ConfirmDialog,
-  EmptyState,
-  LoadingOverlay,
-} from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
+import { useToast } from "@crema/notification-ui"
 import { KpiTile, formatCompact } from "@crema/dashboard-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError, ErrorState } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
 import {
@@ -54,7 +52,6 @@ import {
 import { Textarea } from "~/components/ui/textarea"
 import {
   searchAdmin,
-  SearchAdminError,
   type CorpusSummary,
   type TenantSummary,
 } from "~/lib/search-admin"
@@ -74,12 +71,16 @@ type EditorState =
 
 export default function SearchRoute() {
   const session = useSession()
+  const toast = useToast()
 
   const [tenants, setTenants] = useState<TenantSummary[]>([])
   const [corpora, setCorpora] = useState<Row[]>([])
   const [loading, setLoading] = useState(false)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // arcadia-search is a separate sidecar, so this is often a plain Error /
+  // TypeError (connection refused) rather than an ArcadiaError. Pass it through
+  // raw — `describeError` already turns that into "Can't reach arcadia".
+  const [error, setError] = useState<unknown>(null)
+  const [corporaError, setCorporaError] = useState<unknown>(null)
   const [editor, setEditor] = useState<EditorState>(null)
   const [pendingDeleteTenant, setPendingDeleteTenant] = useState<string | null>(
     null,
@@ -91,44 +92,42 @@ export default function SearchRoute() {
   const [restartConfirm, setRestartConfirm] = useState(false)
   const [rebuilding, setRebuilding] = useState<string | null>(null)
 
-  const reportError = useCallback((err: unknown, fallback: string) => {
-    setError(
-      err instanceof SearchAdminError
-        ? `${err.status}: ${err.message}`
-        : err instanceof Error
-          ? err.message
-          : fallback,
-    )
-  }, [])
-
   const refresh = useCallback(async () => {
     setLoading(true)
     setError(null)
+    setCorporaError(null)
     try {
       const tRes = await searchAdmin.listTenants()
       setTenants(tRes.tenants)
-      // Fan out per-tenant corpus lookups in parallel.
-      const cByT = await Promise.all(
-        tRes.tenants.map(async (t) => {
-          try {
-            const r = await searchAdmin.listCorpora(t.id)
-            return r.corpora
-          } catch {
-            return []
-          }
-        }),
+
+      // Fan out per-tenant corpus lookups in parallel. A tenant whose lookup
+      // fails no longer disappears silently: if every lookup failed we surface
+      // the failure instead of rendering "No corpora yet."
+      const settled = await Promise.allSettled(
+        tRes.tenants.map((t) => searchAdmin.listCorpora(t.id)),
       )
-      const flat: Row[] = cByT.flat().map((c) => ({
-        ...c,
-        rowId: `${c.tenant}/${c.corpus}`,
-      }))
-      setCorpora(flat)
+      const ok = settled.filter(
+        (r): r is PromiseFulfilledResult<{ corpora: CorpusSummary[] }> =>
+          r.status === "fulfilled",
+      )
+      const firstFailure = settled.find((r) => r.status === "rejected")
+
+      setCorpora(
+        ok
+          .flatMap((r) => r.value.corpora)
+          .map((c) => ({ ...c, rowId: `${c.tenant}/${c.corpus}` })),
+      )
+      if (settled.length > 0 && ok.length === 0 && firstFailure) {
+        setCorporaError((firstFailure as PromiseRejectedResult).reason)
+      }
     } catch (err) {
-      reportError(err, "Failed to load search admin state.")
+      setError(err)
+      setTenants([])
+      setCorpora([])
     } finally {
       setLoading(false)
     }
-  }, [reportError])
+  }, [])
 
   useEffect(() => {
     if (!session) return
@@ -163,20 +162,19 @@ export default function SearchRoute() {
     async (tenant: string, corpus: string) => {
       const id = `${tenant}/${corpus}`
       setRebuilding(id)
-      setError(null)
       try {
         const out = await searchAdmin.rebuild(tenant, corpus)
-        setInfo(
-          `Rebuilt ${tenant}/${corpus} — ${out.chunk_count} chunks indexed.`,
-        )
         await refresh()
+        toast.success(`Rebuilt ${id}`, {
+          description: `${out.chunk_count} chunks indexed.`,
+        })
       } catch (err) {
-        reportError(err, "Rebuild failed.")
+        toast.error(errorMessage(err, `rebuild ${id}`))
       } finally {
         setRebuilding(null)
       }
     },
-    [refresh, reportError],
+    [refresh, toast],
   )
 
   return (
@@ -238,61 +236,69 @@ export default function SearchRoute() {
           </div>
         </header>
 
+        {/* A standing configuration fact, not a load failure — so it isn't an
+            error state and it isn't dismissible. It stays until it's fixed. */}
         {!searchAdmin.hasToken ? (
-          <AlertBanner variant="warning">
-            VITE_ARCADIA_SEARCH_ADMIN_TOKEN is unset. The Search section will
-            return 401 until the bearer token is configured. Endpoint:{" "}
-            <code className="font-mono">{searchAdmin.baseUrl}</code>
-          </AlertBanner>
+          <div
+            role="note"
+            className="rounded-md border bg-muted/40 px-3 py-2.5 text-sm"
+            data-action="search-token-missing"
+          >
+            <p className="font-medium">Admin token not configured</p>
+            <p className="text-muted-foreground">
+              VITE_ARCADIA_SEARCH_ADMIN_TOKEN is unset, so every call below will
+              come back 401. Endpoint:{" "}
+              <code className="font-mono">{searchAdmin.baseUrl}</code>
+            </p>
+          </div>
         ) : null}
+
+        {/* The whole screen hangs off one call to the sidecar. If that call
+            failed, nothing here loaded — say so once, rather than rendering
+            three cheerful empty states over a dead connection. */}
         {error ? (
-          <AlertBanner
-            variant="error"
-            dismissible
-            onDismiss={() => setError(null)}
-          >
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner
-            variant="success"
-            dismissible
-            onDismiss={() => setInfo(null)}
-          >
-            {info}
-          </AlertBanner>
-        ) : null}
+          <Card>
+            <CardContent className="p-0">
+              <ErrorState error={error} onRetry={refresh} />
+            </CardContent>
+          </Card>
+        ) : (
+          <>
+            <Card>
+              <CardHeader className="flex flex-row flex-wrap items-end gap-3">
+                <div className="grid grid-cols-3 gap-3 min-w-0">
+                  <KpiTile
+                    label="Tenants"
+                    value={formatCompact(tenants.length)}
+                  />
+                  <KpiTile
+                    label="Corpora indexed"
+                    value={`${totals.indexed} / ${corpora.length}`}
+                  />
+                  <KpiTile label="Docs" value={formatCompact(totals.docs)} />
+                </div>
+              </CardHeader>
+            </Card>
 
-        <Card>
-          <CardHeader className="flex flex-row flex-wrap items-end gap-3">
-            <div className="grid grid-cols-3 gap-3 min-w-0">
-              <KpiTile
-                label="Tenants"
-                value={formatCompact(tenants.length)}
-              />
-              <KpiTile
-                label="Corpora indexed"
-                value={`${totals.indexed} / ${corpora.length}`}
-              />
-              <KpiTile label="Docs" value={formatCompact(totals.docs)} />
-            </div>
-          </CardHeader>
-        </Card>
+            <TenantsCard
+              tenants={tenants}
+              loading={loading}
+              onRetry={refresh}
+              onDelete={(id) => setPendingDeleteTenant(id)}
+            />
 
-        <TenantsCard
-          tenants={tenants}
-          onDelete={(id) => setPendingDeleteTenant(id)}
-        />
-
-        <CorporaCard
-          corpora={corpora}
-          loading={loading}
-          rebuildingId={rebuilding}
-          onRebuild={rebuild}
-          onEdit={(t, c) => setEditor({ kind: "edit-corpus", tenant: t, corpus: c })}
-          onDelete={(t, c) => setPendingDeleteCorpus({ tenant: t, corpus: c })}
-        />
+            <CorporaCard
+              corpora={corpora}
+              loading={loading}
+              error={corporaError}
+              onRetry={refresh}
+              rebuildingId={rebuilding}
+              onRebuild={rebuild}
+              onEdit={(t, c) => setEditor({ kind: "edit-corpus", tenant: t, corpus: c })}
+              onDelete={(t, c) => setPendingDeleteCorpus({ tenant: t, corpus: c })}
+            />
+          </>
+        )}
       </div>
 
       {/* New tenant */}
@@ -301,10 +307,9 @@ export default function SearchRoute() {
         onClose={() => setEditor(null)}
         onCreated={async (msg) => {
           setEditor(null)
-          if (msg) setInfo(msg)
           await refresh()
+          toast.success(msg)
         }}
-        onError={(msg) => setError(msg)}
       />
 
       {/* New / edit corpus */}
@@ -318,10 +323,9 @@ export default function SearchRoute() {
         onClose={() => setEditor(null)}
         onSaved={async (msg) => {
           setEditor(null)
-          if (msg) setInfo(msg)
           await refresh()
+          toast.success(msg)
         }}
-        onError={(msg) => setError(msg)}
       />
 
       {/* Delete tenant */}
@@ -334,14 +338,15 @@ export default function SearchRoute() {
         variant="danger"
         onConfirm={async () => {
           if (!pendingDeleteTenant) return
+          const id = pendingDeleteTenant
           try {
-            await searchAdmin.deleteTenant(pendingDeleteTenant)
-            setInfo(`Tenant ${pendingDeleteTenant} deleted.`)
+            await searchAdmin.deleteTenant(id)
             setPendingDeleteTenant(null)
             await refresh()
+            toast.success(`Deleted tenant ${id}`)
           } catch (err) {
-            reportError(err, "Delete failed.")
             setPendingDeleteTenant(null)
+            toast.error(errorMessage(err, `delete tenant ${id}`))
           }
         }}
       />
@@ -363,12 +368,12 @@ export default function SearchRoute() {
           const { tenant, corpus } = pendingDeleteCorpus
           try {
             await searchAdmin.deleteCorpus(tenant, corpus)
-            setInfo(`Deleted ${tenant}/${corpus}.`)
             setPendingDeleteCorpus(null)
             await refresh()
+            toast.success(`Deleted ${tenant}/${corpus}`)
           } catch (err) {
-            reportError(err, "Delete failed.")
             setPendingDeleteCorpus(null)
+            toast.error(errorMessage(err, `delete ${tenant}/${corpus}`))
           }
         }}
       />
@@ -385,9 +390,9 @@ export default function SearchRoute() {
           setRestartConfirm(false)
           try {
             await searchAdmin.restart()
-            setInfo("Restart requested.")
+            toast.success("Requested a restart of arcadia-search")
           } catch (err) {
-            reportError(err, "Restart request failed.")
+            toast.error(errorMessage(err, "restart arcadia-search"))
           }
         }}
       />
@@ -399,9 +404,13 @@ export default function SearchRoute() {
 
 function TenantsCard({
   tenants,
+  loading,
+  onRetry,
   onDelete,
 }: {
   tenants: TenantSummary[]
+  loading: boolean
+  onRetry: () => void
   onDelete: (id: string) => void
 }) {
   return (
@@ -409,14 +418,23 @@ function TenantsCard({
       <CardHeader>
         <h2 className="text-base font-semibold">Tenants</h2>
       </CardHeader>
-      <CardContent className="p-4">
-        {tenants.length === 0 ? (
-          <EmptyState
-            title="No tenants yet."
-            description="Create one to start adding corpora."
-            className="py-8"
-          />
-        ) : (
+      <CardContent className="relative p-4">
+        {/* The sidecar's own failure is rendered once at page level, so by the
+            time we get here the load succeeded — this empty state is true. */}
+        <DataState
+          loading={loading}
+          error={null}
+          isEmpty={tenants.length === 0}
+          onRetry={onRetry}
+          loadingLabel="Loading tenants…"
+          empty={
+            <EmptyState
+              title="No tenants yet."
+              description="Create one to start adding corpora."
+              className="py-8"
+            />
+          }
+        >
           <ul className="flex flex-wrap gap-2">
             {tenants.map((t) => (
               <li
@@ -439,7 +457,7 @@ function TenantsCard({
               </li>
             ))}
           </ul>
-        )}
+        </DataState>
       </CardContent>
     </Card>
   )
@@ -450,6 +468,8 @@ function TenantsCard({
 function CorporaCard({
   corpora,
   loading,
+  error,
+  onRetry,
   rebuildingId,
   onRebuild,
   onEdit,
@@ -457,6 +477,8 @@ function CorporaCard({
 }: {
   corpora: Row[]
   loading: boolean
+  error: unknown
+  onRetry: () => void
   rebuildingId: string | null
   onRebuild: (tenant: string, corpus: string) => void
   onEdit: (tenant: string, corpus: string) => void
@@ -593,39 +615,40 @@ function CorporaCard({
         </div>
       </CardHeader>
       <CardContent className="relative p-0">
-        <LoadingOverlay
-          active={loading && corpora.length === 0}
-          label="Loading corpora…"
-        />
-        {table.total === 0 && !loading ? (
-          <EmptyState
-            icon={<Database className="size-6" />}
-            title={search ? "No matches." : "No corpora yet."}
-            description={
-              search ? "Try a different search." : "Create one above."
-            }
-            className="py-12"
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={table.total === 0}
+          onRetry={onRetry}
+          loadingLabel="Loading corpora…"
+          empty={
+            <EmptyState
+              icon={<Database className="size-6" />}
+              title={search ? "No matches." : "No corpora yet."}
+              description={
+                search ? "Try a different search." : "Create one above."
+              }
+              className="py-12"
+            />
+          }
+        >
+          <DataTable
+            columns={columns}
+            rows={table.pageRows}
+            getRowId={(r) => r.rowId}
+            sort={table.sort}
+            onSortToggle={table.toggleSort}
+            loading={loading && corpora.length > 0}
+            stickyHeader
           />
-        ) : (
-          <>
-            <DataTable
-              columns={columns}
-              rows={table.pageRows}
-              getRowId={(r) => r.rowId}
-              sort={table.sort}
-              onSortToggle={table.toggleSort}
-              loading={loading && corpora.length > 0}
-              stickyHeader
-            />
-            <Pagination
-              page={table.page}
-              pageSize={table.pageSize}
-              total={table.total}
-              onPageChange={table.setPage}
-              onPageSizeChange={table.setPageSize}
-            />
-          </>
-        )}
+          <Pagination
+            page={table.page}
+            pageSize={table.pageSize}
+            total={table.total}
+            onPageChange={table.setPage}
+            onPageSizeChange={table.setPageSize}
+          />
+        </DataState>
       </CardContent>
     </Card>
   )
@@ -637,31 +660,30 @@ function NewTenantDialog({
   open,
   onClose,
   onCreated,
-  onError,
 }: {
   open: boolean
   onClose: () => void
-  onCreated: (msg?: string) => Promise<void>
-  onError: (msg: string) => void
+  onCreated: (msg: string) => Promise<void>
 }) {
   const [id, setId] = useState("")
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
-    if (!open) setId("")
+    if (!open) {
+      setId("")
+      setError(null)
+    }
   }, [open])
 
   const submit = async () => {
+    setError(null)
     setSaving(true)
     try {
       await searchAdmin.createTenant(id)
-      await onCreated(`Tenant ${id} created.`)
+      await onCreated(`Created tenant ${id}`)
     } catch (err) {
-      onError(
-        err instanceof SearchAdminError
-          ? `${err.status}: ${err.message}`
-          : "Create failed.",
-      )
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -691,6 +713,9 @@ function NewTenantDialog({
             data-action="tenant-form-id"
           />
         </div>
+
+        {error ? <DialogError error={error} context="create the tenant" /> : null}
+
         <DialogFooter>
           <Button
             variant="outline"
@@ -738,7 +763,6 @@ function CorpusEditor({
   tenants,
   onClose,
   onSaved,
-  onError,
 }: {
   editor:
     | { kind: "new-corpus"; tenant: string }
@@ -746,13 +770,15 @@ function CorpusEditor({
     | null
   tenants: TenantSummary[]
   onClose: () => void
-  onSaved: (msg?: string) => Promise<void>
-  onError: (msg: string) => void
+  onSaved: (msg: string) => Promise<void>
 }) {
   const [tenant, setTenant] = useState("")
   const [text, setText] = useState("")
   const [saving, setSaving] = useState(false)
   const [loading, setLoading] = useState(false)
+  // Covers both the hydrate-on-open failure and the save failure. Either way
+  // the operator is looking at this dialog, so this is where it has to speak.
+  const [error, setError] = useState<unknown>(null)
 
   const isEdit = editor?.kind === "edit-corpus"
   const headerCorpus = isEdit ? editor.corpus : ""
@@ -761,6 +787,7 @@ function CorpusEditor({
   useEffect(() => {
     if (!editor) return
     setTenant(editor.tenant)
+    setError(null)
     if (editor.kind === "edit-corpus") {
       setLoading(true)
       searchAdmin
@@ -768,22 +795,17 @@ function CorpusEditor({
         .then((res) => {
           setText(JSON.stringify(res.config, null, 2))
         })
-        .catch((err) => {
-          onError(
-            err instanceof SearchAdminError
-              ? `${err.status}: ${err.message}`
-              : "Load failed.",
-          )
-        })
+        .catch((err) => setError(err))
         .finally(() => setLoading(false))
     } else {
       setText(CORPUS_CONFIG_TEMPLATE)
     }
-  }, [editor, onError])
+  }, [editor])
 
   if (!editor) return null
 
   const submit = async () => {
+    setError(null)
     setSaving(true)
     try {
       const parsed = JSON.parse(text)
@@ -796,19 +818,14 @@ function CorpusEditor({
           throw new Error('config must have a string "corpus" field')
         }
         await searchAdmin.createCorpus(tenant, parsed)
-        await onSaved(`Created ${tenant}/${corpus}.`)
+        await onSaved(`Created ${tenant}/${corpus}`)
       } else {
         await searchAdmin.updateCorpus(editor.tenant, editor.corpus, parsed)
-        await onSaved(`Updated ${editor.tenant}/${editor.corpus}.`)
+        await onSaved(`Updated ${editor.tenant}/${editor.corpus}`)
       }
     } catch (err) {
-      onError(
-        err instanceof SearchAdminError
-          ? `${err.status}: ${err.message}`
-          : err instanceof Error
-            ? err.message
-            : "Save failed.",
-      )
+      // The JSON the operator just wrote stays in the textarea.
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -865,6 +882,13 @@ function CorpusEditor({
           </div>
         </div>
 
+        {error ? (
+          <DialogError
+            error={error}
+            context={isEdit ? "save the corpus" : "create the corpus"}
+          />
+        ) : null}
+
         <DialogFooter>
           <Button
             variant="outline"
@@ -891,3 +915,5 @@ function CorpusEditor({
     </Dialog>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/secrets.tsx b/app/routes/secrets.tsx
index e6aff59..68cd0b9 100644
--- a/app/routes/secrets.tsx
+++ b/app/routes/secrets.tsx
@@ -12,7 +12,8 @@ import {
   Trash2,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -25,9 +26,11 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Button } from "~/components/ui/button"
 import {
   Card,
@@ -91,11 +94,13 @@ type EditorState =
 export default function SecretsRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
   const [secrets, setSecrets] = useState<Secret[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // The raw thrown value — `DataState` normalises it into plain language. A
+  // secrets list that failed to load must never read as "no secrets yet".
+  const [error, setError] = useState<unknown>(null)
   const [search, setSearch] = useState("")
   const [categoryFilter, setCategoryFilter] = useState<"all" | SecretCategory>("all")
   const [editor, setEditor] = useState<EditorState>(null)
@@ -107,7 +112,7 @@ export default function SecretsRoute() {
     try {
       setSecrets(await listSecrets(arcadia))
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load secrets.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -204,15 +209,14 @@ export default function SecretsRoute() {
               refresh,
               setEditor,
               setPendingDelete,
-              setError,
-              setInfo,
+              toast,
             })}
             triggerDataAction={`secret-${s.name}-actions`}
           />
         ),
       },
     ],
-    [arcadia, refresh],
+    [arcadia, refresh, toast],
   )
 
   const summary = useMemo(
@@ -279,17 +283,6 @@ export default function SecretsRoute() {
           </div>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Card>
           <CardHeader className="flex flex-row flex-wrap items-center gap-3">
             <SearchInput
@@ -321,41 +314,45 @@ export default function SecretsRoute() {
           </CardHeader>
 
           <CardContent className="relative p-0">
-            <LoadingOverlay active={loading && secrets.length === 0} label="Loading secrets…" />
-            {table.total === 0 && !loading ? (
-              <EmptyState
-                title={
-                  search || categoryFilter !== "all"
-                    ? "No secrets match those filters."
-                    : "No secrets yet."
-                }
-                description={
-                  search || categoryFilter !== "all"
-                    ? "Try a different search or category."
-                    : "Create your first secret. The value is encrypted at rest and never returned by the API."
-                }
-                className="py-12"
+            <DataState
+              loading={loading}
+              error={error}
+              isEmpty={table.total === 0}
+              onRetry={refresh}
+              loadingLabel="Loading secrets…"
+              empty={
+                <EmptyState
+                  title={
+                    search || categoryFilter !== "all"
+                      ? "No secrets match those filters."
+                      : "No secrets yet."
+                  }
+                  description={
+                    search || categoryFilter !== "all"
+                      ? "Try a different search or category."
+                      : "Create your first secret. The value is encrypted at rest and never returned by the API."
+                  }
+                  className="py-12"
+                />
+              }
+            >
+              <DataTable
+                columns={columns}
+                rows={table.pageRows}
+                getRowId={(s) => s.id}
+                sort={table.sort}
+                onSortToggle={table.toggleSort}
+                loading={loading && secrets.length > 0}
+                stickyHeader
               />
-            ) : (
-              <>
-                <DataTable
-                  columns={columns}
-                  rows={table.pageRows}
-                  getRowId={(s) => s.id}
-                  sort={table.sort}
-                  onSortToggle={table.toggleSort}
-                  loading={loading && secrets.length > 0}
-                  stickyHeader
-                />
-                <Pagination
-                  page={table.page}
-                  pageSize={table.pageSize}
-                  total={table.total}
-                  onPageChange={table.setPage}
-                  onPageSizeChange={table.setPageSize}
-                />
-              </>
-            )}
+              <Pagination
+                page={table.page}
+                pageSize={table.pageSize}
+                total={table.total}
+                onPageChange={table.setPage}
+                onPageSizeChange={table.setPageSize}
+              />
+            </DataState>
           </CardContent>
         </Card>
       </div>
@@ -373,14 +370,15 @@ export default function SecretsRoute() {
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const target = pendingDelete
           try {
-            await deleteSecret(arcadia, pendingDelete.id)
+            await deleteSecret(arcadia, target.id)
             setPendingDelete(null)
-            setInfo("Secret deleted.")
             await refresh()
+            toast.success(`Deleted ${target.name}`)
           } catch (err) {
-            setError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete ${target.name}`))
           }
         }}
       />
@@ -388,12 +386,13 @@ export default function SecretsRoute() {
       <SecretEditorDialog
         state={editor}
         onClose={() => setEditor(null)}
-        onSaved={async (msg) => {
-          setEditor(null)
-          if (msg) setInfo(msg)
+        onSaved={async (msg, opts) => {
+          // The versions dialog stays open across a rollback — only the
+          // create/edit/rotate flows close on success.
+          if (!opts?.keepOpen) setEditor(null)
           await refresh()
+          toast.success(msg)
         }}
-        onError={setError}
       />
     </AppShell>
   )
@@ -420,11 +419,10 @@ function rowActions(
     refresh: () => Promise<void>
     setEditor: (e: EditorState) => void
     setPendingDelete: (s: Secret | null) => void
-    setError: (m: string | null) => void
-    setInfo: (m: string | null) => void
+    toast: ReturnType<typeof useToast>
   },
 ): ActionItem[] {
-  const { arcadia, refresh, setEditor, setPendingDelete, setError, setInfo } = ctx
+  const { arcadia, refresh, setEditor, setPendingDelete, toast } = ctx
   const items: ActionItem[] = []
 
   items.push({
@@ -457,10 +455,10 @@ function rowActions(
       onSelect: async () => {
         try {
           await disableSecret(arcadia, s.id)
-          setInfo(`${s.name} disabled.`)
           await refresh()
+          toast.success(`Disabled ${s.name}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Disable failed.")
+          toast.error(errorMessage(err, `disable ${s.name}`))
         }
       },
     })
@@ -473,10 +471,10 @@ function rowActions(
       onSelect: async () => {
         try {
           await enableSecret(arcadia, s.id)
-          setInfo(`${s.name} enabled.`)
           await refresh()
+          toast.success(`Enabled ${s.name}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Enable failed.")
+          toast.error(errorMessage(err, `enable ${s.name}`))
         }
       },
     })
@@ -494,41 +492,43 @@ function rowActions(
   return items
 }
 
+/** What the parent does when a dialog reports success. */
+type OnSaved = (message: string, opts?: { keepOpen?: boolean }) => Promise<void>
+
 function SecretEditorDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: EditorState
   onClose: () => void
-  onSaved: (info?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: OnSaved
 }) {
   if (state?.mode === "versions") {
-    return <VersionsDialog state={state} onClose={onClose} onSaved={onSaved} onError={onError} />
+    return <VersionsDialog state={state} onClose={onClose} onSaved={onSaved} />
   }
   if (state?.mode === "rotate") {
-    return <RotateDialog state={state} onClose={onClose} onSaved={onSaved} onError={onError} />
+    return <RotateDialog state={state} onClose={onClose} onSaved={onSaved} />
   }
-  return <UpsertDialog state={state} onClose={onClose} onSaved={onSaved} onError={onError} />
+  return <UpsertDialog state={state} onClose={onClose} onSaved={onSaved} />
 }
 
 function UpsertDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: EditorState
   onClose: () => void
-  onSaved: (info?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: OnSaved
 }) {
   const arcadia = useArcadiaClient()
   const open = state?.mode === "create" || state?.mode === "edit"
   const isEdit = state?.mode === "edit"
   const initial = isEdit ? state.secret : null
+  // A failed save renders here, not on the page behind the scrim — and the
+  // form keeps its state, including the value the operator just pasted.
+  const [error, setError] = useState<unknown>(null)
 
   const [name, setName] = useState("")
   const [value, setValue] = useState("")
@@ -545,7 +545,11 @@ function UpsertDialog({
   const [saving, setSaving] = useState(false)
 
   useEffect(() => {
-    if (!open) return
+    if (!open) {
+      setError(null)
+      return
+    }
+    setError(null)
     if (initial) {
       setName(initial.name)
       setValue("")
@@ -577,18 +581,19 @@ function UpsertDialog({
 
   const generate = async () => {
     setGenerating(true)
+    setError(null)
     try {
       const v = await generateSecretValue(arcadia, { length: 48 })
       setValue(v)
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Generate failed.")
+      setError(err)
     } finally {
       setGenerating(false)
     }
   }
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       const tags = csv(tagsText)
@@ -613,7 +618,7 @@ function UpsertDialog({
           expires_at,
           rotation_interval_days,
         })
-        await onSaved("Secret metadata updated.")
+        await onSaved(`Updated ${initial.name}`)
       } else {
         if (!value) throw new Error("A value is required for new secrets.")
         const input: SecretCreateInput = {
@@ -630,10 +635,10 @@ function UpsertDialog({
           rotation_interval_days,
         }
         await createSecret(arcadia, input)
-        await onSaved("Secret created.")
+        await onSaved(`Created ${name}`)
       }
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : err instanceof Error ? err.message : "Save failed.")
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -812,6 +817,13 @@ function UpsertDialog({
           </div>
         </div>
 
+        {error ? (
+          <DialogError
+            error={error}
+            context={isEdit ? "save the secret" : "create the secret"}
+          />
+        ) : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} disabled={saving} data-action="secret-form-cancel">
             Cancel
@@ -834,43 +846,46 @@ function RotateDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: { mode: "rotate"; secret: Secret }
   onClose: () => void
-  onSaved: (info?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: OnSaved
 }) {
   const arcadia = useArcadiaClient()
   const [value, setValue] = useState("")
   const [note, setNote] = useState("")
   const [saving, setSaving] = useState(false)
   const [generating, setGenerating] = useState(false)
+  // Rotation is destructive-adjacent: if it fails, the operator must see why
+  // *here*, with the new value still in the field.
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     setValue("")
     setNote("")
+    setError(null)
   }, [state])
 
   const generate = async () => {
     setGenerating(true)
+    setError(null)
     try {
       setValue(await generateSecretValue(arcadia, { length: 48 }))
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Generate failed.")
+      setError(err)
     } finally {
       setGenerating(false)
     }
   }
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       await rotateSecret(arcadia, state.secret.id, { value, note: note || undefined })
-      await onSaved(`${state.secret.name} rotated.`)
+      await onSaved(`Rotated ${state.secret.name}`)
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : err instanceof Error ? err.message : "Rotate failed.")
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -924,6 +939,10 @@ function RotateDialog({
           </div>
         </div>
 
+        {error ? (
+          <DialogError error={error} context={`rotate ${state.secret.name}`} />
+        ) : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} disabled={saving} data-action="secret-rotate-cancel">
             Cancel
@@ -942,28 +961,31 @@ function VersionsDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: { mode: "versions"; secret: Secret }
   onClose: () => void
-  onSaved: (info?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: OnSaved
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const [versions, setVersions] = useState<SecretVersion[]>([])
   const [loading, setLoading] = useState(true)
+  // A versions load that failed is not a secret with no history. Own error
+  // state, rendered in place of the list.
+  const [error, setError] = useState<unknown>(null)
+  const [reloadKey, setReloadKey] = useState(0)
   const [pendingRollback, setPendingRollback] = useState<SecretVersion | null>(null)
 
   useEffect(() => {
     let mounted = true
     setLoading(true)
+    setError(null)
     listSecretVersions(arcadia, state.secret.id)
       .then((v) => {
         if (mounted) setVersions(v.sort((a, b) => b.version - a.version))
       })
       .catch((err) => {
-        if (mounted)
-          onError(err instanceof ArcadiaError ? err.message : "Failed to load versions.")
+        if (mounted) setError(err)
       })
       .finally(() => {
         if (mounted) setLoading(false)
@@ -971,7 +993,7 @@ function VersionsDialog({
     return () => {
       mounted = false
     }
-  }, [arcadia, state.secret.id, onError])
+  }, [arcadia, state.secret.id, reloadKey])
 
   return (
     <Dialog open onOpenChange={(o) => !o && onClose()}>
@@ -983,15 +1005,18 @@ function VersionsDialog({
           </DialogDescription>
         </DialogHeader>
 
-        {loading ? (
-          <div className="flex items-center justify-center py-6 text-sm text-muted-foreground">
-            <RefreshCw className="mr-2 size-4 animate-spin" /> Loading…
-          </div>
-        ) : versions.length === 0 ? (
-          <p className="py-6 text-center text-sm text-muted-foreground">
-            No previous versions yet. Rotate the value to create one.
-          </p>
-        ) : (
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={versions.length === 0}
+          onRetry={() => setReloadKey((n) => n + 1)}
+          loadingLabel="Loading versions…"
+          empty={
+            <p className="py-6 text-center text-sm text-muted-foreground">
+              No previous versions yet. Rotate the value to create one.
+            </p>
+          }
+        >
           <ul className="flex flex-col divide-y rounded-md border">
             {versions.map((v) => (
               <li key={v.id} className="flex items-center justify-between gap-3 px-3 py-2">
@@ -1015,7 +1040,7 @@ function VersionsDialog({
               </li>
             ))}
           </ul>
-        )}
+        </DataState>
 
         <DialogFooter>
           <Button variant="outline" onClick={onClose} data-action="secret-versions-close">
@@ -1036,13 +1061,25 @@ function VersionsDialog({
           variant="default"
           onConfirm={async () => {
             if (!pendingRollback) return
+            const target = pendingRollback
             try {
-              await rollbackSecret(arcadia, state.secret.id, pendingRollback.version)
+              await rollbackSecret(arcadia, state.secret.id, target.version)
               setPendingRollback(null)
-              await onSaved(`Rolled back to version ${pendingRollback.version}.`)
+              setReloadKey((n) => n + 1)
+              // Keep the versions dialog open — the rollback minted a new
+              // version, and the operator is looking right at the list.
+              await onSaved(
+                `Rolled ${state.secret.name} back to version ${target.version}`,
+                { keepOpen: true },
+              )
             } catch (err) {
-              onError(err instanceof ArcadiaError ? err.message : "Rollback failed.")
               setPendingRollback(null)
+              toast.error(
+                errorMessage(
+                  err,
+                  `roll ${state.secret.name} back to version ${target.version}`,
+                ),
+              )
             }
           }}
         />
@@ -1065,3 +1102,5 @@ function countBy<T>(arr: T[], key: (x: T) => string): Record<string, number> {
     return acc
   }, {})
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/settings.tsx b/app/routes/settings.tsx
index 6eef29c..3886996 100644
--- a/app/routes/settings.tsx
+++ b/app/routes/settings.tsx
@@ -1,12 +1,15 @@
-import { useEffect, useState } from "react"
+import { useCallback, useEffect, useState } from "react"
+import { Link } from "react-router"
 import {
-  Cpu,
+  Bot,
   Palette,
   User as UserIcon,
   Info,
   Users,
+  Building2,
   Plus,
   Trash2,
+  ExternalLink,
 } from "lucide-react"
 import { listModels } from "@crema/llm-ui"
 import {
@@ -16,12 +19,24 @@ import {
   useSettings as useProviderSettings,
   type LLMProvidersSettings,
 } from "@crema/llm-providers-ui"
-import { useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
 
 import { probeProxy, type LLMProxyProvider } from "~/lib/arcadia/llm-proxy"
 import { LlmConfigurationsPanel } from "~/components/settings/llm-configurations-panel"
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState } from "~/components/data-state"
+import { ThemeToggle } from "~/components/layout/theme-toggle"
+import { BackgroundPicker } from "~/components/layout/background-picker"
+import { FontSizePicker } from "~/components/layout/font-size-picker"
+import { SurfacePicker } from "~/components/layout/surface-picker"
+import { BrandingTab } from "~/components/tenant-detail/branding-tab"
+import { LocalizationTab } from "~/components/tenant-detail/localization-tab"
+import { getTenant, type Tenant } from "~/lib/arcadia/tenants"
+import { useCapabilities } from "~/lib/capabilities"
+import { useSession } from "~/lib/session"
 import { Button } from "~/components/ui/button"
+import { Input } from "~/components/ui/input"
+import { Textarea } from "~/components/ui/textarea"
 import {
   Card,
   CardContent,
@@ -44,20 +59,42 @@ export const meta = () => pageTitle("Settings")
 
 const SECTION_KEY = "crema.settings.section"
 
-type SectionId = "llm" | "agents" | "appearance" | "account" | "about"
+type SectionId =
+  | "assistant"
+  | "personas"
+  | "tenant"
+  | "appearance"
+  | "account"
+  | "about"
 
-const sections: {
+type SectionDef = {
   id: SectionId
   label: string
   icon: React.ComponentType<{ className?: string }>
   description: string
-}[] = [
-  { id: "llm", label: "LLM", icon: Cpu, description: "Model endpoint & budgets" },
+  /** When set, the section only shows if the session holds this capability. */
+  requiresCapability?: string
+}
+
+const sections: SectionDef[] = [
   {
-    id: "agents",
-    label: "Agents",
+    id: "assistant",
+    label: "Assistant",
+    icon: Bot,
+    description: "Model, endpoint & budgets",
+  },
+  {
+    id: "personas",
+    label: "Personas",
     icon: Users,
-    description: "Personas, roles, sub-prompts",
+    description: "Assistant personas (this browser)",
+  },
+  {
+    id: "tenant",
+    label: "Tenant",
+    icon: Building2,
+    description: "Branding & localization",
+    requiresCapability: "platform.tenants",
   },
   {
     id: "appearance",
@@ -65,7 +102,7 @@ const sections: {
     icon: Palette,
     description: "Theme, font size, surface, background",
   },
-  { id: "account", label: "Account", icon: UserIcon, description: "Profile & preferences" },
+  { id: "account", label: "Account", icon: UserIcon, description: "Your profile" },
   { id: "about", label: "About", icon: Info, description: "Version & credits" },
 ]
 
@@ -157,13 +194,23 @@ export default function SettingsRoute() {
     }
   }
 
+  const caps = useCapabilities()
+  const visibleSections = sections.filter(
+    (s) => !s.requiresCapability || caps.has(s.requiresCapability as never),
+  )
+
   const [section, setSection] = useState<SectionId>(() => {
-    if (typeof window === "undefined") return "llm"
+    if (typeof window === "undefined") return "assistant"
     const stored = localStorage.getItem(SECTION_KEY)
     return sections.some((s) => s.id === stored)
       ? (stored as SectionId)
-      : "llm"
+      : "assistant"
   })
+  // If the stored section isn't available to this user (e.g. Tenant for a
+  // non-platform admin), fall back to Assistant.
+  useEffect(() => {
+    if (!visibleSections.some((s) => s.id === section)) setSection("assistant")
+  }, [visibleSections, section])
   useEffect(() => {
     if (typeof window !== "undefined")
       localStorage.setItem(SECTION_KEY, section)
@@ -176,7 +223,7 @@ export default function SettingsRoute() {
           aria-label="Settings sections"
           className="flex flex-row flex-wrap gap-1 md:flex-col md:flex-nowrap md:gap-0.5"
         >
-          {sections.map((s) => {
+          {visibleSections.map((s) => {
             const Icon = s.icon
             const active = section === s.id
             return (
@@ -211,7 +258,7 @@ export default function SettingsRoute() {
         </nav>
 
         <div className="min-w-0">
-          {section === "llm" && (
+          {section === "assistant" && (
             <div className="flex flex-col gap-4">
               <LlmConfigurationsPanel />
 
@@ -243,39 +290,37 @@ export default function SettingsRoute() {
             </div>
           )}
 
-          {section === "agents" && <AgentsPanel />}
+          {section === "personas" && <AgentsPanel />}
+
+          {section === "tenant" && <TenantSettingsSection />}
 
           {section === "appearance" && (
             <Card>
               <CardHeader>
                 <CardTitle>Appearance</CardTitle>
                 <CardDescription>
-                  Theme, font size, surface tint, and background atmosphere are
-                  in the appbar — the toggles up top write to localStorage and
-                  persist across sessions.
+                  Theme, density, and background for this browser. These are
+                  also in the top-right toolbar; they persist locally.
                 </CardDescription>
               </CardHeader>
-              <CardContent className="text-sm text-muted-foreground">
-                Use the icons in the appbar (top right) to change theme, font
-                size, surface tint, and background.
+              <CardContent className="flex flex-col divide-y">
+                <AppearanceRow label="Theme" hint="Light or dark.">
+                  <ThemeToggle />
+                </AppearanceRow>
+                <AppearanceRow label="Font size" hint="Base text scale.">
+                  <FontSizePicker />
+                </AppearanceRow>
+                <AppearanceRow label="Surface tint" hint="Panel background tint.">
+                  <SurfacePicker />
+                </AppearanceRow>
+                <AppearanceRow label="Background" hint="Ambient page atmosphere.">
+                  <BackgroundPicker />
+                </AppearanceRow>
               </CardContent>
             </Card>
           )}
 
-          {section === "account" && (
-            <Card>
-              <CardHeader>
-                <CardTitle>Account</CardTitle>
-                <CardDescription>
-                  Identity and profile preferences.
-                </CardDescription>
-              </CardHeader>
-              <CardContent className="text-sm text-muted-foreground">
-                Wire <code className="font-mono">~/lib/identity.ts</code> to a
-                real session to populate this panel.
-              </CardContent>
-            </Card>
-          )}
+          {section === "account" && <AccountSection />}
 
           {section === "about" && (
             <Card>
@@ -284,11 +329,8 @@ export default function SettingsRoute() {
                 <CardDescription>App version and credits.</CardDescription>
               </CardHeader>
               <CardContent className="space-y-1 text-sm text-muted-foreground">
+                <p>Arcadia Admin — operator console for arcadia-core.</p>
                 <p>Built on the Crema design system.</p>
-                <p>
-                  Hybrid traditional + AI-first scaffold with a virtual cursor
-                  and command bus for assistant-driven UI control.
-                </p>
               </CardContent>
             </Card>
           )}
@@ -316,6 +358,148 @@ function Field({
   )
 }
 
+function AppearanceRow({
+  label,
+  hint,
+  children,
+}: {
+  label: string
+  hint: string
+  children: React.ReactNode
+}) {
+  return (
+    <div className="flex items-center justify-between gap-4 py-3 first:pt-0 last:pb-0">
+      <div>
+        <div className="text-sm font-medium">{label}</div>
+        <div className="text-xs text-muted-foreground">{hint}</div>
+      </div>
+      {children}
+    </div>
+  )
+}
+
+function AccountSection() {
+  const session = useSession()
+  return (
+    <Card>
+      <CardHeader>
+        <CardTitle>Account</CardTitle>
+        <CardDescription>Your identity on this deployment.</CardDescription>
+      </CardHeader>
+      <CardContent className="flex flex-col gap-4">
+        <div className="grid gap-3 sm:grid-cols-2">
+          <ReadOnlyFact label="Name" value={session?.name ?? "—"} />
+          <ReadOnlyFact label="Email" value={session?.email ?? "—"} />
+          <ReadOnlyFact label="Active tenant" value={session?.tenantSlug ?? "—"} mono />
+          <ReadOnlyFact
+            label="Roles"
+            value={session?.roles?.length ? session.roles.join(", ") : "—"}
+          />
+        </div>
+        <div>
+          <Button asChild variant="outline" data-action="settings-account-profile">
+            <Link to="/profile">
+              Edit profile <ExternalLink className="size-4" />
+            </Link>
+          </Button>
+        </div>
+      </CardContent>
+    </Card>
+  )
+}
+
+function ReadOnlyFact({
+  label,
+  value,
+  mono,
+}: {
+  label: string
+  value: string
+  mono?: boolean
+}) {
+  return (
+    <div className="rounded-lg border bg-card/40 px-3 py-2">
+      <div className="text-xs uppercase tracking-wider text-muted-foreground">{label}</div>
+      <div className={`mt-0.5 text-sm font-medium ${mono ? "font-mono" : ""}`}>{value}</div>
+    </div>
+  )
+}
+
+/**
+ * Tenant settings — reuses the Phase-4 tenant-detail tab components, scoped to
+ * the operator's active tenant. The branding/localization endpoints are
+ * platform-gated, so this section is only offered to platform admins (see the
+ * `requiresCapability` on the section); if the load 403s anyway, DataState
+ * surfaces it cleanly.
+ */
+function TenantSettingsSection() {
+  const arcadia = useArcadiaClient()
+  const session = useSession()
+  const tenantId = session?.tenantId
+
+  const [tenant, setTenant] = useState<Tenant | null>(null)
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<unknown>(null)
+
+  const reload = useCallback(async () => {
+    if (!tenantId) {
+      setLoading(false)
+      return
+    }
+    setError(null)
+    setLoading(true)
+    try {
+      setTenant(await getTenant(arcadia, tenantId))
+    } catch (err) {
+      setError(err)
+    } finally {
+      setLoading(false)
+    }
+  }, [arcadia, tenantId])
+
+  useEffect(() => {
+    reload()
+  }, [reload])
+
+  return (
+    <div className="flex flex-col gap-4">
+      <p className="text-sm text-muted-foreground">
+        Branding and localization for your active tenant
+        {session?.tenantSlug ? (
+          <>
+            {" "}
+            (<code className="font-mono text-xs">{session.tenantSlug}</code>)
+          </>
+        ) : null}
+        . To manage a different tenant, open it from{" "}
+        <Link to="/tenants" className="underline">
+          Tenants
+        </Link>
+        .
+      </p>
+      <DataState
+        loading={loading}
+        error={error}
+        isEmpty={!tenant}
+        onRetry={reload}
+        loadingLabel="Loading tenant…"
+        empty={
+          <div className="rounded-lg border py-8 text-center text-sm text-muted-foreground">
+            No active tenant on this session.
+          </div>
+        }
+      >
+        {tenant ? (
+          <div className="flex flex-col gap-6">
+            <BrandingTab tenant={tenant} reload={reload} />
+            <LocalizationTab tenant={tenant} reload={reload} />
+          </div>
+        ) : null}
+      </DataState>
+    </div>
+  )
+}
+
 function AgentsPanel() {
   const agents = useAgents()
   const [activeId, setActiveId] = useState<string>(() => loadActiveAgentId())
@@ -352,12 +536,12 @@ function AgentsPanel() {
   return (
     <Card>
       <CardHeader>
-        <CardTitle>Agents</CardTitle>
+        <CardTitle>Personas</CardTitle>
         <CardDescription>
-          Personas with their own sub-system prompts. Switch the active one in
-          the chat status bar — the assistant inherits its skills, tone, and
-          scope. Lets you keep contexts focused: a coder agent doesn't carry
-          writing-task context; a writer doesn't carry codebase context.
+          Assistant personas with their own sub-system prompts. Switch the
+          active one in the chat status bar — the assistant inherits its skills,
+          tone, and scope. Stored in this browser only, not synced to your
+          account.
         </CardDescription>
       </CardHeader>
       <CardContent className="flex flex-col gap-4">
@@ -483,3 +667,5 @@ function AgentsPanel() {
     </Card>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/sso.tsx b/app/routes/sso.tsx
index 1db2bd3..fa1d0e9 100644
--- a/app/routes/sso.tsx
+++ b/app/routes/sso.tsx
@@ -9,7 +9,8 @@ import {
   X,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -18,21 +19,16 @@ import {
   Pagination,
   useTable,
   type ActionItem,
-  type BadgeTone,
   type Column,
 } from "@crema/table-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-} from "~/components/ui/card"
+import { Card, CardContent } from "~/components/ui/card"
 import {
   Dialog,
   DialogContent,
@@ -68,40 +64,65 @@ type Editor =
   | { kind: "edit"; idp: IdentityProvider }
   | null
 
+/** Who a SAML session belongs to, in the operator's words. */
+function sessionLabel(s: SamlSession): string {
+  return s.name_id ?? s.user_id
+}
+
 export default function SsoRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
+  // Two tabs, two independent fetches. They used to share one load that
+  // swallowed each failure with `.catch(() => [])`, so a broken endpoint was
+  // indistinguishable from "no identity providers".
   const [idps, setIdps] = useState<IdentityProvider[]>([])
+  const [idpsLoading, setIdpsLoading] = useState(true)
+  const [idpsError, setIdpsError] = useState<unknown>(null)
+
   const [sessions, setSessions] = useState<SamlSession[]>([])
-  const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  const [sessionsLoading, setSessionsLoading] = useState(true)
+  const [sessionsError, setSessionsError] = useState<unknown>(null)
+
   const [editor, setEditor] = useState<Editor>(null)
   const [pendingDelete, setPendingDelete] = useState<IdentityProvider | null>(null)
   const [pendingSessionDestroy, setPendingSessionDestroy] = useState<SamlSession | null>(null)
 
-  const refresh = useCallback(async () => {
-    setError(null)
-    setLoading(true)
+  const refreshIdps = useCallback(async () => {
+    setIdpsError(null)
+    setIdpsLoading(true)
     try {
-      const [i, s] = await Promise.all([
-        listIdentityProviders(arcadia).catch(() => [] as IdentityProvider[]),
-        listSamlSessions(arcadia).catch(() => [] as SamlSession[]),
-      ])
-      setIdps(i)
-      setSessions(s)
+      setIdps(await listIdentityProviders(arcadia))
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load SSO data.")
+      setIdpsError(err)
     } finally {
-      setLoading(false)
+      setIdpsLoading(false)
     }
   }, [arcadia])
 
+  const refreshSessions = useCallback(async () => {
+    setSessionsError(null)
+    setSessionsLoading(true)
+    try {
+      setSessions(await listSamlSessions(arcadia))
+    } catch (err) {
+      setSessionsError(err)
+    } finally {
+      setSessionsLoading(false)
+    }
+  }, [arcadia])
+
+  const refresh = useCallback(async () => {
+    await Promise.all([refreshIdps(), refreshSessions()])
+  }, [refreshIdps, refreshSessions])
+
   useEffect(() => {
     if (session) refresh()
   }, [session, refresh])
 
+  const loading = idpsLoading || sessionsLoading
+
   useRegisterContext("sso", {
     identity_providers: idps.length,
     enabled_idps: idps.filter((i) => i.enabled).length,
@@ -176,12 +197,13 @@ export default function SsoRoute() {
               label: i.enabled ? "Disable" : "Enable",
               dataAction: `idp-${i.id}-toggle`,
               onSelect: async () => {
+                const verb = i.enabled ? "disable" : "enable"
                 try {
                   await updateIdentityProvider(arcadia, i.id, { enabled: !i.enabled })
-                  setInfo(`${i.name} ${i.enabled ? "disabled" : "enabled"}.`)
-                  await refresh()
+                  await refreshIdps()
+                  toast.success(`${i.enabled ? "Disabled" : "Enabled"} ${i.name}`)
                 } catch (err) {
-                  setError(err instanceof ArcadiaError ? err.message : "Toggle failed.")
+                  toast.error(errorMessage(err, `${verb} ${i.name}`))
                 }
               },
             },
@@ -198,7 +220,7 @@ export default function SsoRoute() {
         },
       },
     ],
-    [arcadia, refresh],
+    [arcadia, refreshIdps, toast],
   )
 
   const idpTable = useTable<IdentityProvider>({
@@ -231,17 +253,6 @@ export default function SsoRoute() {
           </div>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Tabs defaultValue="idps">
           <TabsList>
             <TabsTrigger value="idps" data-action="sso-tab-idps">
@@ -255,48 +266,59 @@ export default function SsoRoute() {
           <TabsContent value="idps" className="pt-4">
             <Card>
               <CardContent className="relative p-0">
-                <LoadingOverlay active={loading && idps.length === 0} label="Loading IdPs…" />
-                {idpTable.total === 0 && !loading ? (
-                  <EmptyState
-                    icon={<KeyRound className="size-6" />}
-                    title="No identity providers."
-                    description="Connect a SAML IdP (Okta, Azure AD, Google Workspace, etc.) to enable SSO for this tenant."
-                    className="py-12"
+                <DataState
+                  loading={idpsLoading}
+                  error={idpsError}
+                  isEmpty={idpTable.total === 0}
+                  onRetry={refreshIdps}
+                  loadingLabel="Loading IdPs…"
+                  empty={
+                    <EmptyState
+                      icon={<KeyRound className="size-6" />}
+                      title="No identity providers."
+                      description="Connect a SAML IdP (Okta, Azure AD, Google Workspace, etc.) to enable SSO for this tenant."
+                      className="py-12"
+                    />
+                  }
+                >
+                  <DataTable
+                    columns={idpColumns}
+                    rows={idpTable.pageRows}
+                    getRowId={(i) => i.id}
+                    sort={idpTable.sort}
+                    onSortToggle={idpTable.toggleSort}
+                    loading={idpsLoading && idps.length > 0}
+                    stickyHeader
                   />
-                ) : (
-                  <>
-                    <DataTable
-                      columns={idpColumns}
-                      rows={idpTable.pageRows}
-                      getRowId={(i) => i.id}
-                      sort={idpTable.sort}
-                      onSortToggle={idpTable.toggleSort}
-                      loading={loading && idps.length > 0}
-                      stickyHeader
-                    />
-                    <Pagination
-                      page={idpTable.page}
-                      pageSize={idpTable.pageSize}
-                      total={idpTable.total}
-                      onPageChange={idpTable.setPage}
-                      onPageSizeChange={idpTable.setPageSize}
-                    />
-                  </>
-                )}
+                  <Pagination
+                    page={idpTable.page}
+                    pageSize={idpTable.pageSize}
+                    total={idpTable.total}
+                    onPageChange={idpTable.setPage}
+                    onPageSizeChange={idpTable.setPageSize}
+                  />
+                </DataState>
               </CardContent>
             </Card>
           </TabsContent>
 
           <TabsContent value="sessions" className="pt-4">
             <Card>
-              <CardContent className="p-0">
-                {sessions.length === 0 ? (
-                  <EmptyState
-                    title="No active SAML sessions."
-                    description="Sessions appear here once users authenticate via the IdP."
-                    className="py-12"
-                  />
-                ) : (
+              <CardContent className="relative p-0">
+                <DataState
+                  loading={sessionsLoading}
+                  error={sessionsError}
+                  isEmpty={sessions.length === 0}
+                  onRetry={refreshSessions}
+                  loadingLabel="Loading sessions…"
+                  empty={
+                    <EmptyState
+                      title="No active SAML sessions."
+                      description="Sessions appear here once users authenticate via the IdP."
+                      className="py-12"
+                    />
+                  }
+                >
                   <ul className="divide-y border-y">
                     {sessions.map((s) => (
                       <li
@@ -305,7 +327,7 @@ export default function SsoRoute() {
                       >
                         <div className="flex flex-col gap-0.5">
                           <span className="flex items-center gap-2">
-                            <code className="font-mono text-xs">{s.name_id ?? s.user_id}</code>
+                            <code className="font-mono text-xs">{sessionLabel(s)}</code>
                             {s.expires_at && new Date(s.expires_at).getTime() < Date.now() ? (
                               <Badge variant="destructive">expired</Badge>
                             ) : (
@@ -333,7 +355,7 @@ export default function SsoRoute() {
                       </li>
                     ))}
                   </ul>
-                )}
+                </DataState>
               </CardContent>
             </Card>
           </TabsContent>
@@ -346,21 +368,22 @@ export default function SsoRoute() {
         title="Delete identity provider?"
         description={
           pendingDelete
-            ? `${pendingDelete.name} will be removed. Existing SAML sessions remain valid until they expire.`
+            ? `Nobody can sign in through ${pendingDelete.name} once it's deleted, and its configuration — including the certificate — is gone for good. Existing SAML sessions stay valid until they expire. Disable it instead if this is temporary.`
             : ""
         }
         confirmLabel="Delete"
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const name = pendingDelete.name
           try {
             await deleteIdentityProvider(arcadia, pendingDelete.id)
             setPendingDelete(null)
-            setInfo("Identity provider deleted.")
             await refresh()
+            toast.success(`Deleted ${name}`)
           } catch (err) {
-            setError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete ${name}`))
           }
         }}
       />
@@ -371,21 +394,22 @@ export default function SsoRoute() {
         title="Destroy SAML session?"
         description={
           pendingSessionDestroy
-            ? `Session for ${pendingSessionDestroy.name_id ?? pendingSessionDestroy.user_id} will be revoked.`
+            ? `${sessionLabel(pendingSessionDestroy)} is signed out immediately and has to authenticate with the IdP again.`
             : ""
         }
         confirmLabel="Destroy"
         variant="danger"
         onConfirm={async () => {
           if (!pendingSessionDestroy) return
+          const who = sessionLabel(pendingSessionDestroy)
           try {
             await destroySamlSession(arcadia, pendingSessionDestroy.id)
             setPendingSessionDestroy(null)
-            setInfo("Session destroyed.")
-            await refresh()
+            await refreshSessions()
+            toast.success(`Destroyed the session for ${who}`)
           } catch (err) {
-            setError(err instanceof ArcadiaError ? err.message : "Destroy failed.")
             setPendingSessionDestroy(null)
+            toast.error(errorMessage(err, `destroy the session for ${who}`))
           }
         }}
       />
@@ -393,12 +417,11 @@ export default function SsoRoute() {
       <IdpEditorDialog
         state={editor}
         onClose={() => setEditor(null)}
-        onSaved={async (msg) => {
+        onSaved={async (message) => {
           setEditor(null)
-          if (msg) setInfo(msg)
-          await refresh()
+          await refreshIdps()
+          toast.success(message)
         }}
-        onError={setError}
       />
     </AppShell>
   )
@@ -408,12 +431,10 @@ function IdpEditorDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: Editor
   onClose: () => void
-  onSaved: (msg?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (message: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
@@ -431,9 +452,14 @@ function IdpEditorDialog({
   const [certificate, setCertificate] = useState("")
   const [attrJson, setAttrJson] = useState("{}")
   const [saving, setSaving] = useState(false)
+  // Inside the dialog, above the buttons — a page banner here would sit behind
+  // the scrim, and a rejected certificate would look like nothing happened.
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!open) return
+    setError(null)
+    setSaving(false)
     if (initial) {
       setName(initial.name)
       setEntityId(initial.entity_id)
@@ -460,7 +486,7 @@ function IdpEditorDialog({
   }, [open, initial])
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       let attribute_mapping: Record<string, string> = {}
@@ -484,20 +510,15 @@ function IdpEditorDialog({
 
       if (isEdit && initial) {
         await updateIdentityProvider(arcadia, initial.id, input)
-        await onSaved("Identity provider updated.")
+        await onSaved(`Saved ${name.trim()}`)
       } else {
         await createIdentityProvider(arcadia, input)
-        await onSaved("Identity provider created.")
+        await onSaved(`Created ${name.trim()}`)
       }
     } catch (err) {
-      onError(
-        err instanceof ArcadiaError
-          ? err.message
-          : err instanceof Error
-            ? err.message
-            : "Save failed.",
-      )
-    } finally {
+      // Keep the pasted certificate and JSON on screen — retyping them is the
+      // last thing an operator should have to do after a failed save.
+      setError(err)
       setSaving(false)
     }
   }
@@ -580,7 +601,7 @@ function IdpEditorDialog({
               id="idp-callback"
               value={callbackUrl}
               onChange={(e) => setCallbackUrl(e.target.value)}
-              placeholder="https://your-arcadia-app/api/v1/auth/saml/callback"
+              placeholder="https://your-arcadia-core/api/v1/auth/saml/callback"
               className="font-mono text-xs"
               data-action="idp-form-callback"
             />
@@ -636,8 +657,15 @@ function IdpEditorDialog({
           </div>
         </div>
 
+        {error ? (
+          <DialogError
+            error={error}
+            context={isEdit ? "save the identity provider" : "create the identity provider"}
+          />
+        ) : null}
+
         <DialogFooter>
-          <Button variant="outline" onClick={onClose} disabled={saving}>
+          <Button variant="outline" onClick={onClose} disabled={saving} data-action="idp-form-cancel">
             Cancel
           </Button>
           <Button
@@ -653,3 +681,5 @@ function IdpEditorDialog({
     </Dialog>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/status-page.tsx b/app/routes/status-page.tsx
index 583a2df..0ac841a 100644
--- a/app/routes/status-page.tsx
+++ b/app/routes/status-page.tsx
@@ -8,8 +8,9 @@ import {
   Trash2,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 import {
   IncidentTimeline,
   StatusBoard,
@@ -20,6 +21,8 @@ import {
 } from "@crema/status-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
 import {
@@ -103,26 +106,45 @@ export default function StatusPageRoute() {
   const [incidents, setIncidents] = useState<Incident[]>([])
   const [subscribers, setSubscribers] = useState<Subscriber[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // Three independent endpoints, three independent errors. These used to be
+  // `.catch(() => [])` — every failure silently became an empty list, so a
+  // broken incidents endpoint rendered as the reassuring "No incidents. No
+  // drama is the right state." One failing tab must not blank the other two.
+  const [componentsError, setComponentsError] = useState<unknown>(null)
+  const [incidentsError, setIncidentsError] = useState<unknown>(null)
+  const [subscribersError, setSubscribersError] = useState<unknown>(null)
 
   const refresh = useCallback(async () => {
-    setError(null)
     setLoading(true)
-    try {
-      const [c, i, s] = await Promise.all([
-        listComponents(arcadia).catch(() => [] as StatusComponent[]),
-        listIncidents(arcadia).catch(() => [] as Incident[]),
-        listSubscribers(arcadia).catch(() => [] as Subscriber[]),
-      ])
-      setComponents(c)
-      setIncidents(i)
-      setSubscribers(s)
-    } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load status page.")
-    } finally {
-      setLoading(false)
+    setComponentsError(null)
+    setIncidentsError(null)
+    setSubscribersError(null)
+
+    const [c, i, s] = await Promise.allSettled([
+      listComponents(arcadia),
+      listIncidents(arcadia),
+      listSubscribers(arcadia),
+    ])
+
+    if (c.status === "fulfilled") setComponents(c.value)
+    else {
+      setComponents([])
+      setComponentsError(c.reason)
     }
+
+    if (i.status === "fulfilled") setIncidents(i.value)
+    else {
+      setIncidents([])
+      setIncidentsError(i.reason)
+    }
+
+    if (s.status === "fulfilled") setSubscribers(s.value)
+    else {
+      setSubscribers([])
+      setSubscribersError(s.reason)
+    }
+
+    setLoading(false)
   }, [arcadia])
 
   useEffect(() => {
@@ -193,17 +215,6 @@ export default function StatusPageRoute() {
           </Button>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         {/* Live preview using the public-facing widget */}
         {uiComponents.length > 0 ? (
           <Card>
@@ -242,9 +253,8 @@ export default function StatusPageRoute() {
             <ComponentsPanel
               components={components}
               loading={loading}
+              error={componentsError}
               onChanged={refresh}
-              onError={setError}
-              onInfo={setInfo}
             />
           </TabsContent>
 
@@ -253,14 +263,18 @@ export default function StatusPageRoute() {
               incidents={incidents}
               components={components}
               loading={loading}
+              error={incidentsError}
               onChanged={refresh}
-              onError={setError}
-              onInfo={setInfo}
             />
           </TabsContent>
 
           <TabsContent value="subscribers" className="pt-4">
-            <SubscribersPanel subscribers={subscribers} loading={loading} />
+            <SubscribersPanel
+              subscribers={subscribers}
+              loading={loading}
+              error={subscribersError}
+              onRetry={refresh}
+            />
           </TabsContent>
         </Tabs>
       </div>
@@ -296,17 +310,16 @@ function impactToSeverity(i: IncidentImpact): Severity {
 function ComponentsPanel({
   components,
   loading,
+  error,
   onChanged,
-  onError,
-  onInfo,
 }: {
   components: StatusComponent[]
   loading: boolean
+  error: unknown
   onChanged: () => Promise<void>
-  onError: (msg: string | null) => void
-  onInfo: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const [editor, setEditor] = useState<ComponentEditor>(null)
   const [pendingDelete, setPendingDelete] = useState<StatusComponent | null>(null)
 
@@ -323,13 +336,20 @@ function ComponentsPanel({
         </Button>
       </CardHeader>
       <CardContent className="relative p-0">
-        <LoadingOverlay
-          active={loading && components.length === 0}
-          label="Loading components…"
-        />
-        {components.length === 0 && !loading ? (
-          <EmptyState title="No components yet." description="Add the first one to seed the public board." className="py-8" />
-        ) : (
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={components.length === 0}
+          onRetry={onChanged}
+          loadingLabel="Loading components…"
+          empty={
+            <EmptyState
+              title="No components yet."
+              description="Add the first one to seed the public board."
+              className="py-8"
+            />
+          }
+        >
           <ul className="divide-y border-y">
             {components.map((c) => (
               <li
@@ -371,7 +391,7 @@ function ComponentsPanel({
               </li>
             ))}
           </ul>
-        )}
+        </DataState>
       </CardContent>
 
       <ComponentEditorDialog
@@ -379,10 +399,9 @@ function ComponentsPanel({
         onClose={() => setEditor(null)}
         onSaved={async (msg) => {
           setEditor(null)
-          if (msg) onInfo(msg)
           await onChanged()
+          toast.success(msg)
         }}
-        onError={onError}
       />
 
       <ConfirmDialog
@@ -398,14 +417,15 @@ function ComponentsPanel({
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const name = pendingDelete.name
           try {
             await deleteComponent(arcadia, pendingDelete.id)
             setPendingDelete(null)
-            onInfo("Component deleted.")
             await onChanged()
+            toast.success(`Deleted ${name}`)
           } catch (err) {
-            onError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete ${name}`))
           }
         }}
       />
@@ -424,12 +444,10 @@ function ComponentEditorDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: ComponentEditor
   onClose: () => void
-  onSaved: (msg?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (msg: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
@@ -442,6 +460,11 @@ function ComponentEditorDialog({
   const [groupName, setGroupName] = useState("")
   const [displayOrder, setDisplayOrder] = useState("0")
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
+
+  useEffect(() => {
+    if (!open) setError(null)
+  }, [open])
 
   useEffect(() => {
     if (!open) return
@@ -461,7 +484,7 @@ function ComponentEditorDialog({
   }, [open, initial])
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       const input: ComponentInput = {
@@ -473,13 +496,13 @@ function ComponentEditorDialog({
       }
       if (isEdit && initial) {
         await updateComponent(arcadia, initial.id, input)
-        await onSaved("Component updated.")
+        await onSaved(`Updated ${name}`)
       } else {
         await createComponent(arcadia, input)
-        await onSaved("Component created.")
+        await onSaved(`Created ${name}`)
       }
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Save failed.")
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -547,8 +570,21 @@ function ComponentEditorDialog({
             />
           </div>
         </div>
+
+        {error ? (
+          <DialogError
+            error={error}
+            context={isEdit ? "save the component" : "create the component"}
+          />
+        ) : null}
+
         <DialogFooter>
-          <Button variant="outline" onClick={onClose} disabled={saving}>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            disabled={saving}
+            data-action="status-component-form-cancel"
+          >
             Cancel
           </Button>
           <Button onClick={submit} disabled={saving || !name} data-action="status-component-form-save">
@@ -567,18 +603,17 @@ function IncidentsPanel({
   incidents,
   components,
   loading,
+  error,
   onChanged,
-  onError,
-  onInfo,
 }: {
   incidents: Incident[]
   components: StatusComponent[]
   loading: boolean
+  error: unknown
   onChanged: () => Promise<void>
-  onError: (msg: string | null) => void
-  onInfo: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const [editor, setEditor] = useState<IncidentEditor>(null)
 
   return (
@@ -594,15 +629,24 @@ function IncidentsPanel({
         </Button>
       </CardHeader>
       <CardContent className="relative p-0">
-        <LoadingOverlay active={loading && incidents.length === 0} label="Loading incidents…" />
-        {incidents.length === 0 && !loading ? (
-          <EmptyState
-            icon={<AlertTriangle className="size-6" />}
-            title="No incidents."
-            description="No drama is the right state."
-            className="py-8"
-          />
-        ) : (
+        {/* "No drama is the right state" is a lovely thing to say — and a
+            dangerous thing to say when the endpoint just 500'd. DataState makes
+            sure it's only ever said about a load that actually succeeded. */}
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={incidents.length === 0}
+          onRetry={onChanged}
+          loadingLabel="Loading incidents…"
+          empty={
+            <EmptyState
+              icon={<AlertTriangle className="size-6" />}
+              title="No incidents."
+              description="No drama is the right state."
+              className="py-8"
+            />
+          }
+        >
           <ul className="flex flex-col divide-y border-y">
             {incidents.map((i) => (
               <li key={i.id} className="flex flex-col gap-2 px-3 py-3 text-sm">
@@ -639,12 +683,10 @@ function IncidentsPanel({
                         onClick={async () => {
                           try {
                             await resolveIncident(arcadia, i.id)
-                            onInfo("Incident resolved.")
                             await onChanged()
+                            toast.success(`Resolved "${i.title}"`)
                           } catch (err) {
-                            onError(
-                              err instanceof ArcadiaError ? err.message : "Resolve failed.",
-                            )
+                            toast.error(errorMessage(err, `resolve "${i.title}"`))
                           }
                         }}
                         data-action={`status-incident-${i.id}-resolve`}
@@ -683,7 +725,7 @@ function IncidentsPanel({
               </li>
             ))}
           </ul>
-        )}
+        </DataState>
       </CardContent>
 
       <IncidentEditorDialog
@@ -692,10 +734,9 @@ function IncidentsPanel({
         onClose={() => setEditor(null)}
         onSaved={async (msg) => {
           setEditor(null)
-          if (msg) onInfo(msg)
           await onChanged()
+          toast.success(msg)
         }}
-        onError={onError}
       />
     </Card>
   )
@@ -714,13 +755,11 @@ function IncidentEditorDialog({
   components,
   onClose,
   onSaved,
-  onError,
 }: {
   state: IncidentEditor
   components: StatusComponent[]
   onClose: () => void
-  onSaved: (msg?: string) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (msg: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
@@ -730,8 +769,7 @@ function IncidentEditorDialog({
       <PostUpdateDialog
         incident={state.incident}
         onClose={onClose}
-        onSaved={() => onSaved("Update posted.")}
-        onError={onError}
+        onSaved={() => onSaved(`Posted an update on "${state.incident.title}"`)}
       />
     )
   }
@@ -744,6 +782,11 @@ function IncidentEditorDialog({
   const [impact, setImpact] = useState<IncidentImpact>("minor")
   const [componentIds, setComponentIds] = useState<Set<string>>(new Set())
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
+
+  useEffect(() => {
+    if (!open) setError(null)
+  }, [open])
 
   useEffect(() => {
     if (!open) return
@@ -761,7 +804,7 @@ function IncidentEditorDialog({
   }, [open, initial])
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       const input: IncidentInput = {
@@ -772,13 +815,13 @@ function IncidentEditorDialog({
       }
       if (isEdit && initial) {
         await updateIncident(arcadia, initial.id, input)
-        await onSaved("Incident updated.")
+        await onSaved(`Updated "${title}"`)
       } else {
         await createIncident(arcadia, input)
-        await onSaved("Incident opened.")
+        await onSaved(`Opened incident "${title}"`)
       }
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Save failed.")
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -871,8 +914,21 @@ function IncidentEditorDialog({
             )}
           </div>
         </div>
+
+        {error ? (
+          <DialogError
+            error={error}
+            context={isEdit ? "save the incident" : "open the incident"}
+          />
+        ) : null}
+
         <DialogFooter>
-          <Button variant="outline" onClick={onClose} disabled={saving}>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            disabled={saving}
+            data-action="status-incident-form-cancel"
+          >
             Cancel
           </Button>
           <Button
@@ -893,26 +949,26 @@ function PostUpdateDialog({
   incident,
   onClose,
   onSaved,
-  onError,
 }: {
   incident: Incident
   onClose: () => void
   onSaved: () => Promise<void>
-  onError: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
   const [status, setStatus] = useState<IncidentStatus>(incident.status)
   const [body, setBody] = useState("")
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       await addIncidentUpdate(arcadia, incident.id, { status, body })
       await onSaved()
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : "Post failed.")
+      // The body the operator just wrote stays in the textarea.
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -955,8 +1011,16 @@ function PostUpdateDialog({
             />
           </div>
         </div>
+
+        {error ? <DialogError error={error} context="post the update" /> : null}
+
         <DialogFooter>
-          <Button variant="outline" onClick={onClose} disabled={saving}>
+          <Button
+            variant="outline"
+            onClick={onClose}
+            disabled={saving}
+            data-action="status-incident-update-cancel"
+          >
             Cancel
           </Button>
           <Button onClick={submit} disabled={saving || !body} data-action="status-incident-update-save">
@@ -974,30 +1038,32 @@ function PostUpdateDialog({
 function SubscribersPanel({
   subscribers,
   loading,
+  error,
+  onRetry,
 }: {
   subscribers: Subscriber[]
   loading: boolean
+  error: unknown
+  onRetry: () => void
 }) {
-  if (loading && subscribers.length === 0) {
-    return (
-      <Card>
-        <CardContent className="relative py-8">
-          <LoadingOverlay active label="Loading subscribers…" />
-        </CardContent>
-      </Card>
-    )
-  }
   return (
     <Card>
       <CardContent className="p-0">
-        {subscribers.length === 0 ? (
-          <EmptyState
-            icon={<Mail className="size-6" />}
-            title="No subscribers yet."
-            description="They appear here once they confirm via the public status page."
-            className="py-8"
-          />
-        ) : (
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={subscribers.length === 0}
+          onRetry={onRetry}
+          loadingLabel="Loading subscribers…"
+          empty={
+            <EmptyState
+              icon={<Mail className="size-6" />}
+              title="No subscribers yet."
+              description="They appear here once they confirm via the public status page."
+              className="py-8"
+            />
+          }
+        >
           <ul className="divide-y border-y">
             {subscribers.map((s) => (
               <li
@@ -1020,8 +1086,10 @@ function SubscribersPanel({
               </li>
             ))}
           </ul>
-        )}
+        </DataState>
       </CardContent>
     </Card>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/storage.tsx b/app/routes/storage.tsx
index 7eae9bb..fbf6fda 100644
--- a/app/routes/storage.tsx
+++ b/app/routes/storage.tsx
@@ -12,7 +12,8 @@ import {
   Wrench,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -25,9 +26,11 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Button } from "~/components/ui/button"
 import {
   Card,
@@ -90,14 +93,27 @@ type EditorState =
   | { mode: "edit"; config: StorageConfig }
   | null
 
+const ACTION_PAST_TENSE: Record<
+  Exclude<NonNullable<PendingAction>["kind"], never>,
+  string
+> = {
+  deactivate: "Deactivated",
+  degraded: "Marked degraded",
+  maintenance: "Marked in maintenance",
+  delete: "Deleted",
+}
+
 export default function StorageRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
   const [configs, setConfigs] = useState<StorageConfig[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // The raw thrown value — `DataState` normalises it into plain language. A
+  // 500 here used to render "Internal Server Error" *and* "No storage configs
+  // yet." side by side, which reads as an empty deployment.
+  const [error, setError] = useState<unknown>(null)
   const [pending, setPending] = useState<PendingAction>(null)
   const [editor, setEditor] = useState<EditorState>(null)
   const [search, setSearch] = useState("")
@@ -109,7 +125,7 @@ export default function StorageRoute() {
       const list = await listStorageConfigs(arcadia)
       setConfigs(list)
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load storage configs.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -131,30 +147,35 @@ export default function StorageRoute() {
         else if (action.kind === "delete") await deleteStorageConfig(arcadia, action.config.id)
         setPending(null)
         await refresh()
+        toast.success(`${ACTION_PAST_TENSE[action.kind]} ${action.config.name}`)
       } catch (err) {
-        setError(err instanceof ArcadiaError ? err.message : "Action failed.")
         setPending(null)
+        toast.error(errorMessage(err, `${action.kind} ${action.config.name}`))
       }
     },
-    [arcadia, refresh],
+    [arcadia, refresh, toast],
   )
 
   const validate = useCallback(
     async (config: StorageConfig) => {
-      setError(null)
-      setInfo(null)
       try {
         const result = await validateStorageConfig(arcadia, config.id)
         if (result?.ok) {
-          setInfo(`${config.name}: validation passed.`)
+          toast.success(`${config.name} validated`, {
+            description: "The backend answered with the credentials on file.",
+          })
         } else {
-          setError(`${config.name}: ${result?.message ?? "validation failed."}`)
+          // The call succeeded; the *credentials* didn't. That's not a load
+          // failure, so it belongs in a toast, not the table's error slot.
+          toast.error(`${config.name} failed validation`, {
+            description: result?.message ?? undefined,
+          })
         }
       } catch (err) {
-        setError(err instanceof ArcadiaError ? err.message : "Validation failed.")
+        toast.error(errorMessage(err, `validate ${config.name}`))
       }
     },
-    [arcadia],
+    [arcadia, toast],
   )
 
   const columns = useMemo<Column<StorageConfig>[]>(
@@ -216,7 +237,7 @@ export default function StorageRoute() {
               refresh,
               setPending,
               setEditor,
-              setError,
+              toast,
               validate,
             })}
             triggerDataAction={`storage-${slugify(c.name)}-actions`}
@@ -224,7 +245,7 @@ export default function StorageRoute() {
         ),
       },
     ],
-    [arcadia, refresh, validate],
+    [arcadia, refresh, toast, validate],
   )
 
   const summary = useMemo(
@@ -295,17 +316,6 @@ export default function StorageRoute() {
           </div>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Card>
           <CardHeader className="flex flex-row items-center justify-between gap-4">
             <SearchInput
@@ -321,37 +331,41 @@ export default function StorageRoute() {
           </CardHeader>
 
           <CardContent className="relative p-0">
-            <LoadingOverlay active={loading && configs.length === 0} label="Loading storage configs…" />
-            {table.total === 0 && !loading ? (
-              <EmptyState
-                title={search ? "No configs match that search." : "No storage configs yet."}
-                description={
-                  search
-                    ? "Try a different name, backend, or status."
-                    : "Create your first storage config to start uploading objects."
-                }
-                className="py-12"
+            <DataState
+              loading={loading}
+              error={error}
+              isEmpty={table.total === 0}
+              onRetry={refresh}
+              loadingLabel="Loading storage configs…"
+              empty={
+                <EmptyState
+                  title={search ? "No configs match that search." : "No storage configs yet."}
+                  description={
+                    search
+                      ? "Try a different name, backend, or status."
+                      : "Create your first storage config to start uploading objects."
+                  }
+                  className="py-12"
+                />
+              }
+            >
+              <DataTable
+                columns={columns}
+                rows={table.pageRows}
+                getRowId={(c) => c.id}
+                sort={table.sort}
+                onSortToggle={table.toggleSort}
+                loading={loading && configs.length > 0}
+                stickyHeader
               />
-            ) : (
-              <>
-                <DataTable
-                  columns={columns}
-                  rows={table.pageRows}
-                  getRowId={(c) => c.id}
-                  sort={table.sort}
-                  onSortToggle={table.toggleSort}
-                  loading={loading && configs.length > 0}
-                  stickyHeader
-                />
-                <Pagination
-                  page={table.page}
-                  pageSize={table.pageSize}
-                  total={table.total}
-                  onPageChange={table.setPage}
-                  onPageSizeChange={table.setPageSize}
-                />
-              </>
-            )}
+              <Pagination
+                page={table.page}
+                pageSize={table.pageSize}
+                total={table.total}
+                onPageChange={table.setPage}
+                onPageSizeChange={table.setPageSize}
+              />
+            </DataState>
           </CardContent>
         </Card>
       </div>
@@ -412,11 +426,11 @@ export default function StorageRoute() {
       <StorageEditorDialog
         state={editor}
         onClose={() => setEditor(null)}
-        onSaved={async () => {
+        onSaved={async (name, wasEdit) => {
           setEditor(null)
           await refresh()
+          toast.success(wasEdit ? `Saved ${name}` : `Created ${name}`)
         }}
-        onError={setError}
       />
     </AppShell>
   )
@@ -437,11 +451,11 @@ function rowActions(
     refresh: () => Promise<void>
     setPending: (p: PendingAction) => void
     setEditor: (s: EditorState) => void
-    setError: (msg: string | null) => void
+    toast: ReturnType<typeof useToast>
     validate: (c: StorageConfig) => Promise<void>
   },
 ): ActionItem[] {
-  const { arcadia, refresh, setPending, setEditor, setError, validate } = ctx
+  const { arcadia, refresh, setPending, setEditor, toast, validate } = ctx
   const slug = slugify(c.name)
   const items: ActionItem[] = []
 
@@ -478,8 +492,9 @@ function rowActions(
         try {
           await activateStorageConfig(arcadia, c.id)
           await refresh()
+          toast.success(`Activated ${c.name}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Activate failed.")
+          toast.error(errorMessage(err, `activate ${c.name}`))
         }
       },
     })
@@ -495,8 +510,9 @@ function rowActions(
         try {
           await setDefaultStorageConfig(arcadia, c.id)
           await refresh()
+          toast.success(`${c.name} is now the default backend`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Set default failed.")
+          toast.error(errorMessage(err, `set ${c.name} as the default backend`))
         }
       },
     })
@@ -533,17 +549,18 @@ function StorageEditorDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: EditorState
   onClose: () => void
-  onSaved: () => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (name: string, wasEdit: boolean) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
   const isEdit = state?.mode === "edit"
   const initial = isEdit ? state.config : null
+  // Errors belong to the dialog, not the page: a page-level banner renders
+  // behind the modal scrim, where nobody reads it.
+  const [error, setError] = useState<unknown>(null)
 
   const [name, setName] = useState("")
   const [backend, setBackend] = useState<StorageBackend>("s3")
@@ -556,7 +573,11 @@ function StorageEditorDialog({
 
   // Reset form whenever the dialog opens / target changes.
   useEffect(() => {
-    if (!open) return
+    if (!open) {
+      setError(null)
+      return
+    }
+    setError(null)
     if (initial) {
       setName(initial.name)
       setBackend(initial.backend_type)
@@ -595,7 +616,7 @@ function StorageEditorDialog({
   }
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       const config: Record<string, unknown> = {}
@@ -633,9 +654,11 @@ function StorageEditorDialog({
       } else {
         await createStorageConfig(arcadia, input)
       }
-      await onSaved()
+      await onSaved(name, isEdit)
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : err instanceof Error ? err.message : "Save failed.")
+      // Keep the dialog open with the form intact — including any secret the
+      // operator just pasted — so they can fix and resubmit.
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -749,6 +772,13 @@ function StorageEditorDialog({
           </div>
         </div>
 
+        {error ? (
+          <DialogError
+            error={error}
+            context={isEdit ? "save the storage config" : "create the storage config"}
+          />
+        ) : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} disabled={saving} data-action="storage-form-cancel">
             Cancel
@@ -841,3 +871,5 @@ function formatBytes(n: number | null): string {
   }
   return `${v < 10 ? v.toFixed(1) : Math.round(v)} ${units[i]}`
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/tenants.$id.tsx b/app/routes/tenants.$id.tsx
new file mode 100644
index 0000000..8e723d9
--- /dev/null
+++ b/app/routes/tenants.$id.tsx
@@ -0,0 +1,375 @@
+import { useCallback, useEffect, useMemo, useState } from "react"
+import { Link, useNavigate, useParams } from "react-router"
+import { ArrowLeft, Pause, Play, RefreshCw } from "lucide-react"
+
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { BadgeCell, type BadgeTone } from "@crema/table-ui"
+import { ConfirmDialog } from "@crema/feedback-ui"
+import { useToast } from "@crema/notification-ui"
+import { useRegisterContext } from "@crema/aifirst-ui/context"
+
+import { AppShell } from "~/components/layout/app-shell"
+import { PageHeader } from "~/components/layout/page-header"
+import { DataState } from "~/components/data-state"
+import { TenantSection, Field } from "~/components/tenant-detail/section"
+import { Button } from "~/components/ui/button"
+import { Input } from "~/components/ui/input"
+import { Tabs, TabsContent, TabsList, TabsTrigger } from "~/components/ui/tabs"
+import {
+  activateTenant,
+  deactivateTenant,
+  getTenant,
+  suspendTenant,
+  updateTenant,
+  type Tenant,
+  type TenantStatus,
+} from "~/lib/arcadia/tenants"
+import { errorMessage } from "~/lib/errors"
+import { pageTitle } from "~/lib/page-meta"
+import { useSession } from "~/lib/session"
+
+// The eight tabs. Each is its own component so the file stays legible and the
+// tabs can evolve independently; they share the TenantSection frame and take
+// the loaded tenant + a `reload` callback.
+import { PlanTab } from "~/components/tenant-detail/plan-tab"
+import { BrandingTab } from "~/components/tenant-detail/branding-tab"
+import { LocalizationTab } from "~/components/tenant-detail/localization-tab"
+import { DeliveryTab } from "~/components/tenant-detail/delivery-tab"
+import { FeatureFlagsTab } from "~/components/tenant-detail/feature-flags-tab"
+import { IpRulesTab } from "~/components/tenant-detail/ip-rules-tab"
+import { InboundWebhooksTab } from "~/components/tenant-detail/inbound-webhooks-tab"
+
+export const meta = () => pageTitle("Tenant")
+
+export type TenantTabProps = {
+  tenant: Tenant
+  /** Re-fetch the tenant after a mutation that changes the header fields. */
+  reload: () => Promise<void>
+}
+
+type PendingAction = { kind: "suspend" | "deactivate" } | null
+
+const TABS = [
+  { value: "overview", label: "Overview" },
+  { value: "plan", label: "Plan & quotas" },
+  { value: "branding", label: "Branding" },
+  { value: "localization", label: "Localization" },
+  { value: "delivery", label: "Email & SMS" },
+  { value: "flags", label: "Feature flags" },
+  { value: "ip-rules", label: "IP rules" },
+  { value: "webhooks", label: "Inbound webhooks" },
+]
+
+export default function TenantDetailRoute() {
+  const { id = "" } = useParams()
+  const session = useSession()
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+  const navigate = useNavigate()
+
+  const [tenant, setTenant] = useState<Tenant | null>(null)
+  const [loading, setLoading] = useState(true)
+  const [error, setError] = useState<unknown>(null)
+  const [tab, setTab] = useState("overview")
+  const [pending, setPending] = useState<PendingAction>(null)
+
+  const reload = useCallback(async () => {
+    setError(null)
+    setLoading(true)
+    try {
+      setTenant(await getTenant(arcadia, id))
+    } catch (err) {
+      setError(err)
+    } finally {
+      setLoading(false)
+    }
+  }, [arcadia, id])
+
+  useEffect(() => {
+    if (session && id) reload()
+  }, [session, id, reload])
+
+  useRegisterContext(
+    "tenantDetail",
+    useMemo(
+      () => ({
+        loaded: !!tenant,
+        id: tenant?.id ?? id,
+        slug: tenant?.slug ?? null,
+        name: tenant?.name ?? null,
+        status: tenant?.status ?? null,
+        plan: tenant?.plan?.name ?? null,
+        activeTab: tab,
+      }),
+      [tenant, tab, id],
+    ),
+  )
+
+  const runLifecycle = useCallback(
+    async (action: PendingAction) => {
+      if (!action || !tenant) return
+      const verb = action.kind === "suspend" ? "Suspended" : "Deactivated"
+      try {
+        if (action.kind === "suspend") await suspendTenant(arcadia, tenant.id)
+        else await deactivateTenant(arcadia, tenant.id)
+        setPending(null)
+        await reload()
+        toast.success(`${verb} ${tenant.name}`)
+      } catch (err) {
+        setPending(null)
+        toast.error(errorMessage(err, `${action.kind} ${tenant.name}`))
+      }
+    },
+    [arcadia, tenant, reload, toast],
+  )
+
+  const activate = useCallback(async () => {
+    if (!tenant) return
+    try {
+      await activateTenant(arcadia, tenant.id)
+      await reload()
+      toast.success(`Activated ${tenant.name}`)
+    } catch (err) {
+      toast.error(errorMessage(err, `activate ${tenant.name}`))
+    }
+  }, [arcadia, tenant, reload, toast])
+
+  return (
+    <AppShell>
+      <PageHeader
+        title={
+          <span className="flex items-center gap-3">
+            <Button
+              variant="ghost"
+              size="icon-sm"
+              onClick={() => navigate("/tenants")}
+              aria-label="Back to tenants"
+              data-action="tenant-detail-back"
+            >
+              <ArrowLeft className="size-4" />
+            </Button>
+            {tenant?.name ?? "Tenant"}
+          </span>
+        }
+        badges={
+          tenant ? (
+            <>
+              <code className="rounded bg-muted px-1.5 py-0.5 font-mono text-xs">
+                {tenant.slug}
+              </code>
+              <BadgeCell label={tenant.status} tone={statusTone(tenant.status)} />
+            </>
+          ) : null
+        }
+        description={
+          <Link to="/tenants" className="inline-flex items-center gap-1 hover:underline">
+            <ArrowLeft className="size-3" /> All tenants
+          </Link>
+        }
+        actions={
+          tenant ? (
+            <>
+              <Button
+                variant="outline"
+                size="sm"
+                onClick={reload}
+                disabled={loading}
+                data-action="tenant-detail-refresh"
+              >
+                <RefreshCw className={`size-4 ${loading ? "animate-spin" : ""}`} />
+                Refresh
+              </Button>
+              {tenant.status === "active" ? (
+                <Button
+                  variant="outline"
+                  size="sm"
+                  onClick={() => setPending({ kind: "suspend" })}
+                  data-action="tenant-detail-suspend"
+                >
+                  <Pause className="size-4" />
+                  Suspend
+                </Button>
+              ) : (
+                <Button
+                  variant="outline"
+                  size="sm"
+                  onClick={activate}
+                  data-action="tenant-detail-activate"
+                >
+                  <Play className="size-4" />
+                  Activate
+                </Button>
+              )}
+              <Button
+                variant="outline"
+                size="sm"
+                className="text-destructive"
+                onClick={() => setPending({ kind: "deactivate" })}
+                data-action="tenant-detail-deactivate"
+              >
+                Deactivate
+              </Button>
+            </>
+          ) : null
+        }
+      />
+
+      <DataState
+        loading={loading}
+        error={error}
+        isEmpty={!tenant}
+        onRetry={reload}
+        loadingLabel="Loading tenant…"
+        empty={<div className="py-12 text-center text-muted-foreground">Tenant not found.</div>}
+      >
+        {tenant ? (
+          <Tabs value={tab} onValueChange={setTab}>
+            <div className="overflow-x-auto">
+              <TabsList>
+                {TABS.map((t) => (
+                  <TabsTrigger
+                    key={t.value}
+                    value={t.value}
+                    data-action={`tenant-detail-tab-${t.value}`}
+                  >
+                    {t.label}
+                  </TabsTrigger>
+                ))}
+              </TabsList>
+            </div>
+
+            <TabsContent value="overview">
+              <OverviewTab tenant={tenant} reload={reload} />
+            </TabsContent>
+            <TabsContent value="plan">
+              <PlanTab tenant={tenant} reload={reload} />
+            </TabsContent>
+            <TabsContent value="branding">
+              <BrandingTab tenant={tenant} reload={reload} />
+            </TabsContent>
+            <TabsContent value="localization">
+              <LocalizationTab tenant={tenant} reload={reload} />
+            </TabsContent>
+            <TabsContent value="delivery">
+              <DeliveryTab tenant={tenant} reload={reload} />
+            </TabsContent>
+            <TabsContent value="flags">
+              <FeatureFlagsTab tenant={tenant} reload={reload} />
+            </TabsContent>
+            <TabsContent value="ip-rules">
+              <IpRulesTab tenant={tenant} reload={reload} />
+            </TabsContent>
+            <TabsContent value="webhooks">
+              <InboundWebhooksTab tenant={tenant} reload={reload} />
+            </TabsContent>
+          </Tabs>
+        ) : null}
+      </DataState>
+
+      <ConfirmDialog
+        open={pending?.kind === "suspend"}
+        onOpenChange={(o) => !o && setPending(null)}
+        title="Suspend tenant?"
+        description={
+          tenant
+            ? `${tenant.name} will be suspended. Members won't be able to sign in until you reactivate.`
+            : ""
+        }
+        confirmLabel="Suspend"
+        variant="default"
+        onConfirm={() => runLifecycle(pending)}
+      />
+      <ConfirmDialog
+        open={pending?.kind === "deactivate"}
+        onOpenChange={(o) => !o && setPending(null)}
+        title="Deactivate tenant?"
+        description={
+          tenant
+            ? `${tenant.name} will be taken offline: nobody can sign in and its apps stop serving. Its data is kept, and you can reactivate it from here. Suspend instead if this is temporary.`
+            : ""
+        }
+        confirmLabel="Deactivate"
+        variant="danger"
+        onConfirm={() => runLifecycle(pending)}
+      />
+    </AppShell>
+  )
+}
+
+function statusTone(status: TenantStatus): BadgeTone {
+  if (status === "active") return "success"
+  if (status === "suspended") return "warning"
+  if (status === "deactivated") return "danger"
+  return "default"
+}
+
+// --- Overview tab (reference implementation for the other seven) ---
+
+function OverviewTab({ tenant, reload }: TenantTabProps) {
+  const arcadia = useArcadiaClient()
+  const toast = useToast()
+  const [name, setName] = useState(tenant.name)
+  const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
+
+  const dirty = name.trim() !== tenant.name && name.trim().length > 0
+
+  const save = async () => {
+    setSaving(true)
+    setError(null)
+    try {
+      await updateTenant(arcadia, tenant.id, { name: name.trim() })
+      await reload()
+      toast.success("Tenant name updated")
+    } catch (err) {
+      setError(err)
+    } finally {
+      setSaving(false)
+    }
+  }
+
+  return (
+    <div className="flex flex-col gap-6">
+      <TenantSection
+        title="Identity"
+        description="The tenant's display name. The slug is fixed once created — it's baked into URLs and the X-Tenant-ID header."
+        onSubmit={save}
+        saving={saving}
+        error={error}
+        errorContext="rename the tenant"
+        dirty={dirty}
+        dataAction="tenant-detail-overview-save"
+      >
+        <Field label="Name" htmlFor="tenant-name">
+          <Input
+            id="tenant-name"
+            value={name}
+            onChange={(e) => setName(e.target.value)}
+            data-action="tenant-detail-overview-name"
+          />
+        </Field>
+        <Field label="Slug">
+          <Input value={tenant.slug} readOnly disabled className="font-mono" />
+        </Field>
+      </TenantSection>
+
+      <div className="grid gap-3 sm:grid-cols-2">
+        <FactCard label="Status" value={tenant.status} />
+        <FactCard label="Plan" value={tenant.plan?.name ?? "—"} />
+        <FactCard label="Created" value={new Date(tenant.inserted_at).toLocaleString()} />
+        <FactCard label="Last updated" value={new Date(tenant.updated_at).toLocaleString()} />
+      </div>
+    </div>
+  )
+}
+
+function FactCard({ label, value }: { label: string; value: string }) {
+  return (
+    <div className="rounded-lg border bg-card/40 px-4 py-3">
+      <div className="text-xs uppercase tracking-wider text-muted-foreground">{label}</div>
+      <div className="mt-0.5 font-medium capitalize">{value}</div>
+    </div>
+  )
+}
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/tenants.tsx b/app/routes/tenants.tsx
index f203945..2c176d1 100644
--- a/app/routes/tenants.tsx
+++ b/app/routes/tenants.tsx
@@ -1,7 +1,9 @@
 import { useCallback, useEffect, useMemo, useState, type FormEvent } from "react"
-import { Pause, Play, Plus, RefreshCw } from "lucide-react"
+import { Link, useNavigate } from "react-router"
+import { Pause, Play, Plus, RefreshCw, Settings2 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -14,10 +16,12 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
 import { PageHeader } from "~/components/layout/page-header"
+import { errorMessage } from "~/lib/errors"
 import { Button } from "~/components/ui/button"
 import {
   Card,
@@ -59,10 +63,14 @@ type PendingAction = {
 export default function TenantsRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
+  const navigate = useNavigate()
 
   const [tenants, setTenants] = useState<Tenant[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
+  // The raw thrown value — `DataState` normalises it into plain language. We
+  // deliberately don't stringify here; the status code carries the meaning.
+  const [error, setError] = useState<unknown>(null)
   const [pending, setPending] = useState<PendingAction>(null)
   const [search, setSearch] = useState("")
   const [createOpen, setCreateOpen] = useState(false)
@@ -74,7 +82,7 @@ export default function TenantsRoute() {
       const list = await listTenants(arcadia)
       setTenants(list)
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load tenants.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -87,17 +95,19 @@ export default function TenantsRoute() {
   const runAction = useCallback(
     async (action: PendingAction) => {
       if (!action) return
+      const verb = action.kind === "suspend" ? "Suspended" : "Deactivated"
       try {
         if (action.kind === "suspend") await suspendTenant(arcadia, action.tenant.id)
         else await deactivateTenant(arcadia, action.tenant.id)
         setPending(null)
         await refresh()
+        toast.success(`${verb} ${action.tenant.name}`)
       } catch (err) {
-        setError(err instanceof ArcadiaError ? err.message : "Action failed.")
         setPending(null)
+        toast.error(errorMessage(err, `${action.kind} ${action.tenant.name}`))
       }
     },
-    [arcadia, refresh],
+    [arcadia, refresh, toast],
   )
 
   const columns = useMemo<Column<Tenant>[]>(
@@ -107,7 +117,15 @@ export default function TenantsRoute() {
         header: "Name",
         accessor: "name",
         sortable: true,
-        cell: (t) => <span className="font-medium">{t.name}</span>,
+        cell: (t) => (
+          <Link
+            to={`/tenants/${t.id}`}
+            className="font-medium hover:underline"
+            data-action={`tenant-${t.slug}-open`}
+          >
+            {t.name}
+          </Link>
+        ),
       },
       {
         id: "slug",
@@ -145,13 +163,13 @@ export default function TenantsRoute() {
         align: "right",
         cell: (t) => (
           <ActionsCell
-            items={rowActions(t, arcadia, refresh, setPending, setError)}
+            items={rowActions(t, arcadia, refresh, setPending, toast, navigate)}
             triggerDataAction={`tenant-${t.slug}-actions`}
           />
         ),
       },
     ],
-    [arcadia, refresh],
+    [arcadia, refresh, toast, navigate],
   )
 
   const tenantSummary = useMemo(
@@ -215,12 +233,6 @@ export default function TenantsRoute() {
         }
       />
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-
         <Card>
           <CardHeader className="flex flex-row items-center justify-between gap-4">
             <SearchInput
@@ -236,46 +248,56 @@ export default function TenantsRoute() {
           </CardHeader>
 
           <CardContent className="relative p-0">
-            <LoadingOverlay active={loading && tenants.length === 0} label="Loading tenants…" />
-            {table.total === 0 && !loading ? (
-              <EmptyState
-                title={search ? "No tenants match that search." : "No tenants yet."}
-                description={
-                  search ? "Try a different name, slug, or status." : "Create your first tenant to get started."
-                }
-                className="py-12"
+            <DataState
+              loading={loading}
+              error={error}
+              isEmpty={table.total === 0}
+              onRetry={refresh}
+              loadingLabel="Loading tenants…"
+              empty={
+                <EmptyState
+                  title={search ? "No tenants match that search." : "No tenants yet."}
+                  description={
+                    search
+                      ? "Try a different name, slug, or status."
+                      : "Create your first tenant to get started."
+                  }
+                  className="py-12"
+                />
+              }
+            >
+              <DataTable
+                columns={columns}
+                rows={table.pageRows}
+                getRowId={(t) => t.id}
+                sort={table.sort}
+                onSortToggle={table.toggleSort}
+                loading={loading && tenants.length > 0}
+                stickyHeader
               />
-            ) : (
-              <>
-                <DataTable
-                  columns={columns}
-                  rows={table.pageRows}
-                  getRowId={(t) => t.id}
-                  sort={table.sort}
-                  onSortToggle={table.toggleSort}
-                  loading={loading && tenants.length > 0}
-                  stickyHeader
-                />
-                <Pagination
-                  page={table.page}
-                  pageSize={table.pageSize}
-                  total={table.total}
-                  onPageChange={table.setPage}
-                  onPageSizeChange={table.setPageSize}
-                />
-              </>
-            )}
+              <Pagination
+                page={table.page}
+                pageSize={table.pageSize}
+                total={table.total}
+                onPageChange={table.setPage}
+                onPageSizeChange={table.setPageSize}
+              />
+            </DataState>
           </CardContent>
         </Card>
 
       <TenantCreateDialog
         open={createOpen}
         onClose={() => setCreateOpen(false)}
-        onCreated={async () => {
+        onCreated={async (tenant, adminEmail) => {
           setCreateOpen(false)
           await refresh()
+          // The money moment. Say what happened and what the operator can do
+          // next — previously the dialog just closed with no confirmation at all.
+          toast.success(`Tenant "${tenant.name}" created`, {
+            description: `${adminEmail} can now sign in with tenant ID "${tenant.slug}".`,
+          })
         }}
-        onError={setError}
       />
       <ConfirmDialog
         open={pending?.kind === "suspend"}
@@ -296,7 +318,7 @@ export default function TenantsRoute() {
         title="Deactivate tenant?"
         description={
           pending
-            ? `${pending.tenant.name} will be deactivated. This is more severe than suspending.`
+            ? `${pending.tenant.name} will be taken offline: nobody can sign in, and its apps stop serving. Its data is kept, and you can reactivate it from this table. Suspend instead if this is temporary.`
             : ""
         }
         confirmLabel="Deactivate"
@@ -319,9 +341,18 @@ function rowActions(
   arcadia: ReturnType<typeof useArcadiaClient>,
   refresh: () => Promise<void>,
   setPending: (p: PendingAction) => void,
-  setError: (msg: string | null) => void,
+  toast: ReturnType<typeof useToast>,
+  navigate: (to: string) => void,
 ): ActionItem[] {
-  const items: ActionItem[] = []
+  const items: ActionItem[] = [
+    {
+      id: "manage",
+      label: "Manage",
+      icon: <Settings2 className="size-4" />,
+      dataAction: `tenant-${t.slug}-manage`,
+      onSelect: () => navigate(`/tenants/${t.id}`),
+    },
+  ]
   if (t.status === "active") {
     items.push({
       id: "suspend",
@@ -340,8 +371,9 @@ function rowActions(
         try {
           await activateTenant(arcadia, t.id)
           await refresh()
+          toast.success(`Activated ${t.name}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Activate failed.")
+          toast.error(errorMessage(err, `activate ${t.name}`))
         }
       },
     })
@@ -356,29 +388,6 @@ function rowActions(
   return items
 }
 
-function formatArcadiaError(err: unknown, fallback: string): string {
-  if (!(err instanceof ArcadiaError)) return fallback
-  // 422 validation errors carry per-field reasons in `details`. Shape from
-  // Ecto's FallbackController is typically `{ field: ["msg1", "msg2"] }` or
-  // nested `{ tenant: { slug: ["has already been taken"] } }`. Flatten so
-  // the user sees what to fix instead of a generic "validation failed".
-  if (err.isValidation && err.details) {
-    const lines: string[] = []
-    const walk = (obj: unknown, prefix: string) => {
-      if (Array.isArray(obj)) {
-        lines.push(`${prefix}: ${obj.join(", ")}`)
-      } else if (obj && typeof obj === "object") {
-        for (const [k, v] of Object.entries(obj)) {
-          walk(v, prefix ? `${prefix}.${k}` : k)
-        }
-      }
-    }
-    walk(err.details, "")
-    if (lines.length) return `${err.message} — ${lines.join("; ")}`
-  }
-  return err.message
-}
-
 function slugify(name: string): string {
   return name
     .toLowerCase()
@@ -391,12 +400,10 @@ function TenantCreateDialog({
   open,
   onClose,
   onCreated,
-  onError,
 }: {
   open: boolean
   onClose: () => void
-  onCreated: () => Promise<void> | void
-  onError: (msg: string) => void
+  onCreated: (tenant: Tenant, adminEmail: string) => Promise<void> | void
 }) {
   const arcadia = useArcadiaClient()
   const [name, setName] = useState("")
@@ -407,6 +414,11 @@ function TenantCreateDialog({
   const [email, setEmail] = useState("")
   const [password, setPassword] = useState("")
   const [submitting, setSubmitting] = useState(false)
+  // Errors belong to the dialog, not the page. They used to be hoisted to a
+  // page-level banner that rendered *behind* the modal scrim — dimmed, above
+  // the fold, and unreadable — so a failed provision looked like nothing
+  // happened at all.
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!open) {
@@ -418,6 +430,7 @@ function TenantCreateDialog({
       setEmail("")
       setPassword("")
       setSubmitting(false)
+      setError(null)
     }
   }, [open])
 
@@ -436,8 +449,9 @@ function TenantCreateDialog({
     e.preventDefault()
     if (!canSubmit) return
     setSubmitting(true)
+    setError(null)
     try {
-      await provisionTenant(arcadia, {
+      const tenant = await provisionTenant(arcadia, {
         tenant: { name: name.trim(), slug },
         admin_user: {
           email: email.trim(),
@@ -446,9 +460,11 @@ function TenantCreateDialog({
           last_name: lastName.trim(),
         },
       })
-      await onCreated()
+      await onCreated(tenant, email.trim())
     } catch (err) {
-      onError(formatArcadiaError(err, "Failed to create tenant."))
+      // Keep the dialog open with the form intact so the operator can fix and
+      // resubmit without retyping.
+      setError(err)
       setSubmitting(false)
     }
   }
@@ -460,7 +476,8 @@ function TenantCreateDialog({
           <DialogHeader>
             <DialogTitle>New tenant</DialogTitle>
             <DialogDescription>
-              Provisions the tenant with default roles, quotas, and an initial admin user.
+              Creates the tenant with its system roles and an initial admin user who can
+              sign in straight away.
             </DialogDescription>
           </DialogHeader>
 
@@ -547,6 +564,8 @@ function TenantCreateDialog({
             </div>
           </div>
 
+          {error ? <DialogError error={error} context="create the tenant" /> : null}
+
           <DialogFooter>
             <Button
               type="button"
@@ -570,3 +589,5 @@ function TenantCreateDialog({
     </Dialog>
   )
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/users.tsx b/app/routes/users.tsx
index 6e54e99..b007ded 100644
--- a/app/routes/users.tsx
+++ b/app/routes/users.tsx
@@ -1,5 +1,4 @@
 import { useCallback, useEffect, useMemo, useState } from "react"
-import { Link } from "react-router"
 import {
   CheckCircle2,
   Eye,
@@ -14,7 +13,8 @@ import {
   X,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -27,17 +27,13 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Button } from "~/components/ui/button"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-} from "~/components/ui/card"
+import { Card, CardContent, CardHeader } from "~/components/ui/card"
 import {
   Dialog,
   DialogContent,
@@ -80,13 +76,15 @@ import {
   deleteUser,
   listUsers,
   setUserStatus,
+  startImpersonation,
   updateUser,
   type User,
   type UserInput,
   type UserStatus,
 } from "~/lib/arcadia/users"
 import { pageTitle } from "~/lib/page-meta"
-import { useSession } from "~/lib/session"
+import { beginImpersonation, useSession } from "~/lib/session"
+import { useNavigate } from "react-router"
 import { useRegisterContext } from "@crema/aifirst-ui/context"
 import { UserDetailSheet } from "~/components/users/user-detail-sheet"
 
@@ -99,44 +97,53 @@ export default function UsersRoute() {
   const arcadia = useArcadiaClient()
 
   const [tab, setTab] = useState<Tab>("users")
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
 
+  // Three independent lists, three independent load errors. A broken /roles
+  // call must not make the users table claim there are no users.
   const [users, setUsers] = useState<User[]>([])
   const [usersLoading, setUsersLoading] = useState(true)
+  const [usersError, setUsersError] = useState<unknown>(null)
+
   const [invitations, setInvitations] = useState<Invitation[]>([])
   const [invitationsLoading, setInvitationsLoading] = useState(true)
+  const [invitationsError, setInvitationsError] = useState<unknown>(null)
+
   const [roles, setRoles] = useState<Role[]>([])
   const [rolesLoading, setRolesLoading] = useState(true)
+  const [rolesError, setRolesError] = useState<unknown>(null)
 
   const refreshUsers = useCallback(async () => {
+    setUsersError(null)
     setUsersLoading(true)
     try {
       setUsers(await listUsers(arcadia))
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load users.")
+      // Raw throw: describeError() reads the status off it.
+      setUsersError(err)
     } finally {
       setUsersLoading(false)
     }
   }, [arcadia])
 
   const refreshInvitations = useCallback(async () => {
+    setInvitationsError(null)
     setInvitationsLoading(true)
     try {
       setInvitations(await listInvitations(arcadia))
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load invitations.")
+      setInvitationsError(err)
     } finally {
       setInvitationsLoading(false)
     }
   }, [arcadia])
 
   const refreshRoles = useCallback(async () => {
+    setRolesError(null)
     setRolesLoading(true)
     try {
       setRoles(await listRoles(arcadia))
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load roles.")
+      setRolesError(err)
     } finally {
       setRolesLoading(false)
     }
@@ -179,17 +186,6 @@ export default function UsersRoute() {
           </p>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Tabs value={tab} onValueChange={(v) => setTab(v as Tab)}>
           <TabsList>
             <TabsTrigger value="users" data-action="users-tab-users">
@@ -208,9 +204,8 @@ export default function UsersRoute() {
               users={users}
               roles={roles}
               loading={usersLoading}
+              error={usersError}
               onRefresh={refreshUsers}
-              onError={setError}
-              onInfo={setInfo}
             />
           </TabsContent>
           <TabsContent value="invitations">
@@ -218,18 +213,16 @@ export default function UsersRoute() {
               invitations={invitations}
               roles={roles}
               loading={invitationsLoading}
+              error={invitationsError}
               onRefresh={refreshInvitations}
-              onError={setError}
-              onInfo={setInfo}
             />
           </TabsContent>
           <TabsContent value="roles">
             <RolesPanel
               roles={roles}
               loading={rolesLoading}
+              error={rolesError}
               onRefresh={refreshRoles}
-              onError={setError}
-              onInfo={setInfo}
             />
           </TabsContent>
         </Tabs>
@@ -244,18 +237,32 @@ function UsersPanel({
   users,
   roles,
   loading,
+  error,
   onRefresh,
-  onError,
-  onInfo,
 }: {
   users: User[]
   roles: Role[]
   loading: boolean
+  error: unknown
   onRefresh: () => Promise<void>
-  onError: (msg: string | null) => void
-  onInfo: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
+  const navigate = useNavigate()
+
+  const impersonate = async (u: User) => {
+    try {
+      const token = await startImpersonation(arcadia, u.id)
+      // Swap the session to the impersonation token, then land on the user's
+      // own home. The "Viewing as…" banner appears from here on.
+      beginImpersonation(token.access_token)
+      toast.info(`Now viewing as ${u.email}`)
+      navigate("/")
+    } catch (err) {
+      toast.error(errorMessage(err, `impersonate ${u.email}`))
+    }
+  }
+
   const [search, setSearch] = useState("")
   const [statusFilter, setStatusFilter] = useState<"all" | UserStatus>("all")
   const [editor, setEditor] = useState<{ mode: "create" } | { mode: "edit"; user: User } | null>(null)
@@ -344,15 +351,15 @@ function UsersPanel({
               setEditor,
               setPendingDelete,
               setDetailUser,
-              setError: onError,
-              setInfo: onInfo,
+              toast,
+              impersonate,
             })}
             triggerDataAction={`user-${u.id}-actions`}
           />
         ),
       },
     ],
-    [arcadia, onError, onInfo, onRefresh],
+    [arcadia, onRefresh, toast],
   )
 
   const table = useTable<User>({
@@ -406,37 +413,43 @@ function UsersPanel({
       </CardHeader>
 
       <CardContent className="relative p-0">
-        <LoadingOverlay active={loading && users.length === 0} label="Loading users…" />
-        {table.total === 0 && !loading ? (
-          <EmptyState
-            title={search || statusFilter !== "all" ? "No users match those filters." : "No users yet."}
-            description={
-              search || statusFilter !== "all"
-                ? "Try a different search or status filter."
-                : "Invite your first user from the Invitations tab."
-            }
-            className="py-12"
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={table.total === 0}
+          onRetry={onRefresh}
+          loadingLabel="Loading users…"
+          empty={
+            <EmptyState
+              title={
+                search || statusFilter !== "all" ? "No users match those filters." : "No users yet."
+              }
+              description={
+                search || statusFilter !== "all"
+                  ? "Try a different search or status filter."
+                  : "Invite your first user from the Invitations tab."
+              }
+              className="py-12"
+            />
+          }
+        >
+          <DataTable
+            columns={columns}
+            rows={table.pageRows}
+            getRowId={(u) => u.id}
+            sort={table.sort}
+            onSortToggle={table.toggleSort}
+            loading={loading && users.length > 0}
+            stickyHeader
           />
-        ) : (
-          <>
-            <DataTable
-              columns={columns}
-              rows={table.pageRows}
-              getRowId={(u) => u.id}
-              sort={table.sort}
-              onSortToggle={table.toggleSort}
-              loading={loading && users.length > 0}
-              stickyHeader
-            />
-            <Pagination
-              page={table.page}
-              pageSize={table.pageSize}
-              total={table.total}
-              onPageChange={table.setPage}
-              onPageSizeChange={table.setPageSize}
-            />
-          </>
-        )}
+          <Pagination
+            page={table.page}
+            pageSize={table.pageSize}
+            total={table.total}
+            onPageChange={table.setPage}
+            onPageSizeChange={table.setPageSize}
+          />
+        </DataState>
       </CardContent>
 
       <ConfirmDialog
@@ -445,20 +458,22 @@ function UsersPanel({
         title="Delete user?"
         description={
           pendingDelete
-            ? `${pendingDelete.email} will be permanently removed. Their objects and audit history remain.`
+            ? `${pendingDelete.email} will be permanently removed and can no longer sign in. Their objects and audit history are kept. Suspend instead if this is temporary.`
             : ""
         }
         confirmLabel="Delete"
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const email = pendingDelete.email
           try {
             await deleteUser(arcadia, pendingDelete.id)
             setPendingDelete(null)
             await onRefresh()
+            toast.success(`Deleted ${email}`)
           } catch (err) {
-            onError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete ${email}`))
           }
         }}
       />
@@ -467,11 +482,11 @@ function UsersPanel({
         state={editor}
         roles={roles}
         onClose={() => setEditor(null)}
-        onSaved={async () => {
+        onSaved={async (message) => {
           setEditor(null)
           await onRefresh()
+          toast.success(message)
         }}
-        onError={onError}
       />
 
       <UserDetailSheet
@@ -504,11 +519,12 @@ function userRowActions(
     setEditor: (s: { mode: "edit"; user: User } | null) => void
     setPendingDelete: (u: User | null) => void
     setDetailUser: (u: User | null) => void
-    setError: (msg: string | null) => void
-    setInfo: (msg: string | null) => void
+    toast: ReturnType<typeof useToast>
+    impersonate: (u: User) => void
   },
 ): ActionItem[] {
-  const { arcadia, refresh, setEditor, setPendingDelete, setDetailUser, setError, setInfo } = ctx
+  const { arcadia, refresh, setEditor, setPendingDelete, setDetailUser, toast, impersonate } =
+    ctx
   const items: ActionItem[] = []
 
   items.push({
@@ -519,6 +535,18 @@ function userRowActions(
     onSelect: () => setDetailUser(u),
   })
 
+  // Support-facing: act as this user. Only meaningful for a user who can sign
+  // in; the server re-checks eligibility and 403s if not allowed.
+  if (u.status === "active") {
+    items.push({
+      id: "impersonate",
+      label: "Impersonate",
+      icon: <Eye className="size-4" />,
+      dataAction: `user-${u.id}-impersonate`,
+      onSelect: () => impersonate(u),
+    })
+  }
+
   items.push({
     id: "edit",
     label: "Edit",
@@ -535,10 +563,10 @@ function userRowActions(
       onSelect: async () => {
         try {
           await setUserStatus(arcadia, u.id, "suspended")
-          setInfo(`${u.email} suspended.`)
           await refresh()
+          toast.success(`Suspended ${u.email}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Suspend failed.")
+          toast.error(errorMessage(err, `suspend ${u.email}`))
         }
       },
     })
@@ -551,10 +579,10 @@ function userRowActions(
       onSelect: async () => {
         try {
           await setUserStatus(arcadia, u.id, "active")
-          setInfo(`${u.email} activated.`)
           await refresh()
+          toast.success(`Activated ${u.email}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Activate failed.")
+          toast.error(errorMessage(err, `activate ${u.email}`))
         }
       },
     })
@@ -577,13 +605,11 @@ function UserEditorDialog({
   roles,
   onClose,
   onSaved,
-  onError,
 }: {
   state: { mode: "create" } | { mode: "edit"; user: User } | null
   roles: Role[]
   onClose: () => void
-  onSaved: () => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (message: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
@@ -597,9 +623,14 @@ function UserEditorDialog({
   const [password, setPassword] = useState("")
   const [selectedRoleIds, setSelectedRoleIds] = useState<Set<string>>(new Set())
   const [saving, setSaving] = useState(false)
+  // The failure belongs where the operator is looking — inside this dialog,
+  // with the form still filled in — not behind the modal scrim.
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!open) return
+    setError(null)
+    setSaving(false)
     if (initial) {
       setEmail(initial.email)
       setFirstName(initial.first_name ?? "")
@@ -627,7 +658,7 @@ function UserEditorDialog({
   }
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       const input: UserInput = {
@@ -637,18 +668,18 @@ function UserEditorDialog({
         status,
         role_ids: Array.from(selectedRoleIds),
       }
-      if (!isEdit && password) input.password = password
-      else if (isEdit && password) input.password = password
+      if (password) input.password = password
 
       if (isEdit && initial) {
         await updateUser(arcadia, initial.id, input)
+        await onSaved(`Saved ${initial.email}`)
       } else {
         await createUser(arcadia, input)
+        await onSaved(`Created ${email.trim()}`)
       }
-      await onSaved()
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : err instanceof Error ? err.message : "Save failed.")
-    } finally {
+      // Keep the dialog open and the form intact so it can be fixed and resubmitted.
+      setError(err)
       setSaving(false)
     }
   }
@@ -759,6 +790,10 @@ function UserEditorDialog({
           </div>
         </div>
 
+        {error ? (
+          <DialogError error={error} context={isEdit ? "save the user" : "create the user"} />
+        ) : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} disabled={saving} data-action="user-form-cancel">
             Cancel
@@ -783,18 +818,17 @@ function InvitationsPanel({
   invitations,
   roles,
   loading,
+  error,
   onRefresh,
-  onError,
-  onInfo,
 }: {
   invitations: Invitation[]
   roles: Role[]
   loading: boolean
+  error: unknown
   onRefresh: () => Promise<void>
-  onError: (msg: string | null) => void
-  onInfo: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const [search, setSearch] = useState("")
   const [inviteOpen, setInviteOpen] = useState(false)
   const [pendingRevoke, setPendingRevoke] = useState<Invitation | null>(null)
@@ -850,15 +884,14 @@ function InvitationsPanel({
               arcadia,
               refresh: onRefresh,
               setPendingRevoke,
-              setError: onError,
-              setInfo: onInfo,
+              toast,
             })}
             triggerDataAction={`invitation-${i.id}-actions`}
           />
         ),
       },
     ],
-    [arcadia, onError, onInfo, onRefresh],
+    [arcadia, onRefresh, toast],
   )
 
   const table = useTable<Invitation>({
@@ -906,39 +939,43 @@ function InvitationsPanel({
       </CardHeader>
 
       <CardContent className="relative p-0">
-        <LoadingOverlay active={loading && invitations.length === 0} label="Loading invitations…" />
-        {table.total === 0 && !loading ? (
-          <EmptyState
-            title={search ? "No invitations match." : "No invitations yet."}
-            description={
-              search
-                ? "Try a different search."
-                : roles.length === 0
-                  ? "Create a role first, then invite users."
-                  : "Invite your first user."
-            }
-            className="py-12"
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={table.total === 0}
+          onRetry={onRefresh}
+          loadingLabel="Loading invitations…"
+          empty={
+            <EmptyState
+              title={search ? "No invitations match." : "No invitations yet."}
+              description={
+                search
+                  ? "Try a different search."
+                  : roles.length === 0
+                    ? "Create a role first, then invite users."
+                    : "Invite your first user."
+              }
+              className="py-12"
+            />
+          }
+        >
+          <DataTable
+            columns={columns}
+            rows={table.pageRows}
+            getRowId={(i) => i.id}
+            sort={table.sort}
+            onSortToggle={table.toggleSort}
+            loading={loading && invitations.length > 0}
+            stickyHeader
           />
-        ) : (
-          <>
-            <DataTable
-              columns={columns}
-              rows={table.pageRows}
-              getRowId={(i) => i.id}
-              sort={table.sort}
-              onSortToggle={table.toggleSort}
-              loading={loading && invitations.length > 0}
-              stickyHeader
-            />
-            <Pagination
-              page={table.page}
-              pageSize={table.pageSize}
-              total={table.total}
-              onPageChange={table.setPage}
-              onPageSizeChange={table.setPageSize}
-            />
-          </>
-        )}
+          <Pagination
+            page={table.page}
+            pageSize={table.pageSize}
+            total={table.total}
+            onPageChange={table.setPage}
+            onPageSizeChange={table.setPageSize}
+          />
+        </DataState>
       </CardContent>
 
       <ConfirmDialog
@@ -947,21 +984,22 @@ function InvitationsPanel({
         title="Revoke invitation?"
         description={
           pendingRevoke
-            ? `${pendingRevoke.email} will no longer be able to accept this invitation.`
+            ? `The link sent to ${pendingRevoke.email} stops working immediately, and they can't accept it. You can invite them again later.`
             : ""
         }
         confirmLabel="Revoke"
         variant="danger"
         onConfirm={async () => {
           if (!pendingRevoke) return
+          const email = pendingRevoke.email
           try {
             await revokeInvitation(arcadia, pendingRevoke.id)
             setPendingRevoke(null)
-            onInfo("Invitation revoked.")
             await onRefresh()
+            toast.success(`Revoked the invitation to ${email}`)
           } catch (err) {
-            onError(err instanceof ArcadiaError ? err.message : "Revoke failed.")
             setPendingRevoke(null)
+            toast.error(errorMessage(err, `revoke the invitation to ${email}`))
           }
         }}
       />
@@ -970,12 +1008,13 @@ function InvitationsPanel({
         open={inviteOpen}
         roles={roles}
         onClose={() => setInviteOpen(false)}
-        onSent={async () => {
+        onSent={async (email) => {
           setInviteOpen(false)
-          onInfo("Invitation sent.")
           await onRefresh()
+          toast.success(`Invitation sent to ${email}`, {
+            description: "They'll pick their own password when they accept.",
+          })
         }}
-        onError={onError}
       />
     </Card>
   )
@@ -994,11 +1033,10 @@ function invitationRowActions(
     arcadia: ReturnType<typeof useArcadiaClient>
     refresh: () => Promise<void>
     setPendingRevoke: (i: Invitation | null) => void
-    setError: (msg: string | null) => void
-    setInfo: (msg: string | null) => void
+    toast: ReturnType<typeof useToast>
   },
 ): ActionItem[] {
-  const { arcadia, refresh, setPendingRevoke, setError, setInfo } = ctx
+  const { arcadia, refresh, setPendingRevoke, toast } = ctx
   const status = invitationStatus(inv)
   const items: ActionItem[] = []
 
@@ -1011,10 +1049,10 @@ function invitationRowActions(
       onSelect: async () => {
         try {
           await resendInvitation(arcadia, inv.id)
-          setInfo(`Resent invitation to ${inv.email}.`)
           await refresh()
+          toast.success(`Resent the invitation to ${inv.email}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Resend failed.")
+          toast.error(errorMessage(err, `resend the invitation to ${inv.email}`))
         }
       },
     })
@@ -1039,37 +1077,37 @@ function InviteDialog({
   roles,
   onClose,
   onSent,
-  onError,
 }: {
   open: boolean
   roles: Role[]
   onClose: () => void
-  onSent: () => Promise<void>
-  onError: (msg: string | null) => void
+  onSent: (email: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const [email, setEmail] = useState("")
   const [roleId, setRoleId] = useState<string>("")
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!open) {
       setEmail("")
       setRoleId(roles[0]?.id ?? "")
+      setError(null)
+      setSaving(false)
     } else {
       setRoleId((prev) => prev || roles[0]?.id || "")
     }
   }, [open, roles])
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       await createInvitation(arcadia, { email, role_id: roleId })
-      await onSent()
+      await onSent(email.trim())
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : err instanceof Error ? err.message : "Invite failed.")
-    } finally {
+      setError(err)
       setSaving(false)
     }
   }
@@ -1113,6 +1151,8 @@ function InviteDialog({
           </div>
         </div>
 
+        {error ? <DialogError error={error} context="send the invitation" /> : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} disabled={saving} data-action="invite-form-cancel">
             Cancel
@@ -1136,17 +1176,16 @@ function InviteDialog({
 function RolesPanel({
   roles,
   loading,
+  error,
   onRefresh,
-  onError,
-  onInfo,
 }: {
   roles: Role[]
   loading: boolean
+  error: unknown
   onRefresh: () => Promise<void>
-  onError: (msg: string | null) => void
-  onInfo: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
+  const toast = useToast()
   const [search, setSearch] = useState("")
   const [editor, setEditor] = useState<{ mode: "create" } | { mode: "edit"; role: Role } | null>(null)
   const [pendingDelete, setPendingDelete] = useState<Role | null>(null)
@@ -1253,33 +1292,37 @@ function RolesPanel({
       </CardHeader>
 
       <CardContent className="relative p-0">
-        <LoadingOverlay active={loading && roles.length === 0} label="Loading roles…" />
-        {table.total === 0 && !loading ? (
-          <EmptyState
-            title={search ? "No roles match." : "No roles yet."}
-            description={search ? "Try a different search." : "Create your first role."}
-            className="py-12"
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={table.total === 0}
+          onRetry={onRefresh}
+          loadingLabel="Loading roles…"
+          empty={
+            <EmptyState
+              title={search ? "No roles match." : "No roles yet."}
+              description={search ? "Try a different search." : "Create your first role."}
+              className="py-12"
+            />
+          }
+        >
+          <DataTable
+            columns={columns}
+            rows={table.pageRows}
+            getRowId={(r) => r.id}
+            sort={table.sort}
+            onSortToggle={table.toggleSort}
+            loading={loading && roles.length > 0}
+            stickyHeader
           />
-        ) : (
-          <>
-            <DataTable
-              columns={columns}
-              rows={table.pageRows}
-              getRowId={(r) => r.id}
-              sort={table.sort}
-              onSortToggle={table.toggleSort}
-              loading={loading && roles.length > 0}
-              stickyHeader
-            />
-            <Pagination
-              page={table.page}
-              pageSize={table.pageSize}
-              total={table.total}
-              onPageChange={table.setPage}
-              onPageSizeChange={table.setPageSize}
-            />
-          </>
-        )}
+          <Pagination
+            page={table.page}
+            pageSize={table.pageSize}
+            total={table.total}
+            onPageChange={table.setPage}
+            onPageSizeChange={table.setPageSize}
+          />
+        </DataState>
       </CardContent>
 
       <ConfirmDialog
@@ -1288,21 +1331,22 @@ function RolesPanel({
         title="Delete role?"
         description={
           pendingDelete
-            ? `Users currently assigned to ${pendingDelete.name} will lose its permissions.`
+            ? `${pendingDelete.name} is removed from every user who has it, and they immediately lose its ${pendingDelete.permissions.length} permission${pendingDelete.permissions.length === 1 ? "" : "s"}. This can't be undone.`
             : ""
         }
         confirmLabel="Delete"
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const name = pendingDelete.name
           try {
             await deleteRole(arcadia, pendingDelete.id)
             setPendingDelete(null)
-            onInfo("Role deleted.")
             await onRefresh()
+            toast.success(`Deleted ${name}`)
           } catch (err) {
-            onError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete ${name}`))
           }
         }}
       />
@@ -1310,11 +1354,11 @@ function RolesPanel({
       <RoleEditorDialog
         state={editor}
         onClose={() => setEditor(null)}
-        onSaved={async () => {
+        onSaved={async (message) => {
           setEditor(null)
           await onRefresh()
+          toast.success(message)
         }}
-        onError={onError}
       />
     </Card>
   )
@@ -1351,12 +1395,10 @@ function RoleEditorDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: { mode: "create" } | { mode: "edit"; role: Role } | null
   onClose: () => void
-  onSaved: () => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (message: string) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
@@ -1369,9 +1411,12 @@ function RoleEditorDialog({
   const [description, setDescription] = useState("")
   const [permissionsText, setPermissionsText] = useState("")
   const [saving, setSaving] = useState(false)
+  const [error, setError] = useState<unknown>(null)
 
   useEffect(() => {
     if (!open) return
+    setError(null)
+    setSaving(false)
     if (initial) {
       setName(initial.name)
       setSlug(initial.slug)
@@ -1386,7 +1431,7 @@ function RoleEditorDialog({
   }, [open, initial])
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       const permissions = permissionsText
@@ -1394,12 +1439,15 @@ function RoleEditorDialog({
         .map((s) => s.trim())
         .filter(Boolean)
       const input: RoleInput = { name, slug, description: description || null, permissions }
-      if (isEdit && initial) await updateRole(arcadia, initial.id, input)
-      else await createRole(arcadia, input)
-      await onSaved()
+      if (isEdit && initial) {
+        await updateRole(arcadia, initial.id, input)
+        await onSaved(`Saved ${name.trim()}`)
+      } else {
+        await createRole(arcadia, input)
+        await onSaved(`Created ${name.trim()}`)
+      }
     } catch (err) {
-      onError(err instanceof ArcadiaError ? err.message : err instanceof Error ? err.message : "Save failed.")
-    } finally {
+      setError(err)
       setSaving(false)
     }
   }
@@ -1468,6 +1516,10 @@ function RoleEditorDialog({
           </div>
         </div>
 
+        {error ? (
+          <DialogError error={error} context={isEdit ? "save the role" : "create the role"} />
+        ) : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} data-action="role-form-cancel">
             {readOnly ? "Close" : "Cancel"}
@@ -1497,3 +1549,5 @@ function countBy<T>(arr: T[], key: (x: T) => string): Record<string, number> {
     return acc
   }, {})
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/app/routes/webhooks.tsx b/app/routes/webhooks.tsx
index 23ec4b8..ef9003c 100644
--- a/app/routes/webhooks.tsx
+++ b/app/routes/webhooks.tsx
@@ -15,7 +15,8 @@ import {
   Webhook as WebhookIcon,
 } from "lucide-react"
 
-import { ArcadiaError, useArcadiaClient } from "@crema/arcadia-client"
+import { useArcadiaClient } from "@crema/arcadia-core-client"
+import { useToast } from "@crema/notification-ui"
 import {
   ActionsCell,
   BadgeCell,
@@ -28,9 +29,11 @@ import {
   type Column,
 } from "@crema/table-ui"
 import { SearchInput } from "@crema/search-ui"
-import { AlertBanner, ConfirmDialog, EmptyState, LoadingOverlay } from "@crema/feedback-ui"
+import { ConfirmDialog, EmptyState } from "@crema/feedback-ui"
 
 import { AppShell } from "~/components/layout/app-shell"
+import { DataState, DialogError } from "~/components/data-state"
+import { errorMessage } from "~/lib/errors"
 import { Badge } from "~/components/ui/badge"
 import { Button } from "~/components/ui/button"
 import {
@@ -89,11 +92,12 @@ type EditorState =
 export default function WebhooksRoute() {
   const session = useSession()
   const arcadia = useArcadiaClient()
+  const toast = useToast()
 
   const [webhooks, setWebhooks] = useState<Webhook[]>([])
   const [loading, setLoading] = useState(true)
-  const [error, setError] = useState<string | null>(null)
-  const [info, setInfo] = useState<string | null>(null)
+  // The raw thrown value — `DataState` normalises it into plain language.
+  const [error, setError] = useState<unknown>(null)
   const [search, setSearch] = useState("")
   const [editor, setEditor] = useState<EditorState>(null)
   const [pendingDelete, setPendingDelete] = useState<Webhook | null>(null)
@@ -110,7 +114,7 @@ export default function WebhooksRoute() {
     try {
       setWebhooks(await listWebhooks(arcadia))
     } catch (err) {
-      setError(err instanceof ArcadiaError ? err.message : "Failed to load webhooks.")
+      setError(err)
     } finally {
       setLoading(false)
     }
@@ -200,15 +204,14 @@ export default function WebhooksRoute() {
               setPendingDelete,
               setDeliveriesFor,
               setRevealedSecret,
-              setError,
-              setInfo,
+              toast,
             })}
             triggerDataAction={`webhook-${w.id}-actions`}
           />
         ),
       },
     ],
-    [arcadia, refresh],
+    [arcadia, refresh, toast],
   )
 
   const summary = useMemo(
@@ -274,17 +277,6 @@ export default function WebhooksRoute() {
           </div>
         </header>
 
-        {error ? (
-          <AlertBanner variant="error" dismissible onDismiss={() => setError(null)}>
-            {error}
-          </AlertBanner>
-        ) : null}
-        {info ? (
-          <AlertBanner variant="success" dismissible onDismiss={() => setInfo(null)}>
-            {info}
-          </AlertBanner>
-        ) : null}
-
         <Card>
           <CardHeader className="flex flex-row items-center gap-3">
             <SearchInput
@@ -300,38 +292,42 @@ export default function WebhooksRoute() {
           </CardHeader>
 
           <CardContent className="relative p-0">
-            <LoadingOverlay active={loading && webhooks.length === 0} label="Loading webhooks…" />
-            {table.total === 0 && !loading ? (
-              <EmptyState
-                icon={<WebhookIcon className="size-6" />}
-                title={search ? "No webhooks match." : "No webhooks yet."}
-                description={
-                  search
-                    ? "Try a different search."
-                    : "Add an endpoint to receive event notifications from arcadia."
-                }
-                className="py-12"
+            <DataState
+              loading={loading}
+              error={error}
+              isEmpty={table.total === 0}
+              onRetry={refresh}
+              loadingLabel="Loading webhooks…"
+              empty={
+                <EmptyState
+                  icon={<WebhookIcon className="size-6" />}
+                  title={search ? "No webhooks match." : "No webhooks yet."}
+                  description={
+                    search
+                      ? "Try a different search."
+                      : "Add an endpoint to receive event notifications from arcadia."
+                  }
+                  className="py-12"
+                />
+              }
+            >
+              <DataTable
+                columns={columns}
+                rows={table.pageRows}
+                getRowId={(w) => w.id}
+                sort={table.sort}
+                onSortToggle={table.toggleSort}
+                loading={loading && webhooks.length > 0}
+                stickyHeader
               />
-            ) : (
-              <>
-                <DataTable
-                  columns={columns}
-                  rows={table.pageRows}
-                  getRowId={(w) => w.id}
-                  sort={table.sort}
-                  onSortToggle={table.toggleSort}
-                  loading={loading && webhooks.length > 0}
-                  stickyHeader
-                />
-                <Pagination
-                  page={table.page}
-                  pageSize={table.pageSize}
-                  total={table.total}
-                  onPageChange={table.setPage}
-                  onPageSizeChange={table.setPageSize}
-                />
-              </>
-            )}
+              <Pagination
+                page={table.page}
+                pageSize={table.pageSize}
+                total={table.total}
+                onPageChange={table.setPage}
+                onPageSizeChange={table.setPageSize}
+              />
+            </DataState>
           </CardContent>
         </Card>
       </div>
@@ -349,14 +345,15 @@ export default function WebhooksRoute() {
         variant="danger"
         onConfirm={async () => {
           if (!pendingDelete) return
+          const target = pendingDelete
           try {
-            await deleteWebhook(arcadia, pendingDelete.id)
+            await deleteWebhook(arcadia, target.id)
             setPendingDelete(null)
-            setInfo("Webhook deleted.")
             await refresh()
+            toast.success(`Deleted webhook ${target.url}`)
           } catch (err) {
-            setError(err instanceof ArcadiaError ? err.message : "Delete failed.")
             setPendingDelete(null)
+            toast.error(errorMessage(err, `delete webhook ${target.url}`))
           }
         }}
       />
@@ -364,21 +361,19 @@ export default function WebhooksRoute() {
       <WebhookEditorDialog
         state={editor}
         onClose={() => setEditor(null)}
-        onSaved={async (created) => {
+        onSaved={async (saved, wasEdit) => {
           setEditor(null)
-          if (created?.secret) {
-            setRevealedSecret({ webhookId: created.id, secret: created.secret, isNew: true })
+          if (saved?.secret) {
+            setRevealedSecret({ webhookId: saved.id, secret: saved.secret, isNew: true })
           }
           await refresh()
+          toast.success(
+            wasEdit ? `Saved webhook ${saved.url}` : `Created webhook ${saved.url}`,
+          )
         }}
-        onError={setError}
       />
 
-      <DeliveriesDialog
-        webhook={deliveriesFor}
-        onClose={() => setDeliveriesFor(null)}
-        onError={setError}
-      />
+      <DeliveriesDialog webhook={deliveriesFor} onClose={() => setDeliveriesFor(null)} />
 
       <RevealSecretDialog reveal={revealedSecret} onClose={() => setRevealedSecret(null)} />
     </AppShell>
@@ -402,8 +397,7 @@ function rowActions(
     setRevealedSecret: (
       r: { webhookId: string; secret: string; isNew?: boolean } | null,
     ) => void
-    setError: (m: string | null) => void
-    setInfo: (m: string | null) => void
+    toast: ReturnType<typeof useToast>
   },
 ): ActionItem[] {
   const {
@@ -413,8 +407,7 @@ function rowActions(
     setPendingDelete,
     setDeliveriesFor,
     setRevealedSecret,
-    setError,
-    setInfo,
+    toast,
   } = ctx
   const items: ActionItem[] = []
 
@@ -439,9 +432,17 @@ function rowActions(
     onSelect: async () => {
       try {
         const r = await testWebhook(arcadia, w.id)
-        setInfo(r.ok === false ? r.message ?? "Test failed." : "Test event sent.")
+        // A 200 from arcadia can still carry a failed delivery — the endpoint
+        // answered, the *webhook* didn't. Say which.
+        if (r.ok === false) {
+          toast.error(`Test event to ${w.url} failed`, {
+            description: r.message ?? undefined,
+          })
+        } else {
+          toast.success(`Sent test event to ${w.url}`)
+        }
       } catch (err) {
-        setError(err instanceof ArcadiaError ? err.message : "Test failed.")
+        toast.error(errorMessage(err, `send a test event to ${w.url}`))
       }
     },
   })
@@ -455,10 +456,10 @@ function rowActions(
       onSelect: async () => {
         try {
           await pauseWebhook(arcadia, w.id)
-          setInfo("Webhook paused.")
           await refresh()
+          toast.success(`Paused webhook ${w.url}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Pause failed.")
+          toast.error(errorMessage(err, `pause webhook ${w.url}`))
         }
       },
     })
@@ -471,10 +472,10 @@ function rowActions(
       onSelect: async () => {
         try {
           await resumeWebhook(arcadia, w.id)
-          setInfo("Webhook resumed.")
           await refresh()
+          toast.success(`Resumed webhook ${w.url}`)
         } catch (err) {
-          setError(err instanceof ArcadiaError ? err.message : "Resume failed.")
+          toast.error(errorMessage(err, `resume webhook ${w.url}`))
         }
       },
     })
@@ -492,8 +493,9 @@ function rowActions(
           setRevealedSecret({ webhookId: updated.id, secret: updated.secret })
         }
         await refresh()
+        toast.success(`Regenerated the secret for ${w.url}`)
       } catch (err) {
-        setError(err instanceof ArcadiaError ? err.message : "Regenerate failed.")
+        toast.error(errorMessage(err, `regenerate the secret for ${w.url}`))
       }
     },
   })
@@ -514,17 +516,18 @@ function WebhookEditorDialog({
   state,
   onClose,
   onSaved,
-  onError,
 }: {
   state: EditorState
   onClose: () => void
-  onSaved: (created?: Webhook) => Promise<void>
-  onError: (msg: string | null) => void
+  onSaved: (saved: Webhook, wasEdit: boolean) => Promise<void>
 }) {
   const arcadia = useArcadiaClient()
   const open = state !== null
   const isEdit = state?.mode === "edit"
   const initial = isEdit ? state.webhook : null
+  // A failed submit speaks inside the dialog — a page banner would sit behind
+  // the scrim, dimmed and unread.
+  const [error, setError] = useState<unknown>(null)
 
   const [url, setUrl] = useState("")
   const [description, setDescription] = useState("")
@@ -535,7 +538,11 @@ function WebhookEditorDialog({
   const [saving, setSaving] = useState(false)
 
   useEffect(() => {
-    if (!open) return
+    if (!open) {
+      setError(null)
+      return
+    }
+    setError(null)
     if (initial) {
       setUrl(initial.url)
       setDescription(initial.description ?? "")
@@ -558,7 +565,7 @@ function WebhookEditorDialog({
   }, [open, initial])
 
   const submit = async () => {
-    onError(null)
+    setError(null)
     setSaving(true)
     try {
       const events = eventsText
@@ -583,19 +590,15 @@ function WebhookEditorDialog({
       }
       if (isEdit && initial) {
         const updated = await updateWebhook(arcadia, initial.id, input)
-        await onSaved(updated)
+        await onSaved(updated, true)
       } else {
         const created = await createWebhook(arcadia, input)
-        await onSaved(created)
+        await onSaved(created, false)
       }
     } catch (err) {
-      onError(
-        err instanceof ArcadiaError
-          ? err.message
-          : err instanceof Error
-            ? err.message
-            : "Save failed.",
-      )
+      // Keep the dialog open with the form intact so the operator can fix and
+      // resubmit without retyping.
+      setError(err)
     } finally {
       setSaving(false)
     }
@@ -713,6 +716,13 @@ function WebhookEditorDialog({
           </div>
         </div>
 
+        {error ? (
+          <DialogError
+            error={error}
+            context={isEdit ? "save the webhook" : "create the webhook"}
+          />
+        ) : null}
+
         <DialogFooter>
           <Button variant="outline" onClick={onClose} disabled={saving} data-action="webhook-form-cancel">
             Cancel
@@ -730,30 +740,36 @@ function WebhookEditorDialog({
 function DeliveriesDialog({
   webhook,
   onClose,
-  onError,
 }: {
   webhook: Webhook | null
   onClose: () => void
-  onError: (msg: string | null) => void
 }) {
   const arcadia = useArcadiaClient()
   const [deliveries, setDeliveries] = useState<WebhookDelivery[]>([])
   const [loading, setLoading] = useState(true)
+  // A failed deliveries load is not an empty delivery log — say which one it is.
+  const [error, setError] = useState<unknown>(null)
+  const [reloadKey, setReloadKey] = useState(0)
 
   useEffect(() => {
     if (!webhook) return
     let mounted = true
     setLoading(true)
+    setError(null)
     listWebhookDeliveries(arcadia, webhook.id, { limit: 50 })
-      .then((d) => mounted && setDeliveries(d))
-      .catch((err) =>
-        onError(err instanceof ArcadiaError ? err.message : "Failed to load deliveries."),
-      )
-      .finally(() => mounted && setLoading(false))
+      .then((d) => {
+        if (mounted) setDeliveries(d)
+      })
+      .catch((err) => {
+        if (mounted) setError(err)
+      })
+      .finally(() => {
+        if (mounted) setLoading(false)
+      })
     return () => {
       mounted = false
     }
-  }, [arcadia, webhook, onError])
+  }, [arcadia, webhook, reloadKey])
 
   if (!webhook) return null
 
@@ -767,15 +783,18 @@ function DeliveriesDialog({
           </DialogDescription>
         </DialogHeader>
 
-        {loading ? (
-          <p className="py-6 text-center text-sm text-muted-foreground">
-            <RefreshCw className="mr-1 inline size-3.5 animate-spin" /> Loading…
-          </p>
-        ) : deliveries.length === 0 ? (
-          <p className="py-6 text-center text-sm text-muted-foreground">
-            No deliveries recorded yet.
-          </p>
-        ) : (
+        <DataState
+          loading={loading}
+          error={error}
+          isEmpty={deliveries.length === 0}
+          onRetry={() => setReloadKey((n) => n + 1)}
+          loadingLabel="Loading deliveries…"
+          empty={
+            <p className="py-6 text-center text-sm text-muted-foreground">
+              No deliveries recorded yet.
+            </p>
+          }
+        >
           <ul className="flex flex-col divide-y rounded-md border">
             {deliveries.map((d) => (
               <li key={d.id} className="flex items-start justify-between gap-3 px-3 py-2 text-sm">
@@ -825,7 +844,7 @@ function DeliveriesDialog({
               </li>
             ))}
           </ul>
-        )}
+        </DataState>
 
         <DialogFooter>
           <Button variant="outline" onClick={onClose} data-action="webhook-deliveries-close">
@@ -898,3 +917,5 @@ function countBy<T>(arr: T[], key: (x: T) => string): Record<string, number> {
     return acc
   }, {})
 }
+
+export { RouteErrorBoundary as ErrorBoundary } from "~/components/route-error"
diff --git a/arcadia-admin-ux-spec.md b/arcadia-admin-ux-spec.md
new file mode 100644
index 0000000..9615d62
--- /dev/null
+++ b/arcadia-admin-ux-spec.md
@@ -0,0 +1,15 @@
+
+## Phase 6 — as built (2026-07-14) — Settings restructure
+
+`arcadia-admin` (branch `feat/admin-ux-overhaul`). Settings was "assistant config mislabeled as Settings, plus a dev-scaffold Account panel." Restructured honestly:
+
+- **Assistant** (was "LLM") — model/endpoint/budgets + advanced transport + reset. Honestly named.
+- **Personas** (was "Agents") — the persona editor, now labelled "Stored in this browser only, not synced to your account" (they're localStorage).
+- **Tenant** (new, `platform.tenants`-gated) — **reuses the Phase-4 BrandingTab + LocalizationTab** scoped to the operator's active tenant (loaded via getTenant(session.tenantId)). This is the component-reuse the phase order was designed for; verified end-to-end (branding save → "Branding updated"). Gated to platform admins because the underlying endpoints are platform-only (my Phase-1 change); a non-holder simply doesn't see the section.
+- **Appearance** — replaced the "use the icons in the appbar" fluff with the real inline pickers (Theme, Font size, Surface tint, Background — the same components the appbar mounts).
+- **Account** — replaced the dev scaffold ("Wire ~/lib/identity.ts…" shown verbatim to users) with real read-only identity (name/email/active tenant/roles from the session) + an "Edit profile" link to /profile.
+- **About** — trimmed to honest one-liners.
+
+Sections filter by capability; the persisted section falls back to Assistant if unavailable to the user.
+
+Verified: honest section labels, no dev scaffold text, real Account identity, real Appearance controls, "this browser" persona label, and the Tenant section reusing Phase-4 tabs with a working save. Typecheck 36→36 (zero added), 24-route sweep clean.
diff --git a/docs/LLM_PROXY_CONTRACT.md b/docs/LLM_PROXY_CONTRACT.md
index 6014eb1..1411a3c 100644
--- a/docs/LLM_PROXY_CONTRACT.md
+++ b/docs/LLM_PROXY_CONTRACT.md
@@ -1,6 +1,6 @@
 # LLM Proxy Contract
 
-> **Status: implemented.** Backend lives in `arcadia-app` at `apps/arcadia_core/lib/arcadia/ai/llm_proxy*` (see commit `75669f1`). This document remains the contract that `lib-llm-providers-ui` and `app/lib/arcadia/llm-proxy.ts` expect from arcadia — keep it in sync if either side changes.
+> **Status: implemented.** Backend lives in `arcadia-core` at `apps/arcadia_core/lib/arcadia/ai/llm_proxy*` (see commit `75669f1`). This document remains the contract that `lib-llm-providers-ui` and `app/lib/arcadia/llm-proxy.ts` expect from arcadia — keep it in sync if either side changes.
 
 ## Why a proxy?
 
diff --git a/docs/RAG.md b/docs/RAG.md
index 7da9af9..4ec7d80 100644
--- a/docs/RAG.md
+++ b/docs/RAG.md
@@ -14,7 +14,7 @@ shape.
 |---|---|---|
 | Lib / service | `@crema/lexical-rag-ui` | `arcadia-search` (Rust) |
 | Engine | MiniSearch (BM25, JS) | Tantivy (BM25, Rust) |
-| Where it runs | In the user's browser | Sibling of arcadia-app |
+| Where it runs | In the user's browser | Sibling of arcadia-core |
 | Index storage | Static JSON, fetched once | mmap'd disk, ~30–80MB resident |
 | Practical corpus size | ~5–10MB / ~50–100k chunks | GB-scale, no hard cap |
 | Update cadence | Static — rebuilt at app build time | Live — cron, webhook, or admin trigger |
@@ -58,7 +58,7 @@ The index is a single JSON file built offline by
 **How it's wired here.**
 
 - Build script: `arcadia-admin/scripts/build-docs-index.mjs` reads
-  markdown from `../reference/arcadia-app/`, chunks at H1–H3,
+  markdown from `../reference/arcadia-core/`, chunks at H1–H3,
   produces `public/docs-index.json`. Runs on `npm run build:docs`
   (and as the `prebuild` step before `npm run build`).
 - Tool wrapper: `app/lib/admin-tools.ts` constructs a singleton
@@ -130,7 +130,7 @@ text extraction, webhook signature, service tokens) see
 
 The default deploy runs **both**:
 
-- `search_docs` indexes the same arcadia-app docs the parity corpus
+- `search_docs` indexes the same arcadia-core docs the parity corpus
   on `arcadia-search` indexes. Same content, two engines.
 - This is intentional — it means the assistant always has *something*
   to search, even if `arcadia-search` is down or unreachable. The
diff --git a/scripts/build-docs-index.mjs b/scripts/build-docs-index.mjs
index c217807..4b3829c 100644
--- a/scripts/build-docs-index.mjs
+++ b/scripts/build-docs-index.mjs
@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 // Build the /docs-index.json bundle consumed by @crema/lexical-rag-ui at
 // runtime. Thin wrapper — all engine logic lives in the lib's builder.ts;
-// this file owns the per-app config (which arcadia-app docs to index and
+// this file owns the per-app config (which arcadia-core docs to index and
 // how to tag them).
 //
 // Run: npm run build:docs
@@ -18,11 +18,11 @@ import MiniSearch from "minisearch"
 import { buildIndex } from "../../lib-lexical-rag-ui/src/builder.mjs"
 
 const ROOT = resolve(dirname(fileURLToPath(import.meta.url)), "..")
-const ARCADIA = resolve(ROOT, "../reference/arcadia-app")
+const ARCADIA = resolve(ROOT, "../reference/arcadia-core")
 const OUT = resolve(ROOT, "public/docs-index.json")
 
 const SOURCES = [
-  // Arcadia platform docs (resolved against ARCADIA = ../reference/arcadia-app).
+  // Arcadia platform docs (resolved against ARCADIA = ../reference/arcadia-core).
   { path: "README.md", tags: ["core"] },
   { path: "docs/ARCADIA.md", tags: ["core"] },
   { path: "docs/MODULAR_MONOLITH.md", tags: ["core"] },
diff --git a/tsconfig.json b/tsconfig.json
index c563df5..96aeef1 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -26,8 +26,8 @@
       "@crema/llm-ui/*": ["../lib-llm-ui/src/*"],
       "@crema/action-bus": ["../lib-action-bus/src/index.tsx"],
       "@crema/action-bus/*": ["../lib-action-bus/src/*"],
-      "@crema/arcadia-client": ["../lib-arcadia-client/src/index.tsx"],
-      "@crema/arcadia-client/*": ["../lib-arcadia-client/src/*"],
+      "@crema/arcadia-core-client": ["../lib-arcadia-core-client/src/index.tsx"],
+      "@crema/arcadia-core-client/*": ["../lib-arcadia-core-client/src/*"],
       "@crema/integration-registry-client": ["../lib-integration-registry-client/src/index.tsx"],
       "@crema/integration-registry-client/*": ["../lib-integration-registry-client/src/*"],
       "@crema/arcadia-auth-ui": ["../lib-arcadia-auth-ui/src/index.tsx"],
diff --git a/vite.config.ts b/vite.config.ts
index 49fff80..2983ba3 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -60,7 +60,7 @@ const searchUiSrc = fileURLToPath(
   new URL("../lib-search-ui/src", import.meta.url),
 )
 const arcadiaClientSrc = fileURLToPath(
-  new URL("../lib-arcadia-client/src", import.meta.url),
+  new URL("../lib-arcadia-core-client/src", import.meta.url),
 )
 const integrationRegistryClientSrc = fileURLToPath(
   new URL("../lib-integration-registry-client/src", import.meta.url),
@@ -175,7 +175,7 @@ export default defineConfig({
       { find: "@crema/auth-ui", replacement: `${authUiSrc}/index.tsx` },
       { find: "@crema/table-ui", replacement: `${tableUiSrc}/index.tsx` },
       { find: "@crema/search-ui", replacement: `${searchUiSrc}/index.tsx` },
-      { find: "@crema/arcadia-client", replacement: `${arcadiaClientSrc}/index.tsx` },
+      { find: "@crema/arcadia-core-client", replacement: `${arcadiaClientSrc}/index.tsx` },
       {
         find: "@crema/integration-registry-client",
         replacement: `${integrationRegistryClientSrc}/index.tsx`,