admin: completeness + UI consistency pass

Arcadia wiring:
- home: real Overview dashboard (tenants/users/audit/health probe) replacing the inherited Vibespace welcome tiles; skeleton loaders, refresh button, registers admin context
- profile: split into Account (synced via getUser/updateUser of session user) and local Preferences; updateSessionUser keeps the appbar in sync after edits
- session: drop unused signIn mock, add updateSessionUser, refresh tests
- profile schema: drop redundant Profile.name/email (session is the source of truth)
- routes: delete orphaned resources route + lib

Auth flows that previously 404'd:
- /signup, /login/forgot, /login/reset, /login/2fa wired via @crema/arcadia-auth-ui
- shared AuthShell + AuthBrand wrapper

Assistant tools (admin-tools.ts):
- +10 tools: deactivate_tenant, set_user_status, delete_user, list_memberships, list_roles, revoke_api_key, create_user, update_user, assign_role, remove_role
- list_memberships gains user_id filter for "tenants this user belongs to" queries
- search_kb / read_chunk: new token resolution (window override → VITE_ARCADIA_SEARCH_TOKEN service token → operator session JWT → "dev"); on 401/403 emit a tailored hint based on which token was used

UI consistency:
- new PageHeader component
- AppShell.title was unrendered — dropped; first-child padding on #main-content keeps the floating actions pill from colliding with header content
- removed dead "Sign in required" fallback cards from 14 routes (AppShell already redirects)
- stripped p-6 from outer wrappers across 14 routes (was double-padding under AppShell's own p-6)
- migrated home + tenants to PageHeader

arcadia-search ergonomics:
- scripts/mint-search-token.mjs + `npm run mint:search-token` mints HS512 JWT with required tenant_id claim, upserts VITE_ARCADIA_SEARCH_TOKEN into .env.local
- README/.env document the new VITE_ARCADIA_SEARCH_URL / VITE_ARCADIA_SEARCH_TOKEN knobs
- .env.local now gitignored

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/routes/login.reset.tsx

@@ -0,0 +1,47 @@
+import { useNavigate, useSearchParams } from "react-router"
+
+import { PasswordResetConfirmForm } from "@crema/arcadia-auth-ui"
+import { pageTitle } from "~/lib/page-meta"
+import { AuthBrand, AuthShell } from "~/components/auth/auth-shell"
+
+export const meta = () => pageTitle("Set new password")
+
+export default function ResetPasswordRoute() {
+  const [params] = useSearchParams()
+  const navigate = useNavigate()
+  const token = params.get("token") ?? ""
+
+  if (!token) {
+    return (
+      <AuthShell>
+        <div
+          className="flex w-full max-w-sm flex-col items-center gap-3 rounded-xl border bg-card p-6 text-center text-sm"
+          style={{ borderColor: "var(--border)" }}
+        >
+          <h1 className="text-base font-semibold">Reset link invalid</h1>
+          <p className="text-muted-foreground">
+            No token in the URL. Request a fresh password reset email.
+          </p>
+          <button
+            type="button"
+            onClick={() => navigate("/login/forgot")}
+            className="mt-2 text-xs font-medium text-primary hover:underline"
+            data-action="reset-request-new"
+          >
+            Request a new link
+          </button>
+        </div>
+      </AuthShell>
+    )
+  }
+
+  return (
+    <AuthShell>
+      <PasswordResetConfirmForm
+        brand={<AuthBrand />}
+        token={token}
+        onSuccess={() => navigate("/login?reset=ok", { replace: true })}
+      />
+    </AuthShell>
+  )
+}