fix+upstream: hooks-order crash, ConfirmDialog/PageHeader/skeletons, styled error boundary

Hoists hooks above early return (render-time Navigate); ports finance's
ConfirmDialog/PageHeader/loading/states + APC error-copy mapper; removes
window.confirm, dead appbar search, and seeded fake notifications; wires toasts.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/components/layout/app-shell.tsx

@@ -1,7 +1,7 @@
 import { useEffect, useRef, useState } from "react"
 
 const SIDEBAR_KEY = "crema.shell.sidebar"
-import { NavLink, useNavigate } from "react-router"
+import { NavLink, Navigate, useNavigate } from "react-router"
 import {
   Bell,
   LayoutDashboard,
@@ -52,7 +52,6 @@ import {
   dismissAll,
   markAllRead,
   markRead,
-  seedIfEmpty,
   unreadCount,
   useNotifications,
 } from "~/lib/notifications"
@@ -66,7 +65,6 @@ import {
   DropdownMenuSeparator,
   DropdownMenuTrigger,
 } from "~/components/ui/dropdown-menu"
-import { Input } from "~/components/ui/input"
 import {
   Sheet,
   SheetContent,
@@ -129,17 +127,10 @@ export function AppShell({
     ),
   }
 
-  // Protected shell: bounce to /login when there's no session.
-  useEffect(() => {
-    if (typeof window === "undefined") return
-    if (!session) {
-      const next = encodeURIComponent(
-        window.location.pathname + window.location.search,
-      )
-      navigate(`/login?next=${next}`, { replace: true })
-    }
-  }, [session, navigate])
-  if (!session) return null
+  // All hooks must be called unconditionally — declare them BEFORE any
+  // early return so React's render-time hook count is stable. (Previously
+  // `if (!session) return null` sat above these hooks, so the hook count
+  // changed the moment the session flipped → hook-order crash.)
   const [expanded, setExpanded] = useState<boolean>(() => {
     if (typeof window === "undefined") return false
     return localStorage.getItem(SIDEBAR_KEY) === "1"
@@ -149,10 +140,20 @@ export function AppShell({
   }, [expanded])
   const [mobileOpen, setMobileOpen] = useState(false)
   const [scriptsOpen, setScriptsOpen] = useState(false)
-  const BrandIcon = brand.icon
-
   useScriptsHotkey(() => setScriptsOpen(true))
 
+  // Protected shell: redirect to /login when there's no session. Done at
+  // render time (not in an effect) so we don't briefly render a blank
+  // shell during the redirect window.
+  if (!session) {
+    const next =
+      typeof window !== "undefined"
+        ? encodeURIComponent(window.location.pathname + window.location.search)
+        : ""
+    return <Navigate to={`/login?next=${next}`} replace />
+  }
+  const BrandIcon = brand.icon
+
   return (
     <div
       data-theme={theme}
@@ -289,14 +290,20 @@ export function AppShell({
             </SheetContent>
           </Sheet>
           <AppbarTitle>{title}</AppbarTitle>
-          <div className="relative ml-6 hidden md:block">
-            <Search className="pointer-events-none absolute top-1/2 left-2.5 size-4 -translate-y-1/2 text-muted-foreground" />
-            <Input
-              data-action="appbar-search"
-              placeholder="Search…"
-              className="h-9 w-80 pl-8"
-            />
-          </div>
+          {/* Honest search affordance: the template has no search index, so
+              this routes to the Assistant — the app's real natural-language
+              surface — rather than being a dead <input>. Forks with a search
+              route should point this at it (and add a ⌘K palette hint). */}
+          <button
+            type="button"
+            data-action="appbar-search"
+            onClick={() => navigate("/assistant")}
+            className="ml-6 hidden h-9 w-80 items-center gap-2 rounded-md border bg-background px-2.5 text-left text-sm text-muted-foreground transition hover:bg-accent/40 md:flex"
+            title="Ask the assistant — it can answer questions and drive the app."
+          >
+            <Search className="size-4" />
+            <span className="flex-1 truncate">Ask the assistant…</span>
+          </button>
           <AppbarSpacer />
           <AppbarActions>
             <Button
@@ -459,10 +466,6 @@ function NotificationsBell() {
   const unread = unreadCount(items)
   const navigate = useNavigate()
 
-  useEffect(() => {
-    seedIfEmpty()
-  }, [])
-
   return (
     <Popover>
       <PopoverTrigger