docs: clarify search ownership and icon-rail click behavior

Search: DS renders dumb controlled input, app owns state and passes
filterQuery to SidebarTree instances. Icon-rail click: fires both
onCollapseToggle and onToggle simultaneously, no navigation.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/superpowers/specs/2026-04-02-composable-sidebar-design.md

@@ -60,9 +60,12 @@ The outer shell. Renders the sidebar frame with an optional search input and col
 | `collapsed` | `boolean` | `false` | Render as ~48px icon rail |
 | `onCollapseToggle` | `() => void` | - | Collapse/expand toggle clicked |
 | `onSearchChange` | `(query: string) => void` | - | Search input changed. Omit to hide search. |
+| `searchValue` | `string` | `''` | Controlled value for the search input |
 | `children` | `ReactNode` | - | Sidebar.Header, Sidebar.Section, Sidebar.Footer |
 | `className` | `string` | - | Additional CSS class |
 
+**Search state ownership:** The DS renders the search input as a dumb controlled input and calls `onSearchChange` on every keystroke. The consuming application owns the search state and passes it to each `SidebarTree` as `filterQuery`. This lets the app control filtering behavior (e.g., clear search when switching sections, filter only certain sections). The DS does not hold any search state internally.
+
 **Rendering rules:**
 - Expanded: full width (~260px), all content visible
 - Collapsed: ~48px wide, only icons visible, tooltips on hover
@@ -129,7 +132,9 @@ v [icon] APPLICATIONS
 [icon]     <- centered, tooltip shows label on hover
 ```
 
-Header has: chevron (left), icon, label. Chevron rotates on collapse/expand. Active section gets the amber left-border accent (existing pattern). Clicking the header calls `onToggle`. In icon-rail mode, clicking the icon calls both `onCollapseToggle` (to expand the sidebar) and `onToggle`.
+Header has: chevron (left), icon, label. Chevron rotates on collapse/expand. Active section gets the amber left-border accent (existing pattern). Clicking the header calls `onToggle`.
+
+**Icon-rail click behavior:** In collapsed mode, clicking a section icon fires both `onCollapseToggle` and `onToggle` simultaneously on the same click. The sidebar expands and the section opens in one motion. No navigation occurs — the user is expanding the sidebar to see what's inside, not committing to a destination. They click a tree item after the section is visible to navigate.
 
 ### `<Sidebar.Footer>`
 
@@ -278,6 +283,7 @@ useEffect(() => {
 <Sidebar
   collapsed={sidebarCollapsed}
   onCollapseToggle={() => setSidebarCollapsed(v => !v)}
+  searchValue={filterQuery}
   onSearchChange={setFilterQuery}
 >
   <Sidebar.Header logo={<CameleerLogo />} title="cameleer" version="v3.2.1" />
@@ -310,6 +316,78 @@ useEffect(() => {
 </Sidebar>
 ```
 
+## Mock App Migration — LayoutShell
+
+The 11 page files currently duplicating `<AppShell sidebar={<Sidebar apps={SIDEBAR_APPS} />}>` will be consolidated into a single `LayoutShell` component.
+
+### `src/layout/LayoutShell.tsx`
+
+Composes the sidebar once using the new compound API. All page-specific content is rendered via `<Outlet />`.
+
+```tsx
+// src/layout/LayoutShell.tsx
+export function LayoutShell() {
+  const [sidebarCollapsed, setSidebarCollapsed] = useState(false)
+  const [filterQuery, setFilterQuery] = useState('')
+  const [appsCollapsed, setAppsCollapsed] = useState(false)
+  const [agentsCollapsed, setAgentsCollapsed] = useState(false)
+  const [routesCollapsed, setRoutesCollapsed] = useState(false)
+  const { starredIds, isStarred, toggleStar } = useStarred()
+  const location = useLocation()
+  // ... build tree nodes from SIDEBAR_APPS, starred section, etc.
+
+  return (
+    <AppShell
+      sidebar={
+        <Sidebar
+          collapsed={sidebarCollapsed}
+          onCollapseToggle={() => setSidebarCollapsed(v => !v)}
+          searchValue={filterQuery}
+          onSearchChange={setFilterQuery}
+        >
+          <Sidebar.Header logo={...} title="cameleer" version="v3.2.1" />
+          <Sidebar.Section label="Applications" icon={...}
+            collapsed={appsCollapsed} onToggle={() => setAppsCollapsed(v => !v)}>
+            <SidebarTree nodes={appNodes} filterQuery={filterQuery} ... />
+          </Sidebar.Section>
+          <Sidebar.Section label="Agents" icon={...}
+            collapsed={agentsCollapsed} onToggle={() => setAgentsCollapsed(v => !v)}>
+            <SidebarTree nodes={agentNodes} filterQuery={filterQuery} ... />
+          </Sidebar.Section>
+          <Sidebar.Section label="Routes" icon={...}
+            collapsed={routesCollapsed} onToggle={() => setRoutesCollapsed(v => !v)}>
+            <SidebarTree nodes={routeNodes} filterQuery={filterQuery} ... />
+          </Sidebar.Section>
+          {/* Starred section built from useStarred + SIDEBAR_APPS */}
+          <Sidebar.Footer>
+            <Sidebar.FooterLink icon={...} label="Admin" ... />
+            <Sidebar.FooterLink icon={...} label="API Docs" ... />
+          </Sidebar.Footer>
+        </Sidebar>
+      }
+    >
+      <Outlet />
+    </AppShell>
+  )
+}
+```
+
+### Route structure change
+
+`App.tsx` switches from per-page `<Route element={<Page />}>` to a layout route:
+
+```tsx
+<Route element={<LayoutShell />}>
+  <Route path="/apps" element={<Dashboard />} />
+  <Route path="/apps/:id" element={<Dashboard />} />
+  ...all existing routes...
+</Route>
+```
+
+All tree-building helpers (`buildAppTreeNodes`, `buildRouteTreeNodes`, `buildAgentTreeNodes`), starred section logic (`collectStarredItems`, `StarredGroup`), `formatCount`, and `sidebarRevealPath` handling move from `Sidebar.tsx` into `LayoutShell.tsx`. Each page file loses its `<AppShell sidebar={...}>` wrapper and becomes just the page content.
+
+The Inventory page's `LayoutSection` keeps its own inline `<Sidebar>` demo with `SAMPLE_APPS` data — it's a showcase, not a navigation shell.
+
 ## Breaking Change
 
 This is a **breaking change** to the `Sidebar` API. The old `<Sidebar apps={[...]} onNavigate={...} />` signature is removed entirely. The consuming application must migrate to the compound component API in the same release cycle.