refactor: wrap routes in LayoutShell layout route

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

src/App.tsx

@@ -19,7 +19,8 @@ import { buildSearchData } from './mocks/searchData'
 import { exchanges } from './mocks/exchanges'
 import { routes } from './mocks/routes'
 import { agents } from './mocks/agents'
-import { SIDEBAR_APPS, buildRouteToAppMap } from './mocks/sidebar'
+import { buildRouteToAppMap } from './mocks/sidebar'
+import { LayoutShell } from './layout/LayoutShell'
 
 const routeToApp = buildRouteToAppMap()
 
@@ -78,6 +79,7 @@ export default function App() {
   return (
     <>
       <Routes>
+        <Route element={<LayoutShell />}>
           <Route path="/" element={<Navigate to="/apps" replace />} />
           <Route path="/apps" element={<Dashboard />} />
           <Route path="/apps/:id" element={<Dashboard />} />
@@ -93,6 +95,7 @@ export default function App() {
           <Route path="/admin/oidc" element={<OidcConfig />} />
           <Route path="/admin/rbac" element={<UserManagement />} />
           <Route path="/api-docs" element={<ApiDocs />} />
+        </Route>
         <Route path="/inventory" element={<Inventory />} />
       </Routes>
       <CommandPalette