Harden dashboard realtime state and controls

apps/dashboard/src/app/router.tsx

@@ -6,12 +6,14 @@ import { MediaPage } from '../features/media/media-page.js';
 import { OperationsPage } from '../features/operations/operations-page.js';
 import { PerformancePage } from '../features/performance/performance-page.js';
 import { SettingsRoute } from '../features/settings/settings-route.js';
+import { RouteErrorPage } from './route-error-page.js';
 
 export function createDashboardRoutes(): RouteObject[] {
   return [
     {
       path: '/',
       element: <AppShell />,
+      errorElement: <RouteErrorPage />,
       children: [
         { index: true, element: <OverviewPage /> },
         { path: 'conversations', element: <ConversationRoute /> },