UI overhaul: unified sidebar layout with app-scoped views

Replace disconnected Transactions/Applications pages with a persistent
collapsible sidebar listing apps by health status. Add app-scoped view
(/apps/:group) with filtered stats, route chips, and scoped table.
Merge Processor Tree into diagram detail panel with Inspector/Tree
toggle and resizable divider. Remove max-width constraint for full
viewport usage. All view states are deep-linkable via URL.

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

ui/src/router.tsx

@@ -7,7 +7,7 @@ import { OidcCallback } from './auth/OidcCallback';
 import { ExecutionExplorer } from './pages/executions/ExecutionExplorer';
 import { OidcAdminPage } from './pages/admin/OidcAdminPage';
 import { RoutePage } from './pages/routes/RoutePage';
-import { ApplicationsPage } from './pages/apps/ApplicationsPage';
+import { AppScopedView } from './pages/dashboard/AppScopedView';
 
 const SwaggerPage = lazy(() => import('./pages/swagger/SwaggerPage').then(m => ({ default: m.SwaggerPage })));
 
@@ -28,7 +28,7 @@ export const router = createBrowserRouter([
         children: [
           { index: true, element: <Navigate to="/executions" replace /> },
           { path: 'executions', element: <ExecutionExplorer /> },
-          { path: 'apps', element: <ApplicationsPage /> },
+          { path: 'apps/:group', element: <AppScopedView /> },
           { path: 'apps/:group/routes/:routeId', element: <RoutePage /> },
           { path: 'admin/oidc', element: <OidcAdminPage /> },
           { path: 'swagger', element: <Suspense fallback={null}><SwaggerPage /></Suspense> },