fix: sidebar selection highlight and scoped command palette search

Two fixes:
- Pass sidebarReveal state on sidebar navigation so the design system
  can highlight the selected entry (it compares internal /apps/... paths
  against this state value, not the browser URL)
- Command palette search now includes scope.appId and scope.routeId
  so results are filtered to the current sidebar selection

Note: sidebar highlighting works on the exchanges tab. The design
system's selectedPath logic only checks pathname.startsWith("/exchanges/")
for sidebarReveal — a DS update is needed to support /dashboard/ and
/runtime/ tabs too.

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

ui/src/components/LayoutShell.tsx

@@ -98,11 +98,17 @@ function LayoutContent() {
   const { open: paletteOpen, setOpen: setPaletteOpen } = useCommandPalette();
   const { scope, setTab } = useScope();
 
-  // Exchange full-text search via command palette
+  // Exchange full-text search via command palette (scoped to current sidebar selection)
   const [paletteQuery, setPaletteQuery] = useState('');
   const debouncedQuery = useDebouncedValue(paletteQuery, 300);
   const { data: exchangeResults } = useSearchExecutions(
-    { text: debouncedQuery || undefined, offset: 0, limit: 10 },
+    {
+      text: debouncedQuery || undefined,
+      application: scope.appId || undefined,
+      routeId: scope.routeId || undefined,
+      offset: 0,
+      limit: 10,
+    },
     false,
   );
 
@@ -243,13 +249,17 @@ function LayoutContent() {
     navigate(`${baseParts.join('/')}?text=${encodeURIComponent(query)}`);
   }, [navigate, scope.appId, scope.routeId]);
 
-  // Translate Sidebar's internal paths to our URL structure
+  // Translate Sidebar's internal paths to our URL structure.
+  // Pass `sidebarReveal` state so the Sidebar can highlight the selected entry
+  // (it compares its internal /apps/... paths against this state value).
   const handleSidebarNavigate = useCallback((path: string) => {
+    const state = { sidebarReveal: path };
+
     // /apps/:appId and /apps/:appId/:routeId → current tab
     const appMatch = path.match(/^\/apps\/([^/]+)(?:\/(.+))?$/);
     if (appMatch) {
       const [, sAppId, sRouteId] = appMatch;
-      navigate(sRouteId ? `/${scope.tab}/${sAppId}/${sRouteId}` : `/${scope.tab}/${sAppId}`);
+      navigate(sRouteId ? `/${scope.tab}/${sAppId}/${sRouteId}` : `/${scope.tab}/${sAppId}`, { state });
       return;
     }
 
@@ -257,11 +267,11 @@ function LayoutContent() {
     const agentMatch = path.match(/^\/agents\/([^/]+)(?:\/(.+))?$/);
     if (agentMatch) {
       const [, sAppId, sInstanceId] = agentMatch;
-      navigate(sInstanceId ? `/runtime/${sAppId}/${sInstanceId}` : `/runtime/${sAppId}`);
+      navigate(sInstanceId ? `/runtime/${sAppId}/${sInstanceId}` : `/runtime/${sAppId}`, { state });
       return;
     }
 
-    navigate(path);
+    navigate(path, { state });
   }, [navigate, scope.tab]);
 
   return (