fix: keep sidebar selection when switching tabs

Normalize the sidebar selectedPath so the app highlight persists across
tab switches (Dashboard, Runtime, Deployments). Also make sidebar clicks
tab-aware: clicking an app navigates to the current tab's path instead
of always going to /exchanges/.

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

ui/src/components/LayoutShell.tsx

@@ -443,7 +443,14 @@ function LayoutContent() {
     if (sidebarRevealPath.startsWith('/admin') && !adminOpen) setAdminOpen(true);
   }, [sidebarRevealPath]); // eslint-disable-line react-hooks/exhaustive-deps
 
-  const effectiveSelectedPath = sidebarRevealPath ?? location.pathname;
+  // Normalize path so sidebar highlights the app regardless of which tab is active.
+  // Sidebar nodes use /exchanges/{slug} paths, so map /dashboard/{slug}, /apps/{slug}, etc.
+  const effectiveSelectedPath = useMemo(() => {
+    const raw = sidebarRevealPath ?? location.pathname;
+    const match = raw.match(/^\/(exchanges|dashboard|apps|runtime)\/([^/]+)(\/.*)?$/);
+    if (match) return `/exchanges/${match[2]}${match[3] ?? ''}`;
+    return raw;
+  }, [sidebarRevealPath, location.pathname]);
 
   // --- About Me dialog -----------------------------------------------
   const [aboutMeOpen, setAboutMeOpen] = useState(false);
@@ -629,6 +636,17 @@ function LayoutContent() {
       return;
     }
 
+    const exchangeMatch = path.match(/^\/exchanges\/([^/]+)(?:\/(.+))?$/);
+    if (exchangeMatch) {
+      const [, sAppId, sRouteId] = exchangeMatch;
+      if (scope.tab === 'apps') {
+        navigate(`/apps/${sAppId}`, { state });
+      } else {
+        navigate(sRouteId ? `/${scope.tab}/${sAppId}/${sRouteId}` : `/${scope.tab}/${sAppId}`, { state });
+      }
+      return;
+    }
+
     const agentMatch = path.match(/^\/agents\/([^/]+)(?:\/(.+))?$/);
     if (agentMatch) {
       const [, sAppId, sInstanceId] = agentMatch;