Add App fully mounted log

Author: ammar-agent

src/App.tsx

@@ -209,6 +209,11 @@ function AppInner() {
   // Handle auto-continue after compaction (when user uses /compact -c)
   useAutoCompactContinue();
 
+  // Mark when UI is fully ready
+  useEffect(() => {
+    console.log(`[RENDERER] ✅ App fully mounted and interactive: ${performance.now()}ms`);
+  }, []);
+
   // Sync selectedWorkspace with URL hash
   useEffect(() => {
     if (selectedWorkspace) {