Add debug logging for childId

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/app/ai/page.tsx

@@ -28,6 +28,7 @@ export default function AIChatPage() {
   const [error, setError] = useState<string>("");
 
   useEffect(() => {
+    console.log("AI page: childId from useFamily:", childId);
     if (childId) {
       fetchSessions();
     }