Log PUBLISH payload in handlePublish

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

src/App.tsx

@@ -47,6 +47,7 @@ export default function App() {
   );
 
   const handlePublish = async (data: any, route?: { key: string }) => {
+    console.log("PUBLISH", { data, route: route?.key });
     if (typeof window !== "undefined" && window.parent !== window) {
       window.parent.postMessage(
         { type: "PUBLISH", data: { data, route: route?.key } },