ui: fix messages worker

packages/ui-default/components/message/worker.ts

@@ -40,6 +40,10 @@ function initConn(path: string, port: MessagePort, cookie: any) {
   conn.onclose = (ev) => broadcastMsg({ type: 'close', error: ev.reason });
   conn.onmessage = (message) => {
     if (process.env.NODE_ENV !== 'production') console.log('SharedWorker.port.onmessage: ', message);
+    if (message.data === 'ping') {
+      conn.send('pong');
+      return;
+    }
     const payload = JSON.parse(message.data);
     if (payload.event === 'auth') {
       if (['PermissionError', 'PrivilegeError'].includes(payload.error)) {