feat(explorer): async task execution, CLI selector fix, WebSocket frame handling

- Task queue now executes tasks in parallel using Promise.all
- addFolderToQueue uses selected CLI tool instead of hardcoded 'gemini'
- Added CSS styles for queue-cli-selector toolbar
- Force refresh notification list after all tasks complete
- Fixed WebSocket frame parsing to handle Ping/Pong control frames
- Respond to Ping with Pong, ignore other control frames
- Eliminates garbled characters in WebSocket logs

ccw/src/templates/dashboard-js/views/explorer.js

@@ -836,6 +836,12 @@ async function startTaskQueue() {
     'Explorer'
   );
   
+  // Force refresh notification list to ensure all notifications are displayed
+  if (typeof renderGlobalNotifications === 'function') {
+    renderGlobalNotifications();
+    updateGlobalNotifBadge();
+  }
+  
   // Re-enable start button if there are pending tasks
   const hasPending = updateTaskQueue.some(t => t.status === 'pending');
   document.getElementById('startQueueBtn').disabled = !hasPending;