[fix] close remote stream tabs after host disconnects

apps/desktop/src/gui/runtime/connection_runtime.cpp

@@ -308,7 +308,13 @@ void GuiRuntime::CloseServerController(const std::string& remote_id) {
   if (!peer_ || remote_id.empty() || controller_cleanup_tasks_.count(remote_id))
     return;
   controller_cleanup_tasks_[remote_id] = session_cleanup_queue_.PostTask(
-      [peer = peer_, remote_id] { LeaveConnection(peer, remote_id.c_str()); });
+      [peer = peer_, transmission_id = std::string(client_id_), remote_id] {
+        if (DisconnectPeerConnection(peer, transmission_id.c_str(),
+                                     remote_id.c_str()) != 0) {
+          LOG_WARN("[{}] Could not queue controller disconnect notification",
+                   remote_id);
+        }
+      });
 }
 
 void GuiRuntime::CloseConnectionPeer() {

apps/desktop/src/gui/runtime/peer_event_handler.cpp

@@ -379,6 +379,10 @@ void PeerEventHandler::OnConnectionStatus(ConnectionStatus status,
 
         runtime->focus_on_stream_window_ = false;
 
+        if (status == ConnectionStatus::Closed) {
+          props->remote_close_pending_.store(true, std::memory_order_release);
+        }
+
         break;
       }
       case ConnectionStatus::IncorrectPassword: {

apps/desktop/src/gui/runtime/remote_session.h

@@ -73,6 +73,8 @@ struct RemoteSession {
   PeerPtr* peer_ = nullptr;
   std::shared_ptr<PeerEventHandler> peer_events_;
   std::atomic<bool> closing_{false};
+  // Transport callbacks request tab closure; only the UI thread destroys it.
+  std::atomic<bool> remote_close_pending_{false};
   std::string audio_label_ = kAudioStream;
   std::string data_label_ = kDataStream;
   std::string mouse_label_ = kMouseStream;