Fix UI sync bugs and disconnect hang

- Add NeighborDown event handler in gossip network to reliably remove disconnected peers.
- Add 1-second timeout wrapper to router.shutdown() to prevent UI hanging on disconnect.

src/core/mod.rs

@@ -54,25 +54,30 @@ struct ActiveSession {
 
 impl ActiveSession {
     async fn shutdown(self, audio_backend: Arc<PipeWireBackend>) {
-        // Abort asynchronous tasks first
+        crate::log_msg("ActiveSession::shutdown started");
         self.datagram_task.abort();
         self.mixer_task.abort();
         self.event_task.abort();
+        crate::log_msg("Aborted tasks");
 
-        // Stop the audio backend in a blocking thread to avoid blocking the async executor
         let audio_backend_clone = audio_backend.clone();
         let _ = tokio::task::spawn_blocking(move || {
+            crate::log_msg("Stopping audio backend...");
             let _ = audio_backend_clone.stop();
+            crate::log_msg("Audio backend stopped");
         }).await;
 
-        // Leave room
+        crate::log_msg("Leaving room...");
         let _ = self.room_state.leave().await;
+        crate::log_msg("Room left");
 
-        // Shut down router
-        let _ = self.router.shutdown().await;
+        crate::log_msg("Shutting down router...");
+        let _ = tokio::time::timeout(std::time::Duration::from_secs(1), self.router.shutdown()).await;
+        crate::log_msg("Router shut down");
 
-        // Clean up capture thread
+        crate::log_msg("Joining capture thread...");
         let _ = self.capture_thread.join();
+        crate::log_msg("ActiveSession::shutdown complete");
     }
 }
 

src/network/gossip.rs

@@ -195,6 +195,11 @@ impl RoomState for IrohGossipState {
                     }
                     Ok(iroh_gossip::api::Event::NeighborDown(peer_id)) => {
                         crate::log_msg(&format!("Gossip event: NeighborDown={:?}", peer_id));
+                        let removed = peers.lock().unwrap().remove(&peer_id).is_some();
+                        if removed {
+                            crate::log_msg(&format!("Removed peer due to NeighborDown: {:?}", peer_id));
+                            let _ = event_tx.send(RoomEvent::PeerLeft(peer_id)).await;
+                        }
                     }
                     Ok(other) => {
                         crate::log_msg(&format!("Gossip other event: {:?}", other));