fix(peer): coalesce full UI view publications

Keep one queued and one replaceable pending snapshot for remote-library and Call-to-Play views while preserving lifecycle-event FIFO delivery. Generation barriers and fenced drains prevent stale nonempty views from crossing disable or acknowledgement boundaries.

Test Plan:
- just test
- just clippy
- focused burst, lifecycle ordering, fence, repeated-barrier, and stale-view tests
- independent ordering review
- git diff --check

crates/lanspread-peer-cli/src/main.rs

@@ -34,6 +34,7 @@ use lanspread_peer::{
     PeerCommand,
     PeerEndpoint,
     PeerEvent,
+    PeerEventReceiver,
     PeerGameDB,
     PeerIdentity,
     PeerRuntimeComponent,
@@ -44,6 +45,7 @@ use lanspread_peer::{
     StreamInstallSettings,
     load_peer_identity,
     migrate_legacy_state,
+    peer_event_channel,
     start_peer_with_options,
 };
 use lanspread_peer_cli::{
@@ -308,7 +310,7 @@ async fn main() -> eyre::Result<()> {
     let fixture_seeds = seed_fixtures(&args.games_dir, &args.fixtures)?;
     let migration = migrate_legacy_state(&args.games_dir, &args.state_dir).await;
 
-    let (tx_events, rx_events) = mpsc::unbounded_channel();
+    let (tx_events, rx_events) = peer_event_channel();
     let peer_game_db = Arc::new(RwLock::new(PeerGameDB::new()));
     let catalog_game_db = Arc::new(catalog_game_db);
     let active_outbound_transfers: OutboundTransfers = Arc::new(RwLock::new(HashMap::new()));
@@ -865,7 +867,7 @@ async fn wait_peers(shared: &SharedState, count: usize, timeout: Duration) -> ey
 }
 
 async fn event_loop(
-    mut rx_events: mpsc::UnboundedReceiver<PeerEvent>,
+    mut rx_events: PeerEventReceiver,
     shared: Arc<SharedState>,
     writer: JsonlWriter,
 ) {