fix(call-to-play): compact expired snapshots

Expired call histories were removed on the next store insertion, so an otherwise
idle peer could continue carrying stale payload through handshakes after the
five-minute UI retention ended.

Run the same inactive-call compaction before local and handshake snapshots. This
makes the expiry boundary exact without trimming any event from an active call.

Test Plan:
- `just fmt` -- passed
- `just clippy` -- passed
- `just test` -- passed, 147 peer tests
- `git diff --cached --check` -- passed

crates/lanspread-peer/src/lib.rs

@@ -510,7 +510,7 @@ async fn handle_peer_commands(
                 let _ = reply.send(result);
             }
             PeerCommand::GetCallToPlayEvents { reply } => {
-                let events = ctx.call_to_play.read().await.snapshot();
+                let events = ctx.call_to_play.write().await.snapshot();
                 events::send(tx_notify_ui, PeerEvent::CallToPlayEvents(events.clone()));
                 if let Some(reply) = reply {
                     let _ = reply.send(events);