Two fixes for call connectivity:
1. ICE candidate buffering: Candidates arriving before the WebRTC
session exists (callee ringing) or before remote description is
set (caller waiting for answer) are now queued in
pendingIceCandidates and flushed once setRemoteDescription is
called. This was the root cause of calls getting stuck at
"Connecting" — ICE candidates were silently dropped.
2. Stale event filter: All signaling events older than 30 seconds
are discarded in CallManager.onSignalingEvent() to prevent
old cached events from triggering phantom calls.
Also: removed cleanup() from WebRTC onDisconnected callback to
avoid double-cleanup race with the CallManager state observer.
https://claude.ai/code/session_017hZm7yu7CzmcQgZGSaqSXS
Claude
0688a46604