Introduce a setMute protocol action and an NAudio-backed
AudioControlService so the Android client can toggle the Windows
render endpoint mute state over WebSocket.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Add heartbeat ping every 5 seconds to detect stale connections
- Replace clients when same IP reconnects instead of accumulating
- Remove unavailable clients on connect and heartbeat probe
- Marshal UI updates to UI thread via SynchronizationContext
- Show balloon toast on device connect/disconnect
- Add disposal safety check for UpdateTrayStatus
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
