Misaka cbbadd547d Add WebSocket heartbeat, client cleanup, and connection toast notifications ...

- 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>

2026-05-17 12:34:02 +08:00

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