Fix LAN network cleanup state for stability

[calcitem]

Summary

• keep the LAN network service alive after disconnects by resetting its sockets instead of marking it permanently disposed
• reset handshake completers, counters, and connection metadata whenever the service is torn down so stale state does not leak between sessions

Testing

• ./format.sh s (fails locally because dart is unavailable)

---

https://chatgpt.com/codex/tasks/task_e_68eb6e4e99288320a2c3959ef52108af

[github-actions]

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Guard _disposeInternals against re-entrancy

The new _disposeInternals({bool markDisposed = true}) skips setting _disposed when markDisposed is false and immediately resets it to false at the end. _handleDisconnection now calls this method with markDisposed: false, so during teardown the service never enters a disposed state. Socket listeners (onError, onDone) and heartbeat timers check _disposed before invoking _handleDisconnection, meaning multiple callbacks that fire during the same disconnect will all pass the check and re-enter the teardown logic. This can invoke onDisconnected and UI updates multiple times and race concurrent clean‑ups. To keep the service reusable while still preventing repeated work, _disposeInternals should temporarily mark _disposed true while cleaning up and only set it back to false after the reset completes.

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