AD-003: Reconnect on disconnect — auto-retry with user feedback

Track: 1 — MVP
Section: 1.37 Serial Connection
Status: [ ] Todo
Repo: app-device
Branch: feature/AD-003-auto-reconnect

Done When

On unexpected disconnect, show "Reconnecting..." and retry 3 times. Success → resume. Failure → "Connection lost. Check cable." with manual retry

Notes

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