AU-009: No app crash on any BLE error path

Track: 1 — MVP
Section: 1.23 BLE Error Recovery
Status: [ ] Todo
Repo: app-user
Branch: feature/AU-009-ble-crash-prevention

Done When

Wrap all BLE callbacks in try-catch. Test: force-kill Bluetooth mid-sync, unpair device during sync, send malformed BLE data → no crash in any scenario

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