AU-008: Show user-friendly error messages for BLE failures

Track: 1 — MVP
Section: 1.23 BLE Error Recovery
Status: [ ] Todo
Repo: app-user
Branch: feature/AU-008-ble-error-messages

Done When

"Bluetooth turned off" → "Turn on Bluetooth to sync". "Device out of range" → "Move closer to your device". "Unknown error" → "Sync failed. Tap to retry"

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