AU-010: On first pair, trigger full history download from device

Track: 1 — MVP
Section: 1.24 Historical Backfill
Status: [ ] Todo
Repo: app-user
Branch: feature/AU-010-first-pair-history

Done When

After pairing completes, automatically call BLE commands for all history types: activity, sleep, HRV, SpO2, temperature. Don't require user action

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