AU-061: Live GPS tracking during activity

Track: 1 — MVP
Section: 1.37 GPS Activity Tracking (Running/Cycling)
Status: [ ] Todo
Repo: app-user
Branch: feature/AU-061-live-gps-tracking

Done When

Screen shows: live map with route line drawing, elapsed time, current pace/speed, distance, heart rate (from ring/band if connected). GPS points recorded every 2-5 seconds

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