Mikkeli Matlock
1dcfe60b4d
feat(04-02): add staleness detection to main speed display
- Add staleness check timer (1s interval) with proper disposal
- Speed/heading dim at 3s, show dashes at 10s (matching overlay)
- Apply staleness opacity to both speed and heading displays
- Remove WakelockPlus management (now in GpsDataManager)
- Remove WidgetsBindingObserver (now in GpsDataManager)
- Simplify background heartbeat (removed _isInBackground check)
- Wire overlay provider into GpsDataManager via initState
- Add haptic feedback to theme/unit cycling
- Update _buildSpeedDisplay to accept opacity parameter