- Add Background Sync API support for location sync when coming back online
- Add silent push notifications for requesting location updates
- Add useServiceWorkerMessages hook for handling SW messages
- Connect service worker to location sharing for background updates
This enables:
- Silent location requests via push without showing notifications
- Automatic location sync when device comes back online
- Service worker communication for background location updates
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>