- Add complete Service Worker implementation with IndexedDB storage
- Implement background sync for content fetch and notification delivery
- Add Service Worker Manager for registration and communication
- Include push notification support with VAPID key handling
- Implement TTL-at-fire logic with IndexedDB persistence
- Add callback management with HTTP and local callback support
- Include comprehensive error handling and fallback mechanisms
- Support for periodic sync and background task scheduling
- Mirror Android SQLite and iOS Core Data schema in IndexedDB
BREAKING CHANGE: Web implementation requires Service Worker support and HTTPS
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