PWA Offline Sync Manager

Summary

Implement Background Sync API to queue and replay mutations when connectivity is restored.

Key Capabilities

• Intercept failed requests.
• Queue mutations in IndexedDB.
• Replay on connection restoral.

PhD-Level Challenges

• Handle conflict resolution.
• Manage persistent queue order.
• Provide user feedback.

Acceptance Criteria

• Queue a mutation offline.
• Sync automatically when online.
• Handle a conflict scenario.