Add offline-first data sync capabilities

Task

Implement offline-first architecture with background sync

Requirements

• Setup local database (WatermelonDB or Realm)
• Implement sync queue for offline actions
• Background sync when network available
• Conflict resolution strategy
• User feedback for sync status

Technical Approach

• Use Redux Offline or custom middleware
• Implement optimistic UI updates
• Queue failed requests for retry

Edge Cases

• Handle network interruptions gracefully
• Merge conflicts from concurrent edits
• Storage quota management

Estimated effort

1.5 weeks