- Simplified useRealtimeSync to use router.refresh() polling
- Created RealtimeUpdater component for easy integration
- Added real-time updates to home page (3s polling)
- Fixed DeleteItemButton to properly reset state on error
- Updates now refresh every 3 seconds and on window focus
- Changes from other users/browsers will appear quickly
- Add useRealtimeSync hook for polling server updates every 3 seconds
- Create API endpoint to check last updated timestamp for lists
- Integrate real-time sync into ListDetailView component
- Automatically refresh when other users make changes to shared lists
- Poll on interval and when page becomes visible again
