Major Changes:
- Switch from Nextcloud Notes API to direct WebDAV file access
- Notes stored as .txt files with filename-based IDs for reliability
- Implement safer sync strategy without clearNotes() to prevent data loss
- Add ETag-based conflict detection for concurrent edits
- Add category color sync to .category-colors.json on server
- Show neutral gray badges for categories without assigned colors
Technical Improvements:
- Replace numeric IDs with filename-based string IDs
- Update Note type to support both number and string IDs
- Implement WebDAV methods: fetchNotesWebDAV, createNoteWebDAV, updateNoteWebDAV, deleteNoteWebDAV
- Add CategoryColorsSync service for server synchronization
- Remove hash-based color fallback (only show colors when explicitly set)
Bug Fixes:
- Fix category badge rendering to show all categories
- Prevent note loss during sync operations
- Improve offline-first functionality with better merge strategy
- Add IndexedDB storage layer for notes (src/db/localDB.ts)
- Implement sync manager with queue and conflict resolution (src/services/syncManager.ts)
- Add online/offline detection hook (src/hooks/useOnlineStatus.ts)
- Load notes from local storage immediately on app startup
- Add sync status UI indicators (offline badge, pending count)
- Auto-sync every 5 minutes when online
- Queue operations when offline, sync when connection restored
- Fix note content update when synced from server while viewing
- Retry failed sync operations up to 5 times
- Temporary IDs for offline-created notes
