Highlights:
- Per-event user membership with access control
- Bilingual UI (English / 繁體中文)
- Theme switcher with dark mode default
- Unified page layout & portal-based modal
- Native BarcodeDetector QR scanner
- Item created/updated timestamps
- Many cache invalidation and deleted-record handling fixes
- Settings cleanup (API URL field removed, Slack redirect auto-derived)
- Backup format bumped to 1.3 (now includes EventMember)