Keyboard Shortcuts:
- Create useKeyboardShortcuts hook with configurable shortcuts
- Support Ctrl/Cmd, Alt, Shift modifiers
- Add 7 global shortcuts (New note, Search, Quick capture, etc.)
- Create KeyboardShortcutsHelp modal with categorized shortcuts
- Show formatted shortcut keys (⌘ on Mac, Ctrl on Windows)
- Press ? to open shortcuts help
Statistics Dashboard:
- Create StatsDashboard component with productivity metrics
- Calculate productivity score (0-100) based on completion rate
- Show notes statistics (total, active, archived, priority)
- Display todos statistics with completion rate
- Track content stats (notes with todos/images/files, unique tags)
- Show recent activity (notes updated in last 7 days)
- Visual progress bar for productivity score
- Integrate dashboard in left column below calendar
