- Add "Last Visited" section to Dashboard showing recent board visits
- Add per-board activity logging that tracks shape creates/deletes/updates
- Activity panel with collapsible sidebar, grouped by date
- Debounced update logging to skip tiny movements
- Full dark mode support for both features
New files:
- src/lib/visitedBoards.ts - Visit tracking service
- src/lib/activityLogger.ts - Activity logging service
- src/components/ActivityPanel.tsx - Activity panel UI
- src/css/activity-panel.css - Activity panel styles
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
