- Added new test excalidraw page component and route with deep linking via ?tests=excalidraw
- Enhanced drawings editor to preserve frontmatter and normalize metadata when saving .excalidraw.md files
- Improved excalidraw file handling with better error handling and sanitization
- Updated sidebar and navigation to include test excalidraw option
- Fixed collaborators map serialization issue in excalidraw scene data
- Updated workspace state to open new Excalidraw drawing instead of empty tab
- Removed test-drawing.excalidraw.md file that's no longer needed
- Added Excalidraw plugin to command palette shortcuts
- Updated lastOpenFiles list to include new drawing files
