Features implemented:
- Visual node/edge editing with property panels
- Drag and drop node positioning
- Color customization for nodes and edges
- Text editing with real-time updates
- Bidirectional Mermaid code synchronization
- Subgraph/grouping support for layout control
- Export functionality to JSON with position data
- Layout lock system (experimental)
- Edge label editing and styling
- Comprehensive Mermaid syntax parser
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
