- Add WebSocket message handler for mermaid_convert type
- Make handleWebSocketMessage async to support conversion
- Add automatic backend sync after diagram generation
- Integrate convertMermaidToExcalidraw utility
- Remove test button and handleMermaidTest function
- Fix: Add missing Excalidraw CSS import for proper UI rendering
- Enhance server endpoint with WebSocket broadcast support
- Add mermaid_convert to WebSocketMessageType union