- Introduced new properties `showTraversalTime` and `traversalSpeedProfile` to the FreeDrawing class.
- Updated JSON serialization and deserialization to handle the new properties.
- Enhanced DrawingProvider and PenProvider to support traversal time settings.
- Implemented a traversal time overlay in the DrawingPainter for visual feedback on traversal duration.
- Refactored related UI components to integrate traversal time features seamlessly.