Guidart: Guided Sketching Draw

Automated Eraser Tracing & Animation: Added automatic line tracing and step animations for eraser steps. Pixel transitions and noise filtering have been optimized for smooth eraser paths. Accurate Pencil Tip Positioning: Improved guide accuracy by calculating and applying a precise pencil tip offset, ensuring the reveal mask aligns perfectly with your pencil strokes. Otsu Binarization for Line Detection: Integrated Otsu adaptive thresholding and spatial noise filtering for dynamic background removal, significantly improving stroke detection and path generation under different lighting. Performance Improvements: Optimized calculations for mask dimensions and blur values to reduce memory and CPU usage during canvas drawing animations.