Add single node resizing #5
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This commit adds resize controls to selected elements in the canvas: 1. Added a new resize.rs module with: - ResizeHandle enum to represent the four corner positions - ResizeOperation struct to track resize state - ResizeConfig to manage resize options (aspect ratio, resize from center) 2. Extended the DragType enum to add a Resize variant 3. Added visual resize handles: - Drew 7px square handles at each corner of a selected element - Handles have white background with selection-colored borders 4. Implemented resize functionality: - Added hit detection for resize handles - Implemented standard corner resizing - Added support for Shift+drag to preserve aspect ratio - Added support for Option+drag to resize from center - Made resize operations non-destructive until mouse release The resize controls only appear when a single element is selected.
1. First pass: Draw all nodes and hover effects 2. Second pass: Draw selection outlines and resize handles 1. Third pass: Draw the group selection outline
- Clarify non-obvious behaviors like subpixel alignment
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Note: Resizing for multiple nodes at the same time isn't implemented yet