Initial commit: Tauri + CanvasKit + React editor scaffold
- Tauri v2 desktop shell with 1280x800 window
- CanvasKit WASM (Skia) rendering via WebGL2
- Scene graph with typed nodes (Frame, Rectangle, Ellipse, Line, etc.)
- Skia renderer with fills, strokes, rounded corners, opacity, rotation
- Selection system with resize handles
- Undo/redo manager (inverse command pattern with batching)
- Bottom toolbar (Select, Frame, Rect, Ellipse, Line) matching Figma UI3
- Left layers panel, right properties panel
- Pan (scroll), zoom (Ctrl+scroll toward cursor)
- Keyboard shortcuts: V/F/R/O/L for tools, Cmd+Z undo, Backspace delete
- 5 demo shapes rendered on canvas
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