Move engine (scene-graph, renderer, layout, codec, kiwi) into
packages/core/ as a Bun workspace package. The app's src/engine/
files become thin re-export shims so all existing imports still work.
- Bun workspace with packages/core
- Zero DOM dependencies in core
- Headless-friendly CanvasKit init (locateFile option)
- Constants split: engine constants in core, UI constants in app
- All 76 unit tests pass, lint + typecheck clean, vite build works
Full Figma-compatible vector network: vertices, segments (cubic
bezier with tangent offsets), and regions (filled closed paths).
Pen tool interaction:
- Click to place vertices, click+drag to set bezier tangent handles
- Click first vertex to close path (with visual highlight)
- Enter to commit open path, Escape to cancel
- Preview line from last vertex to cursor
- Tangent handle visualization (lines + control points)
Rendering:
- Vector nodes rendered via CanvasKit Path API
- Converts vector network to path: regions as closed fills,
segments as open strokes
- Proper cubic bezier from tangentStart/tangentEnd offsets
Data model:
- VectorNetwork, VectorVertex, VectorSegment, VectorRegion types
- vectorNetwork field on SceneNode (nullable)
- computeVectorBounds for node sizing
- HandleMirroring enum for future handle behavior
