Font loading:
- Inter Regular font bundled (342KB TTF)
- TypefaceFontProvider for Paragraph API
- MakeFreeTypeFaceFromData for Font object
- Fonts load async, fallback to drawText before ready
Text rendering:
- ParagraphBuilder with font family, size, letter spacing,
line height, text alignment
- Multi-line text wraps to node width
- Text nodes render at correct position in local space
Inline editing:
- Double-click text node → HTML textarea overlay
- Positioned/sized to match node on canvas (zoom-aware)
- Live updates to scene graph on input
- Escape or blur commits edit
- Keyboard events stop propagation during editing
- Text cursor for TEXT tool
