- Updated DESIGN.md: rendering strategy (no backing bitmap, screen-space
grid, viewport clamping), added line snap and box tool documentation
- Updated PROGRESS.md: DC-1 testing results and fixes applied
- Updated CLAUDE.md: key conventions for rendering
- Fix toolbar overlap: use clipToBounds on canvas AndroidView to prevent
it from drawing over the toolbar area
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>