UI Improvements: - Style scrollbars with primary color accent - Scrollbar thumb transitions on hover (40% → 60% → 80% opacity) - Add fill tool options to toolbar (color picker + opacity) - Support for Firefox with scrollbar-color property Transparency Support: - Set default canvas background to transparent - First layer now transparent instead of white fill - Enables creating images with transparency - Checkerboard pattern shows through transparent areas - Proper PNG export support with alpha channel 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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