update: replace Draw with Paint image editor

- Remove Draw tool (whiteboard/diagrams)
- Add Paint image editor (paint.kit.pivoine.art)
- Features: multi-layer canvas, drawing tools, 50+ filters
- Inspired by miniPaint, built with modern web technologies
- Update icon to paintbrush
- Keep gradient-pink-rose styling

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

README.md

@@ -135,7 +135,7 @@ Tailwind CSS 4 uses a new CSS-first configuration approach:
 - **Pastel** - Modern color manipulation toolkit with palette generation and accessibility testing
 - **Audio** - Professional browser-based audio editor with multi-track editing, effects, and analysis (WAV, MP3, OGG, FLAC export)
 - **Units** - Smart unit converter with 187 units across 23 categories (length, mass, temperature, etc.)
-- **Draw** - Virtual whiteboard for sketching hand-drawn style diagrams (flowcharts, wireframes, collaborative editing)
+- **Paint** - Modern browser-based image editor with multi-layer canvas, drawing tools, and 50+ filters (inspired by miniPaint)
 - **Figlet** - ASCII art text generator with 373 fonts (text banners, terminal art, retro designs)
 
 ## CI/CD Pipeline