Add detailed implementation plan covering:
- Innovative UX features (real-time conversion, visual comparison, power user features)
- Technical architecture with Next.js 16, TypeScript, and Tailwind CSS 4
- Component structure and state management design
- 8-phase implementation roadmap
- Design system with category-based color palette
- Support for 13+ unit categories from convert-units library
- Performance targets and accessibility requirements
- Mobile-first responsive design strategy
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
