feat(web): Tailwind CSS v4, UI component library, responsive design
- Install Tailwind CSS v4 with @tailwindcss/postcss, clsx, tailwind-merge, lucide-react
- Create design token system in globals.css (@theme block)
- Create cn() utility for conditional Tailwind class merging
- Build 9 base UI components: Button, Input, Textarea, Select, Card, Badge, FormGroup, Modal, Skeleton
- Refactor all pages to use Tailwind classes and UI components (remove all inline styles)
- Add responsive sidebar with mobile hamburger menu overlay
- Add responsive grid layouts (1-col mobile, 2-col tablet, 3-col desktop)
- Replace unicode icons with lucide-react icons
- Add loading skeletons for dashboard and project detail pages
- Add Rust agent build script (build.ps1) and Cargo.lock
Refs #155, #156, #157
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
claude
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