feat: UI revamp with modern components and public API integration

[icy-r]

Summary

Complete UI overhaul with modern components, smooth animations, and improved UX.

Key Changes

• 🎨 Migrated to @primer/react v37.31.0, framer-motion, and Radix UI
• ✨ Added smooth animations and page transitions
• 🌓 Enhanced theme support (light/dark mode)
• 📊 New components: LeaderboardTable, StatsDashboard, PRList/PRCard
• 📱 Responsive design with mobile-optimized layouts
• 🔄 Updated GitHub Pages workflow to latest action versions

API Integration

• Using GitHub public REST API (no backend auth required)
• PRs filtered to past 1 year only
• Auto-excludes dependabot PRs
• Rate limit: 60 requests/hour (unauthenticated)

Infrastructure Updates

• ✅ Updated all GitHub Actions to latest versions (v4)
• ✅ Fixed build output path for Vite (dist instead of build)
• ✅ Added pnpm caching for faster CI builds
• ✅ Improved security with --ignore-scripts flag

Testing

To test locally:

git checkout revamp
pnpm install
pnpm dev

Then open http://localhost:3000 to verify all UI changes work correctly.

Stats

• 32+ files changed
• Modern component architecture
• Improved performance with lazy loading
• Better accessibility and SEO