feat: Comprehensively enhance landing page UI with modern design and improved UX

[RafiulM]

Summary

This PR comprehensively enhances the landing page UI with a modern, professional design that significantly improves user experience and engagement.

✨ Key Improvements

🎨 Visual Design

• Added sticky navigation with branded header and quick access links
• Redesigned hero section with enhanced visual hierarchy and gradient effects
• Implemented animated statistics cards that cycle through platform metrics
• Added comprehensive footer with organized links and branding

🔍 Search Experience

• Enhanced search bar with better styling and gradient effects
• Added popular search suggestions for improved discoverability
• Improved search input UX with better placeholder text and styling

📱 Content & Layout

• Created "How It Works" 3-step process section for clear value proposition
• Completely redesigned featured repositories with interactive cards and enhanced statistics
• Added detailed features section with hover effects and better descriptions
• Implemented call-to-action section with gradient background and dual CTAs
• Added social proof section with platform statistics and trust indicators

🎯 User Experience

• Improved mobile responsiveness across all sections
• Added smooth animations and transitions throughout
• Enhanced error and loading states for better feedback
• Maintained accessibility standards with proper ARIA attributes

🛠️ Technical Improvements

• Fixed ESLint warnings and TypeScript errors
• Optimized component structure and performance
• Added proper semantic HTML and accessibility features

📈 Impact

• Significantly improved landing page conversion potential
• Enhanced user engagement with interactive elements
• Better brand presentation and professional appearance
• Improved accessibility and mobile experience

🧪 Testing

• ✅ Linting passes (with minor warnings in other files)
• ✅ Type checking passes
• ✅ Build compilation successful
• ✅ Responsive design tested across breakpoints
• ✅ Dark mode compatibility maintained

🤖 Generated with Claude Code