feat: UI overhaul and enhanced UX

[NotShrirang]

This commit introduces a comprehensive redesign of the repository viewer with modern styling, improved navigation, and enhanced user experience.

Key Changes

Design & Styling

• Modern gradient-based color scheme with CSS custom properties
• Enhanced typography using Inter and JetBrains Mono fonts
• Sophisticated visual effects including animated backgrounds and smooth transitions
• Comprehensive dark code themes with syntax highlighting improvements

Navigation & Layout

• Restructured sidebar with hierarchical directory tree visualization
• File type icons for better visual recognition
• Improved mobile responsiveness with collapsible sidebar
• Enhanced table of contents with nested directory structure

User Experience

• Smooth view transitions between Human and LLM modes
• One-click copy functionality for code blocks
• Auto-text selection in LLM view for easier copying
• Keyboard shortcuts (Alt+1/2 for view switching)
• Loading animations and scroll-based fade-in effects

Mobile Support

• Full responsive design with mobile-first approach
• Touch-friendly navigation with overlay sidebar
• Optimized layouts for various screen sizes
• Mobile-specific navigation controls

Code Quality

• Improved accessibility with semantic HTML
• Better error handling and fallback mechanisms
• Enhanced code organization and maintainability

Technical Details

• Added 1,470 lines of enhanced CSS with modern design patterns
• Implemented JavaScript for interactive features and animations
• Maintained backward compatibility while adding new functionality
• Optimized performance with efficient DOM manipulation

This update transforms the basic repository viewer into a modern, professional-grade tool with significantly improved usability and visual appeal.

This is completely vibe-coded.

[NotShrirang]

• Introduces advanced repository statistics, export controls, and interactive JavaScript features (search, breadcrumbs, line numbers, content analysis) to the generated HTML. Refactors file section headers for better layout and updates copy button placement and styling.

• Enhances user experience and provides more insights into repository structure and contents.