🎯 Major Improvements:
- Fixed KPI filter functionality (yearly/monthly/weekly/today/custom)
- Added comprehensive tooltips for user names and performance metrics
- Made Top 5 Performers section responsive and compact
- Improved visual design with gradient backgrounds and better spacing
- Added performance score breakdown tooltips
- Enhanced mobile responsiveness

🔧 Technical Fixes:
- Fixed filter value mapping between Select component and API calls
- Corrected initial state from 'Monthly' to 'month'
- Updated useEffect dependencies for proper KPI data loading
- Added proper imports for Select and Input components

📱 UI/UX Enhancements:
- Compact card layout similar to Team Dashboard
- Color-coded performance metrics with gradients
- Professional loading and empty states
- Better responsive breakpoints for mobile/tablet/desktop
- Enhanced accessibility with cursor-help indicators

🎨 Visual Improvements:
- Medal badges for top 3 performers (🥇🥈🥉)
- Gradient avatars and rank indicators
- Improved typography and spacing
- Better color contrast and readability