- Add React.memo() to ModRow, ContentPackRow, CapeItemDisplay, and CapeCard
- Optimize callback functions with useCallback in ModsTab
- Prevent unnecessary re-renders in virtualized lists
- Improve performance for large mod and cape collections

Components optimized:
- ModRow: Prevents re-renders when mod list updates
- ContentPackRow: Optimizes resource pack rendering
- CapeItemDisplay: Reduces cape list rendering overhead
- CapeCard: Improves cape browser performance
- ModsTab: Stabilizes callback references with useCallback

Expected performance improvements:
- Reduced CPU usage during list scrolling
- Fewer memory allocations from stable references
- Smoother UI interactions in profile management