This commit transforms the app into a production-ready application with
modern design patterns, smooth animations, and optimized performance.

## New Features

### Theme System (app_theme.dart)
- Centralized design tokens (colors, spacing, typography)
- Professional color palette with primary/accent colors
- Three-tier shadow system for depth
- Standardized animation durations and curves
- Reusable decoration utilities

### Custom Page Transitions (page_transitions.dart)
- Smooth slide, fade, and scale transitions
- Material Design 3 shared axis transitions
- Hero-style transitions for special screens
- Consistent 300ms durations with cubic easing

## Enhanced Components

### Home Screen
- Staggered button animations (1200ms total)
- Modern gradient buttons with icons
- Scale feedback on press (95% scale)
- Shader mask on background for better contrast
- Animated language switcher

### Game Home Page
- Enhanced game cards with modern gradients
- Better lock/unlock visual states
- Integrated score display
- Larger icons (60-70px) with shadows
- Gold accent color for level badges
- Smooth press animations

### Learn Menu Page
- Redesigned menu items with icon + label + arrow layout
- Left-aligned text for better readability
- Icon backgrounds for visual interest
- Gradient backgrounds matching theme
- Press feedback animations

### Route Generator
- All routes use custom smooth transitions
- Appropriate transition types per route
- Consistent animation timing

## Performance Optimizations

- Const constructors throughout
- Proper animation controller disposal
- Efficient widget rebuilds
- Hardware-accelerated transforms
- Minimal animation durations (200-300ms)

## Technical Details

- Animation system with SingleTickerProviderStateMixin
- Staggered animations with interval curves
- Press state management for visual feedback
- Gradient backgrounds for modern look
- Professional shadow system
- Consistent spacing with design tokens

## Files Modified

- NEW: lib/util/app_theme.dart
- NEW: lib/util/page_transitions.dart
- NEW: ENHANCEMENTS.md
- MODIFIED: lib/presentation/home.dart
- MODIFIED: lib/presentation/game/game_home_page.dart
- MODIFIED: lib/presentation/learn/learn_menu_page.dart
- MODIFIED: lib/util/route_generator.dart

See ENHANCEMENTS.md for complete documentation.