Major UI/UX and architecture improvements

- Implemented new navigation system with NavigationProvider and route management
- Added adaptive theme system with ThemeProvider for better theme handling
- Introduced glassmorphism design elements (app bars, scaffolds, cards)
- Added advanced animations (spring animations, page transitions, staggered lists)
- Implemented performance optimizations (memory manager, lazy loading)
- Refactored Analysis screen into modular components
- Added floating navigation bar with haptic feedback
- Improved subscription cards with swipe actions
- Enhanced skeleton loading with better animations
- Added cached network image support
- Improved overall app architecture and code organization

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/theme/app_theme.dart

@@ -21,7 +21,7 @@ class AppTheme {
     cardTheme: CardTheme(
       color: AppColors.cardColor,
       elevation: 1,
-      shadowColor: Colors.black.withOpacity(0.04),
+      shadowColor: Colors.black.withValues(alpha: 0.04),
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(16),
         side: BorderSide(color: AppColors.borderColor, width: 0.5),
@@ -265,7 +265,7 @@ class AppTheme {
       }),
       trackColor: MaterialStateProperty.resolveWith<Color>((states) {
         if (states.contains(MaterialState.selected)) {
-          return AppColors.primaryColor.withOpacity(0.5);
+          return AppColors.primaryColor.withValues(alpha: 0.5);
         }
         return AppColors.borderColor;
       }),
@@ -300,7 +300,7 @@ class AppTheme {
       activeTrackColor: AppColors.primaryColor,
       inactiveTrackColor: AppColors.borderColor,
       thumbColor: AppColors.primaryColor,
-      overlayColor: AppColors.primaryColor.withOpacity(0.2),
+      overlayColor: AppColors.primaryColor.withValues(alpha: 0.2),
       trackHeight: 4,
       thumbShape: const RoundSliderThumbShape(enabledThumbRadius: 10),
       overlayShape: const RoundSliderOverlayShape(overlayRadius: 20),