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/providers/navigation_provider.dart

@@ -0,0 +1,106 @@
+import 'package:flutter/material.dart';
+
+class NavigationProvider extends ChangeNotifier {
+  int _currentIndex = 0;
+  final List<int> _navigationHistory = [0];
+  String _currentRoute = '/';
+  String _currentTitle = '홈';
+
+  int get currentIndex => _currentIndex;
+  List<int> get navigationHistory => List.unmodifiable(_navigationHistory);
+  String get currentRoute => _currentRoute;
+  String get currentTitle => _currentTitle;
+
+  static const Map<String, int> routeToIndex = {
+    '/': 0,
+    '/add-subscription': -1,
+    '/sms-scanner': 3,
+    '/analysis': 1,
+    '/settings': 4,
+    '/subscription-detail': -1,
+  };
+
+  static const Map<int, String> indexToRoute = {
+    0: '/',
+    1: '/analysis',
+    3: '/sms-scanner',
+    4: '/settings',
+  };
+
+  static const Map<int, String> indexToTitle = {
+    0: '홈',
+    1: '분석',
+    3: 'SMS 스캔',
+    4: '설정',
+  };
+
+  void updateCurrentIndex(int index, {bool addToHistory = true}) {
+    if (_currentIndex == index) return;
+    
+    _currentIndex = index;
+    _currentRoute = indexToRoute[index] ?? '/';
+    _currentTitle = indexToTitle[index] ?? '홈';
+    
+    if (addToHistory && index >= 0) {
+      _navigationHistory.add(index);
+      if (_navigationHistory.length > 10) {
+        _navigationHistory.removeAt(0);
+      }
+    }
+    
+    notifyListeners();
+  }
+
+  void updateByRoute(String route) {
+    final index = routeToIndex[route] ?? 0;
+    _currentRoute = route;
+    
+    if (index >= 0) {
+      _currentIndex = index;
+      _currentTitle = indexToTitle[index] ?? '홈';
+    } else {
+      switch (route) {
+        case '/add-subscription':
+          _currentTitle = '구독 추가';
+          break;
+        case '/subscription-detail':
+          _currentTitle = '구독 상세';
+          break;
+        default:
+          _currentTitle = '홈';
+      }
+    }
+    
+    notifyListeners();
+  }
+
+  bool canPop() {
+    return _navigationHistory.length > 1;
+  }
+
+  void pop() {
+    if (_navigationHistory.length > 1) {
+      _navigationHistory.removeLast();
+      final previousIndex = _navigationHistory.last;
+      updateCurrentIndex(previousIndex, addToHistory: false);
+    }
+  }
+
+  void reset() {
+    _currentIndex = 0;
+    _currentRoute = '/';
+    _currentTitle = '홈';
+    _navigationHistory.clear();
+    _navigationHistory.add(0);
+    notifyListeners();
+  }
+
+  void clearHistoryAndGoHome() {
+    _currentIndex = 0;
+    _currentRoute = '/';
+    _currentTitle = '홈';
+    _navigationHistory.clear();
+    _navigationHistory.add(0);
+    notifyListeners();
+  }
+}