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/navigation/app_navigation_observer.dart

@@ -0,0 +1,79 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import '../providers/navigation_provider.dart';
+
+class AppNavigationObserver extends NavigatorObserver {
+  @override
+  void didPush(Route<dynamic> route, Route<dynamic>? previousRoute) {
+    super.didPush(route, previousRoute);
+    _updateNavigationState(route);
+    debugPrint('Navigation: Push ${route.settings.name}');
+  }
+
+  @override
+  void didPop(Route<dynamic> route, Route<dynamic>? previousRoute) {
+    super.didPop(route, previousRoute);
+    if (previousRoute != null) {
+      _updateNavigationState(previousRoute);
+    } else {
+      // 이전 라우트가 없으면 Provider의 히스토리를 사용
+      _handlePopWithProvider();
+    }
+    debugPrint('Navigation: Pop ${route.settings.name}');
+  }
+
+  @override
+  void didRemove(Route<dynamic> route, Route<dynamic>? previousRoute) {
+    super.didRemove(route, previousRoute);
+    if (previousRoute != null) {
+      _updateNavigationState(previousRoute);
+    }
+    debugPrint('Navigation: Remove ${route.settings.name}');
+  }
+
+  @override
+  void didReplace({Route<dynamic>? newRoute, Route<dynamic>? oldRoute}) {
+    super.didReplace(newRoute: newRoute, oldRoute: oldRoute);
+    if (newRoute != null) {
+      _updateNavigationState(newRoute);
+    }
+    debugPrint('Navigation: Replace ${oldRoute?.settings.name} with ${newRoute?.settings.name}');
+  }
+
+  void _updateNavigationState(Route<dynamic> route) {
+    if (navigator?.context == null) return;
+    
+    final routeName = route.settings.name;
+    if (routeName == null) return;
+    
+    // build 완료 후 업데이트하도록 변경
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (navigator?.context == null) return;
+      
+      try {
+        final context = navigator!.context;
+        final navigationProvider = Provider.of<NavigationProvider>(context, listen: false);
+        navigationProvider.updateByRoute(routeName);
+      } catch (e) {
+        debugPrint('Failed to update navigation state: $e');
+      }
+    });
+  }
+
+  void _handlePopWithProvider() {
+    if (navigator?.context == null) return;
+    
+    // build 완료 후 업데이트하도록 변경
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (navigator?.context == null) return;
+      
+      try {
+        final context = navigator!.context;
+        final navigationProvider = Provider.of<NavigationProvider>(context, listen: false);
+        navigationProvider.pop();
+      } catch (e) {
+        debugPrint('Failed to handle pop with provider: $e');
+      }
+    });
+  }
+}