Refactor screens to MVC architecture with modular widgets

- Extract business logic from screens into dedicated controllers
- Split large screen files into smaller, reusable widget components
- Add controllers for AddSubscriptionScreen and DetailScreen
- Create modular widgets for subscription and detail features
- Improve code organization and maintainability
- Remove duplicated code and improve reusability

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

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

lib/widgets/home_content.dart

@@ -9,7 +9,6 @@ import '../widgets/subscription_list_widget.dart';
 import '../widgets/empty_state_widget.dart';
 import '../widgets/glassmorphic_app_bar.dart';
 import '../theme/app_colors.dart';
-import '../routes/app_routes.dart';
 
 class HomeContent extends StatelessWidget {
   final AnimationController fadeController;
@@ -73,8 +72,8 @@ class HomeContent extends StatelessWidget {
             pinned: true,
             expandedHeight: kToolbarHeight,
           ),
-          SliverToBoxAdapter(
-            child: NativeAdWidget(key: const ValueKey('home_ad')),
+          const SliverToBoxAdapter(
+            child: NativeAdWidget(key: ValueKey('home_ad')),
           ),
           SliverToBoxAdapter(
             child: SlideTransition(
@@ -119,14 +118,14 @@ class HomeContent extends StatelessWidget {
                       children: [
                         Text(
                           '${provider.subscriptions.length}개',
-                          style: TextStyle(
+                          style: const TextStyle(
                             fontSize: 14,
                             fontWeight: FontWeight.w600,
                             color: AppColors.primaryColor,
                           ),
                         ),
                         const SizedBox(width: 4),
-                        Icon(
+                        const Icon(
                           Icons.arrow_forward_ios,
                           size: 14,
                           color: AppColors.primaryColor,