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/widgets/empty_state_widget.dart

@@ -1,6 +1,8 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'dart:math' as math;
+import 'glassmorphism_card.dart';
+import 'themed_text.dart';
 
 /// 구독이 없을 때 표시되는 빈 화면 위젯
 ///
@@ -31,21 +33,10 @@ class EmptyStateWidget extends StatelessWidget {
             end: Offset.zero,
           ).animate(CurvedAnimation(
               parent: slideController, curve: Curves.easeOutBack)),
-          child: Container(
+          child: GlassmorphismCard(
+            width: null,
             margin: const EdgeInsets.all(16),
             padding: const EdgeInsets.all(32),
-            decoration: BoxDecoration(
-              color: Colors.white,
-              borderRadius: BorderRadius.circular(24),
-              boxShadow: [
-                BoxShadow(
-                  color: Colors.grey.withOpacity(0.08),
-                  spreadRadius: 0,
-                  blurRadius: 16,
-                  offset: const Offset(0, 8),
-                ),
-              ],
-            ),
             child: Column(
               mainAxisSize: MainAxisSize.min,
               children: [
@@ -65,7 +56,7 @@ class EmptyStateWidget extends StatelessWidget {
                           borderRadius: BorderRadius.circular(16),
                           boxShadow: [
                             BoxShadow(
-                              color: const Color(0xFF3B82F6).withOpacity(0.3),
+                              color: const Color(0xFF3B82F6).withValues(alpha: 0.3),
                               spreadRadius: 0,
                               blurRadius: 16,
                               offset: const Offset(0, 8),
@@ -82,29 +73,17 @@ class EmptyStateWidget extends StatelessWidget {
                   },
                 ),
                 const SizedBox(height: 32),
-                ShaderMask(
-                  shaderCallback: (bounds) => const LinearGradient(
-                    colors: [Color(0xFF3B82F6), Color(0xFF0EA5E9)],
-                    begin: Alignment.topLeft,
-                    end: Alignment.bottomRight,
-                  ).createShader(bounds),
-                  child: const Text(
-                    '등록된 구독이 없습니다',
-                    style: TextStyle(
-                      fontSize: 22,
-                      fontWeight: FontWeight.w800,
-                      color: Colors.white,
-                      letterSpacing: -0.5,
-                    ),
-                  ),
+                const ThemedText(
+                  '등록된 구독이 없습니다',
+                  fontSize: 22,
+                  fontWeight: FontWeight.w800,
+                  letterSpacing: -0.5,
                 ),
                 const SizedBox(height: 8),
-                const Text(
+                const ThemedText(
                   '새로운 구독을 추가해보세요',
-                  style: TextStyle(
-                    fontSize: 16,
-                    color: Color(0xFF64748B),
-                  ),
+                  fontSize: 16,
+                  opacity: 0.7,
                 ),
                 const SizedBox(height: 32),
                 MouseRegion(
@@ -133,6 +112,7 @@ class EmptyStateWidget extends StatelessWidget {
                         fontSize: 16,
                         fontWeight: FontWeight.w600,
                         letterSpacing: 0.5,
+                        color: Colors.white,
                       ),
                     ),
                   ),