feat(app): add manual entry and sharing flows

lib/core/widgets/error_widget.dart

@@ -3,18 +3,18 @@ import '../constants/app_colors.dart';
 import '../constants/app_typography.dart';
 
 /// 커스텀 에러 위젯
-/// 
+///
 /// Flutter의 기본 ErrorWidget과 이름 충돌을 피하기 위해 CustomErrorWidget으로 명명
 class CustomErrorWidget extends StatelessWidget {
   /// 에러 메시지
   final String message;
-  
+
   /// 에러 아이콘 (선택사항)
   final IconData? icon;
-  
+
   /// 재시도 버튼 콜백 (선택사항)
   final VoidCallback? onRetry;
-  
+
   /// 상세 에러 메시지 (선택사항)
   final String? details;
 
@@ -29,7 +29,7 @@ class CustomErrorWidget extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final isDark = Theme.of(context).brightness == Brightness.dark;
-    
+
     return Center(
       child: Padding(
         padding: const EdgeInsets.all(24.0),
@@ -44,14 +44,14 @@ class CustomErrorWidget extends StatelessWidget {
               color: isDark ? AppColors.darkError : AppColors.lightError,
             ),
             const SizedBox(height: 16),
-            
+
             // 에러 메시지
             Text(
               message,
               style: AppTypography.heading2(isDark),
               textAlign: TextAlign.center,
             ),
-            
+
             // 상세 메시지 (있을 경우)
             if (details != null) ...[
               const SizedBox(height: 8),
@@ -61,7 +61,7 @@ class CustomErrorWidget extends StatelessWidget {
                 textAlign: TextAlign.center,
               ),
             ],
-            
+
             // 재시도 버튼 (있을 경우)
             if (onRetry != null) ...[
               const SizedBox(height: 24),
@@ -70,8 +70,8 @@ class CustomErrorWidget extends StatelessWidget {
                 icon: const Icon(Icons.refresh),
                 label: const Text('다시 시도'),
                 style: ElevatedButton.styleFrom(
-                  backgroundColor: isDark 
-                      ? AppColors.darkPrimary 
+                  backgroundColor: isDark
+                      ? AppColors.darkPrimary
                       : AppColors.lightPrimary,
                   foregroundColor: Colors.white,
                   padding: const EdgeInsets.symmetric(
@@ -96,21 +96,16 @@ void showErrorSnackBar({
   SnackBarAction? action,
 }) {
   final isDark = Theme.of(context).brightness == Brightness.dark;
-  
+
   ScaffoldMessenger.of(context).showSnackBar(
     SnackBar(
-      content: Text(
-        message,
-        style: const TextStyle(color: Colors.white),
-      ),
+      content: Text(message, style: const TextStyle(color: Colors.white)),
       backgroundColor: isDark ? AppColors.darkError : AppColors.lightError,
       duration: duration,
       action: action,
       behavior: SnackBarBehavior.floating,
-      shape: RoundedRectangleBorder(
-        borderRadius: BorderRadius.circular(8),
-      ),
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
       margin: const EdgeInsets.all(8),
     ),
   );
-}
+}