style: apply dart format across project

lib/widgets/dialogs/delete_confirmation_dialog.dart

@@ -56,7 +56,7 @@ class DeleteConfirmationDialog extends StatelessWidget {
                         ),
                       ),
                       const SizedBox(height: 24),
-                      
+
                       // 타이틀
                       const Text(
                         '구독 삭제',
@@ -67,7 +67,7 @@ class DeleteConfirmationDialog extends StatelessWidget {
                         ),
                       ),
                       const SizedBox(height: 12),
-                      
+
                       // 설명
                       RichText(
                         textAlign: TextAlign.center,
@@ -91,7 +91,7 @@ class DeleteConfirmationDialog extends StatelessWidget {
                         ),
                       ),
                       const SizedBox(height: 8),
-                      
+
                       // 경고 메시지
                       Container(
                         padding: const EdgeInsets.symmetric(
@@ -127,7 +127,7 @@ class DeleteConfirmationDialog extends StatelessWidget {
                         ),
                       ),
                       const SizedBox(height: 32),
-                      
+
                       // 버튼들
                       Row(
                         children: [
@@ -176,7 +176,7 @@ class DeleteConfirmationDialog extends StatelessWidget {
         serviceName: serviceName,
       ),
     );
-    
+
     return result ?? false;
   }
-}
+}