style: apply dart format across project

lib/widgets/common/buttons/danger_button.dart

@@ -39,7 +39,7 @@ class DangerButton extends StatefulWidget {
 
 class _DangerButtonState extends State<DangerButton> {
   bool _isHovered = false;
-  
+
   static const Color _dangerColor = AppColors.dangerColor;
 
   Future<void> _handlePress() async {
@@ -74,8 +74,7 @@ class _DangerButtonState extends State<DangerButton> {
               ),
               const SizedBox(height: 16),
               Text(
-                widget.confirmationMessage ?? 
-                '이 작업은 되돌릴 수 없습니다.\n계속하시겠습니까?',
+                widget.confirmationMessage ?? '이 작업은 되돌릴 수 없습니다.\n계속하시겠습니까?',
                 textAlign: TextAlign.center,
                 style: const TextStyle(
                   fontSize: 16,
@@ -171,4 +170,4 @@ class _DangerButtonState extends State<DangerButton> {
 
     return button;
   }
-}
+}