style: apply dart format across project

lib/widgets/detail/detail_url_section.dart

@@ -81,7 +81,7 @@ class DetailUrlSection extends StatelessWidget {
                   ],
                 ),
                 const SizedBox(height: 20),
-                
+
                 // URL 입력 필드
                 BaseTextField(
                   controller: controller.websiteUrlController,
@@ -94,7 +94,7 @@ class DetailUrlSection extends StatelessWidget {
                     color: AppColors.navyGray,
                   ),
                 ),
-                
+
                 // 해지 안내 섹션
                 if (controller.subscription.websiteUrl != null &&
                     controller.subscription.websiteUrl!.isNotEmpty) ...[
@@ -151,7 +151,7 @@ class DetailUrlSection extends StatelessWidget {
                     ),
                   ),
                 ],
-                
+
                 // URL 자동 매칭 정보
                 if (controller.websiteUrlController.text.isEmpty) ...[
                   const SizedBox(height: 16),
@@ -194,4 +194,4 @@ class DetailUrlSection extends StatelessWidget {
       ),
     );
   }
-}
+}