style: dart format 적용

- 전체 Dart 소스 및 테스트 파일 포매팅 통일
- trailing comma, 줄바꿈, 인덴트 정리

lib/src/features/game/widgets/death_overlay.dart

@@ -333,7 +333,8 @@ class DeathOverlay extends StatelessWidget {
                         TextSpan(
                           children: [
                             TextSpan(
-                              text: '[${_getSlotName(deathInfo.lostItemSlot)}] ',
+                              text:
+                                  '[${_getSlotName(deathInfo.lostItemSlot)}] ',
                               style: TextStyle(color: muted),
                             ),
                             TextSpan(
@@ -485,7 +486,10 @@ class DeathOverlay extends StatelessWidget {
           border: Border(
             top: BorderSide(color: gold, width: 3),
             left: BorderSide(color: gold, width: 3),
-            bottom: BorderSide(color: goldDark.withValues(alpha: 0.8), width: 3),
+            bottom: BorderSide(
+              color: goldDark.withValues(alpha: 0.8),
+              width: 3,
+            ),
             right: BorderSide(color: goldDark.withValues(alpha: 0.8), width: 3),
           ),
         ),
@@ -495,10 +499,7 @@ class DeathOverlay extends StatelessWidget {
             Row(
               mainAxisAlignment: MainAxisAlignment.center,
               children: [
-                Text(
-                  '✨',
-                  style: TextStyle(fontSize: 20, color: gold),
-                ),
+                Text('✨', style: TextStyle(fontSize: 20, color: gold)),
                 const SizedBox(width: 8),
                 Text(
                   l10n.deathAdRevive.toUpperCase(),
@@ -551,7 +552,8 @@ class DeathOverlay extends StatelessWidget {
                   _buildBenefitRow(
                     context,
                     icon: '🔄',
-                    text: '${l10n.deathAdReviveItem}: ${deathInfo.lostItemName}',
+                    text:
+                        '${l10n.deathAdReviveItem}: ${deathInfo.lostItemName}',
                     color: itemRarityColor,
                   ),
                   const SizedBox(height: 4),