refactor: 타입 안전성 개선 및 하드코딩 문자열 l10n 적용

- return_rewards_dialog: _getRarityColor(dynamic) → ItemRarity? 타입 명시
- stats_section: 하드코딩된 Undo/Rolls 문자열을 l10n으로 교체
- game_text_l10n: uiUndoAndRolls, uiRollsOnly 추가 (한/영/일)
- skill_data: 주석 스킬 개수 70→68 수정

lib/data/game_text_l10n.dart

@@ -1021,6 +1021,13 @@ String uiRollHistory(int count) =>
     _l('$count roll(s) in history', '리롤 기록: $count회', 'リロール履歴: $count回');
 String get uiEnterName =>
     _l('Please enter a name.', '이름을 입력해주세요.', '名前を入力してください。');
+String uiUndoAndRolls(int undo, int rolls) => _l(
+  'Undo: $undo  |  Rolls: $rolls/5',
+  '되돌리기: $undo  |  굴리기: $rolls/5',
+  'やり直し: $undo  |  ロール: $rolls/5',
+);
+String uiRollsOnly(int rolls) =>
+    _l('Rolls: $rolls/5', '굴리기: $rolls/5', 'ロール: $rolls/5');
 String get uiTestMode => _l('Test Mode', '테스트 모드', 'テストモード');
 String get uiTestModeDesc =>
     _l('Use mobile layout on web', '웹에서 모바일 레이아웃 사용', 'Webでモバイルレイアウトを使用');

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

@@ -4,6 +4,7 @@ import 'package:asciineverdie/data/game_text_l10n.dart' as l10n;
 import 'package:asciineverdie/data/potion_data.dart';
 import 'package:asciineverdie/src/core/engine/iap_service.dart';
 import 'package:asciineverdie/src/core/engine/return_rewards_service.dart';
+import 'package:asciineverdie/src/core/model/item_stats.dart';
 import 'package:asciineverdie/src/core/model/treasure_chest.dart';
 import 'package:asciineverdie/src/shared/retro_colors.dart';
 
@@ -449,15 +450,14 @@ class _ReturnRewardsDialogState extends State<ReturnRewardsDialog>
     );
   }
 
-  Color _getRarityColor(dynamic rarity) {
-    if (rarity == null) return Colors.white;
-    return switch (rarity.toString()) {
-      'ItemRarity.common' => Colors.grey,
-      'ItemRarity.uncommon' => Colors.green,
-      'ItemRarity.rare' => Colors.blue,
-      'ItemRarity.epic' => Colors.purple,
-      'ItemRarity.legendary' => Colors.orange,
-      _ => Colors.white,
+  Color _getRarityColor(ItemRarity? rarity) {
+    return switch (rarity) {
+      null => Colors.white,
+      ItemRarity.common => Colors.grey,
+      ItemRarity.uncommon => Colors.green,
+      ItemRarity.rare => Colors.blue,
+      ItemRarity.epic => Colors.purple,
+      ItemRarity.legendary => Colors.orange,
     };
   }
 

lib/src/features/new_character/widgets/stats_section.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 
+import 'package:asciineverdie/data/game_text_l10n.dart' as game_l10n;
 import 'package:asciineverdie/l10n/app_localizations.dart';
 import 'package:asciineverdie/src/core/engine/iap_service.dart';
 import 'package:asciineverdie/src/shared/retro_colors.dart';
@@ -141,8 +142,8 @@ class StatsSection extends StatelessWidget {
             child: Center(
               child: Text(
                 canUndo
-                    ? 'Undo: $availableUndos  |  Rolls: $rollsRemaining/5'
-                    : 'Rolls: $rollsRemaining/5',
+                    ? game_l10n.uiUndoAndRolls(availableUndos, rollsRemaining)
+                    : game_l10n.uiRollsOnly(rollsRemaining),
                 style: const TextStyle(
                   fontFamily: 'PressStart2P',
                   fontSize: 11,