feat(animation): 아레나 전투 애니메이션 지원

- CanvasBattleComposer: 아레나 모드 지원 추가
- AsciiAnimationCard: 아레나 전투 애니메이션 렌더링

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

@@ -50,6 +50,8 @@ class AsciiAnimationCard extends StatefulWidget {
     this.latestCombatEvent,
     this.raceId,
     this.weaponRarity,
+    this.opponentRaceId,
+    this.opponentHasShield = false,
   });
 
   final TaskType taskType;
@@ -89,6 +91,12 @@ class AsciiAnimationCard extends StatefulWidget {
   /// 무기 희귀도 (Phase 9: 무기 등급별 이펙트 색상)
   final ItemRarity? weaponRarity;
 
+  /// 상대 종족 ID (PvP 모드: 설정 시 몬스터 대신 캐릭터 표시)
+  final String? opponentRaceId;
+
+  /// 상대 방패 장착 여부 (PvP 모드)
+  final bool opponentHasShield;
+
   @override
   State<AsciiAnimationCard> createState() => _AsciiAnimationCardState();
 }
@@ -208,7 +216,9 @@ class _AsciiAnimationCardState extends State<AsciiAnimationCard> {
         oldWidget.shieldName != widget.shieldName ||
         oldWidget.monsterLevel != widget.monsterLevel ||
         oldWidget.raceId != widget.raceId ||
-        oldWidget.weaponRarity != widget.weaponRarity) {
+        oldWidget.weaponRarity != widget.weaponRarity ||
+        oldWidget.opponentRaceId != widget.opponentRaceId ||
+        oldWidget.opponentHasShield != widget.opponentHasShield) {
       _updateAnimation();
     }
   }
@@ -445,6 +455,8 @@ class _AsciiAnimationCardState extends State<AsciiAnimationCard> {
       monsterSize: monsterSize,
       raceId: widget.raceId,
       weaponRarity: widget.weaponRarity,
+      opponentRaceId: widget.opponentRaceId,
+      opponentHasShield: widget.opponentHasShield,
     );
 
     // 환경 타입 추론