feat(arena): 아레나 전투 로그 위젯 추가

- ArenaCombatLog: 전투 로그 표시 위젯
- ArenaBattleScreen 연동

lib/src/features/arena/arena_battle_screen.dart

@@ -8,6 +8,7 @@ import 'package:asciineverdie/src/core/model/combat_event.dart';
 import 'package:asciineverdie/src/core/model/game_state.dart';
 import 'package:asciineverdie/src/core/model/hall_of_fame.dart';
 import 'package:asciineverdie/src/core/animation/race_character_frames.dart';
+import 'package:asciineverdie/src/features/arena/widgets/arena_combat_log.dart';
 import 'package:asciineverdie/src/features/arena/widgets/arena_result_panel.dart';
 import 'package:asciineverdie/src/features/arena/widgets/ascii_disintegrate_widget.dart';
 import 'package:asciineverdie/src/features/game/widgets/ascii_animation_card.dart';
@@ -376,8 +377,13 @@ class _ArenaBattleScreenState extends State<ArenaBattleScreen>
   }
 
   void _endBattle() {
-    // 최종 결과 계산
-    _result = _arenaService.executeCombat(widget.match);
+    // 시뮬레이션 HP 결과를 기반으로 최종 결과 계산
+    _result = _arenaService.createResultFromSimulation(
+      match: widget.match,
+      challengerHp: _challengerHp,
+      opponentHp: _opponentHp,
+      turns: _currentTurn,
+    );
 
     // 전투 종료 상태로 전환 (인라인 결과 패널 표시)
     setState(() {
@@ -836,7 +842,7 @@ class _ArenaBattleScreenState extends State<ArenaBattleScreen>
         borderRadius: BorderRadius.circular(8),
         border: Border.all(color: RetroColors.borderOf(context)),
       ),
-      child: CombatLog(entries: _battleLog),
+      child: ArenaCombatLog(entries: _battleLog),
     );
   }
 

lib/src/features/arena/widgets/arena_combat_log.dart

@@ -0,0 +1,199 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+
+import 'package:asciineverdie/src/features/game/widgets/combat_log.dart';
+
+/// 아레나 전용 전투 로그 위젯
+///
+/// 일반 CombatLog와 다른 점:
+/// - 최신 메시지가 상단에 표시 (reverse order)
+/// - 사용자 조작 시 자동 스크롤 중지
+/// - 5초 미조작 시 자동 스크롤 재개
+class ArenaCombatLog extends StatefulWidget {
+  const ArenaCombatLog({
+    super.key,
+    required this.entries,
+    this.maxEntries = 50,
+  });
+
+  final List<CombatLogEntry> entries;
+  final int maxEntries;
+
+  @override
+  State<ArenaCombatLog> createState() => _ArenaCombatLogState();
+}
+
+class _ArenaCombatLogState extends State<ArenaCombatLog> {
+  final ScrollController _scrollController = ScrollController();
+
+  /// 자동 스크롤 활성화 여부
+  bool _autoScrollEnabled = true;
+
+  /// 사용자 조작 후 자동 스크롤 재개 타이머
+  Timer? _resumeAutoScrollTimer;
+
+  /// 자동 스크롤 재개까지 대기 시간 (5초)
+  static const _autoScrollResumeDelay = Duration(seconds: 5);
+
+  int _previousLength = 0;
+
+  @override
+  void didUpdateWidget(ArenaCombatLog oldWidget) {
+    super.didUpdateWidget(oldWidget);
+
+    // 새 로그 추가 시 자동 스크롤 (활성화된 경우에만)
+    if (widget.entries.length > _previousLength && _autoScrollEnabled) {
+      _scrollToTop();
+    }
+    _previousLength = widget.entries.length;
+  }
+
+  /// 최상단으로 스크롤 (최신 메시지가 상단이므로 position 0)
+  void _scrollToTop() {
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      if (_scrollController.hasClients) {
+        _scrollController.animateTo(
+          0,
+          duration: const Duration(milliseconds: 200),
+          curve: Curves.easeOut,
+        );
+      }
+    });
+  }
+
+  /// 사용자 스크롤 감지 시 호출
+  void _onUserScroll() {
+    // 자동 스크롤 비활성화
+    setState(() {
+      _autoScrollEnabled = false;
+    });
+
+    // 기존 타이머 취소
+    _resumeAutoScrollTimer?.cancel();
+
+    // 5초 후 자동 스크롤 재활성화
+    _resumeAutoScrollTimer = Timer(_autoScrollResumeDelay, () {
+      if (mounted) {
+        setState(() {
+          _autoScrollEnabled = true;
+        });
+        // 재활성화 시 최상단으로 스크롤
+        _scrollToTop();
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _resumeAutoScrollTimer?.cancel();
+    _scrollController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    // 최신 메시지가 상단에 오도록 역순 리스트 생성
+    final reversedEntries = widget.entries.reversed.toList();
+
+    return NotificationListener<ScrollNotification>(
+      onNotification: (notification) {
+        // 사용자가 직접 스크롤할 때만 감지 (UserScrollNotification)
+        if (notification is UserScrollNotification) {
+          _onUserScroll();
+        }
+        return false;
+      },
+      child: ListView.builder(
+        controller: _scrollController,
+        itemCount: reversedEntries.length,
+        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
+        itemBuilder: (context, index) {
+          final entry = reversedEntries[index];
+          return _ArenaLogEntryTile(entry: entry);
+        },
+      ),
+    );
+  }
+}
+
+/// 개별 로그 엔트리 타일 (아레나용)
+class _ArenaLogEntryTile extends StatelessWidget {
+  const _ArenaLogEntryTile({required this.entry});
+
+  final CombatLogEntry entry;
+
+  @override
+  Widget build(BuildContext context) {
+    final (color, icon) = _getStyleForType(entry.type);
+
+    return Padding(
+      padding: const EdgeInsets.symmetric(vertical: 1),
+      child: Row(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          // 타임스탬프(timestamp)
+          Text(
+            _formatTime(entry.timestamp),
+            style: TextStyle(
+              fontSize: 10,
+              color: Theme.of(context).colorScheme.outline,
+              fontFamily: 'JetBrainsMono',
+            ),
+          ),
+          const SizedBox(width: 4),
+          // 아이콘
+          if (icon != null)
+            Padding(
+              padding: const EdgeInsets.only(right: 4),
+              child: Icon(icon, size: 12, color: color),
+            ),
+          // 메시지
+          Expanded(
+            child: Text(
+              entry.message,
+              style: TextStyle(
+                fontSize: 11,
+                color: color ?? Theme.of(context).colorScheme.onSurface,
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  String _formatTime(DateTime time) {
+    return '${time.hour.toString().padLeft(2, '0')}:'
+        '${time.minute.toString().padLeft(2, '0')}:'
+        '${time.second.toString().padLeft(2, '0')}';
+  }
+
+  (Color?, IconData?) _getStyleForType(CombatLogType type) {
+    return switch (type) {
+      CombatLogType.normal => (null, null),
+      CombatLogType.damage => (
+        Colors.red.shade300,
+        Icons.local_fire_department,
+      ),
+      CombatLogType.heal => (Colors.green.shade300, Icons.healing),
+      CombatLogType.levelUp => (Colors.amber, Icons.arrow_upward),
+      CombatLogType.questComplete => (Colors.blue.shade300, Icons.check_circle),
+      CombatLogType.loot => (Colors.orange.shade300, Icons.inventory_2),
+      CombatLogType.skill => (Colors.purple.shade300, Icons.auto_fix_high),
+      CombatLogType.critical => (Colors.yellow.shade300, Icons.flash_on),
+      CombatLogType.evade => (Colors.cyan.shade300, Icons.directions_run),
+      CombatLogType.block => (Colors.blueGrey.shade300, Icons.shield),
+      CombatLogType.parry => (Colors.teal.shade300, Icons.sports_kabaddi),
+      CombatLogType.monsterAttack => (
+        Colors.deepOrange.shade300,
+        Icons.dangerous,
+      ),
+      CombatLogType.buff => (Colors.lightBlue.shade300, Icons.trending_up),
+      CombatLogType.debuff => (Colors.deepOrange.shade300, Icons.trending_down),
+      CombatLogType.dotTick => (Colors.deepPurple.shade300, Icons.whatshot),
+      CombatLogType.potion => (Colors.pink.shade300, Icons.local_drink),
+      CombatLogType.potionDrop => (Colors.lime.shade300, Icons.card_giftcard),
+    };
+  }
+}