feat(phase7): 고정 4색 팔레트 시스템 적용

- ascii_colors.dart 생성
  - 흰색(object): 캐릭터, 몬스터, 아이템
  - 시안(positive): 힐, 버프, 레벨업, 획득
  - 마젠타(negative): 데미지, 디버프, 사망, 손실
  - 검정(background): 배경

- 테마 선택 기능 제거
  - AsciiAnimationCard: colorTheme 파라미터 제거, 고정 색상 사용
  - TaskProgressPanel: 테마 버튼 제거
  - GamePlayScreen: 테마 관련 상태/메서드 제거

- 이펙트 색상 시스템 업데이트
  - '*' (히트) → 마젠타
  - '!' '+' (강조/버프) → 시안
  - '~' (디버프) → 마젠타

lib/src/core/constants/ascii_colors.dart

@@ -0,0 +1,81 @@
+import 'package:flutter/material.dart';
+
+/// ASCII 애니메이션 4색 팔레트 (Phase 7)
+///
+/// 시각적 명확성을 위해 4가지 색상만 사용한다.
+/// - 흰색: 오브젝트 (캐릭터, 몬스터, 아이템)
+/// - 시안: 포지티브 이펙트 (힐, 버프, 레벨업, 획득)
+/// - 마젠타: 네거티브 이펙트 (데미지, 디버프, 사망, 손실)
+/// - 검정: 배경
+class AsciiColors {
+  AsciiColors._();
+
+  /// 오브젝트 색상 (캐릭터, 몬스터, 아이템)
+  static const Color object = Colors.white;
+
+  /// 포지티브 이펙트 색상 (힐, 버프, 레벨업, 획득)
+  static const Color positive = Colors.cyan;
+
+  /// 네거티브 이펙트 색상 (데미지, 디버프, 사망, 손실)
+  static const Color negative = Color(0xFFFF00FF); // 마젠타
+
+  /// 배경 색상
+  static const Color background = Colors.black;
+
+  /// 상황에 따른 색상 반환
+  static Color forContext(AsciiColorContext context) {
+    return switch (context) {
+      AsciiColorContext.idle => object,
+      AsciiColorContext.attack => object,
+      AsciiColorContext.critical => negative,
+      AsciiColorContext.heal => positive,
+      AsciiColorContext.buff => positive,
+      AsciiColorContext.debuff => negative,
+      AsciiColorContext.levelUp => positive,
+      AsciiColorContext.death => negative,
+      AsciiColorContext.itemGain => positive,
+      AsciiColorContext.itemLoss => negative,
+      AsciiColorContext.dodge => object,
+      AsciiColorContext.block => object,
+    };
+  }
+}
+
+/// ASCII 애니메이션 색상 컨텍스트
+enum AsciiColorContext {
+  /// 대기 상태
+  idle,
+
+  /// 일반 공격
+  attack,
+
+  /// 크리티컬 히트
+  critical,
+
+  /// 회복
+  heal,
+
+  /// 버프 획득
+  buff,
+
+  /// 디버프 적용
+  debuff,
+
+  /// 레벨업
+  levelUp,
+
+  /// 사망
+  death,
+
+  /// 아이템 획득
+  itemGain,
+
+  /// 아이템 손실
+  itemLoss,
+
+  /// 회피 성공
+  dodge,
+
+  /// 방패 방어
+  block,
+}

lib/src/features/game/game_play_screen.dart

@@ -1,16 +1,16 @@
 import 'package:flutter/material.dart';
 
 import 'package:askiineverdie/l10n/app_localizations.dart';
-import 'package:askiineverdie/src/core/animation/ascii_animation_data.dart';
 import 'package:askiineverdie/src/core/animation/ascii_animation_type.dart';
 import 'package:askiineverdie/src/core/l10n/game_data_l10n.dart';
 import 'package:askiineverdie/src/core/model/game_state.dart';
-import 'package:askiineverdie/src/core/storage/theme_preferences.dart';
 import 'package:askiineverdie/src/core/util/pq_logic.dart' as pq_logic;
 import 'package:askiineverdie/src/features/game/game_session_controller.dart';
 import 'package:askiineverdie/src/features/game/widgets/task_progress_panel.dart';
 
 /// 게임 진행 화면 (Main.dfm 기반 3패널 레이아웃)
+///
+/// Phase 7: colorTheme 제거됨, 고정 4색 팔레트 사용
 class GamePlayScreen extends StatefulWidget {
   const GamePlayScreen({super.key, required this.controller});
 
@@ -22,7 +22,6 @@ class GamePlayScreen extends StatefulWidget {
 
 class _GamePlayScreenState extends State<GamePlayScreen>
     with WidgetsBindingObserver {
-  AsciiColorTheme _colorTheme = AsciiColorTheme.green;
   AsciiAnimationType? _specialAnimation;
 
   // 이전 상태 추적 (레벨업/퀘스트/Act 완료 감지용)
@@ -30,28 +29,6 @@ class _GamePlayScreenState extends State<GamePlayScreen>
   int _lastQuestCount = 0;
   int _lastPlotStageCount = 0;
 
-  void _cycleColorTheme() {
-    setState(() {
-      _colorTheme = switch (_colorTheme) {
-        AsciiColorTheme.green => AsciiColorTheme.amber,
-        AsciiColorTheme.amber => AsciiColorTheme.white,
-        AsciiColorTheme.white => AsciiColorTheme.system,
-        AsciiColorTheme.system => AsciiColorTheme.green,
-      };
-    });
-    // 테마 변경 시 저장
-    ThemePreferences.saveColorTheme(_colorTheme);
-  }
-
-  Future<void> _loadColorTheme() async {
-    final theme = await ThemePreferences.loadColorTheme();
-    if (mounted) {
-      setState(() {
-        _colorTheme = theme;
-      });
-    }
-  }
-
   void _checkSpecialEvents(GameState state) {
     // 레벨업 감지
     if (state.traits.level > _lastLevel && _lastLevel > 0) {
@@ -92,7 +69,6 @@ class _GamePlayScreenState extends State<GamePlayScreen>
     super.initState();
     widget.controller.addListener(_onControllerChanged);
     WidgetsBinding.instance.addObserver(this);
-    _loadColorTheme();
 
     // 초기 상태 설정
     final state = widget.controller.state;
@@ -216,7 +192,7 @@ class _GamePlayScreenState extends State<GamePlayScreen>
         ),
         body: Column(
           children: [
-            // 상단: ASCII 애니메이션 + Task Progress
+            // 상단: ASCII 애니메이션 + Task Progress (Phase 7: 고정 4색 팔레트)
             TaskProgressPanel(
               progress: state.progress,
               speedMultiplier: widget.controller.loop?.speedMultiplier ?? 1,
@@ -224,8 +200,6 @@ class _GamePlayScreenState extends State<GamePlayScreen>
                 widget.controller.loop?.cycleSpeed();
                 setState(() {});
               },
-              colorTheme: _colorTheme,
-              onThemeCycle: _cycleColorTheme,
               isPaused: !widget.controller.isRunning,
               onPauseToggle: () async {
                 await widget.controller.togglePause();

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

@@ -9,6 +9,7 @@ import 'package:askiineverdie/src/core/animation/battle_composer.dart';
 import 'package:askiineverdie/src/core/animation/character_frames.dart';
 import 'package:askiineverdie/src/core/animation/monster_size.dart';
 import 'package:askiineverdie/src/core/animation/weapon_category.dart';
+import 'package:askiineverdie/src/core/constants/ascii_colors.dart';
 import 'package:askiineverdie/src/core/model/game_state.dart';
 
 /// ASCII 애니메이션 카드 위젯
@@ -336,31 +337,26 @@ class _AsciiAnimationCardState extends State<AsciiAnimationCard> {
     return TextSpan(children: spans);
   }
 
-  /// 이펙트 문자별 색상 반환
+  /// 이펙트 문자별 색상 반환 (Phase 7: 4색 팔레트)
   Color _getEffectColor(String char) {
     return switch (char) {
-      '*' => Colors.orange, // 히트/폭발
+      '*' => AsciiColors.negative, // 히트/폭발 (마젠타)
-      '!' => Colors.yellow, // 강조
+      '!' => AsciiColors.positive, // 강조 (시안)
-      '=' || '>' || '<' => Colors.cyan, // 슬래시/찌르기
+      '=' || '>' || '<' => AsciiColors.positive, // 슬래시/찌르기 (시안)
-      '~' => Colors.purple, // 물결/마법
+      '~' => AsciiColors.negative, // 물결/디버프 (마젠타)
-      _ => Colors.white,
+      '+' => AsciiColors.positive, // 회복/버프 (시안)
+      _ => AsciiColors.object, // 오브젝트 (흰색)
     };
   }
 
   @override
   Widget build(BuildContext context) {
-    final brightness = Theme.of(context).brightness;
+    // Phase 7: 고정 4색 팔레트 사용 (colorTheme 무시)
-    final colors = getThemeColors(widget.colorTheme, brightness);
+    const bgColor = AsciiColors.background;
-
+    const textColor = AsciiColors.object;
-    // 특수 애니메이션 중이면 특별한 배경색 적용
-    final isSpecial = _currentSpecialAnimation != null;
-    final bgColor = isSpecial
-        ? colors.backgroundColor.withValues(alpha: 0.95)
-        : colors.backgroundColor;
 
     // 프레임 텍스트 결정
     String frameText;
-    Color textColor = colors.textColor;
 
     if (_isBattleMode && _battleComposer != null) {
       // 새 배틀 시스템 사용 (배경 포함)
@@ -380,13 +376,16 @@ class _AsciiAnimationCardState extends State<AsciiAnimationCard> {
       frameText = _animationData.frames[frameIndex];
     }
 
+    // 특수 애니메이션 중이면 테두리 표시
+    final isSpecial = _currentSpecialAnimation != null;
+
     return Container(
       padding: const EdgeInsets.all(4),
       decoration: BoxDecoration(
         color: bgColor,
         borderRadius: BorderRadius.circular(4),
         border: isSpecial
-            ? Border.all(color: colors.textColor.withValues(alpha: 0.5))
+            ? Border.all(color: AsciiColors.positive.withValues(alpha: 0.5))
             : null,
       ),
       child: _isBattleMode

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

@@ -1,20 +1,19 @@
 import 'package:flutter/material.dart';
 
 import 'package:askiineverdie/l10n/app_localizations.dart';
-import 'package:askiineverdie/src/core/animation/ascii_animation_data.dart';
 import 'package:askiineverdie/src/core/animation/ascii_animation_type.dart';
 import 'package:askiineverdie/src/core/model/game_state.dart';
 import 'package:askiineverdie/src/features/game/widgets/ascii_animation_card.dart';
 
 /// 상단 패널: ASCII 애니메이션 + Task Progress 바
+///
+/// Phase 7: colorTheme 제거됨, 고정 4색 팔레트 사용
 class TaskProgressPanel extends StatelessWidget {
   const TaskProgressPanel({
     super.key,
     required this.progress,
     required this.speedMultiplier,
     required this.onSpeedCycle,
-    required this.colorTheme,
-    required this.onThemeCycle,
     required this.isPaused,
     required this.onPauseToggle,
     this.specialAnimation,
@@ -27,8 +26,6 @@ class TaskProgressPanel extends StatelessWidget {
   final ProgressState progress;
   final int speedMultiplier;
   final VoidCallback onSpeedCycle;
-  final AsciiColorTheme colorTheme;
-  final VoidCallback onThemeCycle;
 
   /// 일시 정지 상태
   final bool isPaused;
@@ -56,13 +53,12 @@ class TaskProgressPanel extends StatelessWidget {
       child: Column(
         mainAxisSize: MainAxisSize.min,
         children: [
-          // ASCII 애니메이션 카드
+          // ASCII 애니메이션 카드 (Phase 7: 고정 4색 팔레트)
           SizedBox(
             height: 120,
             child: AsciiAnimationCard(
               taskType: progress.currentTask.type,
               monsterBaseName: progress.currentTask.monsterBaseName,
-              colorTheme: colorTheme,
               specialAnimation: specialAnimation,
               weaponName: weaponName,
               shieldName: shieldName,
@@ -73,11 +69,9 @@ class TaskProgressPanel extends StatelessWidget {
           ),
           const SizedBox(height: 8),
 
-          // 상태 메시지 + 버튼들
+          // 상태 메시지 + 버튼들 (Phase 7: 테마 버튼 제거됨)
           Row(
             children: [
-              _buildThemeButton(context),
-              const SizedBox(width: 4),
               _buildPauseButton(context),
               const SizedBox(width: 8),
               Expanded(
@@ -102,41 +96,6 @@ class TaskProgressPanel extends StatelessWidget {
     );
   }
 
-  Widget _buildThemeButton(BuildContext context) {
-    final themeLabel = switch (colorTheme) {
-      AsciiColorTheme.green => 'G',
-      AsciiColorTheme.amber => 'A',
-      AsciiColorTheme.white => 'W',
-      AsciiColorTheme.system => 'S',
-    };
-
-    final themeColor = switch (colorTheme) {
-      AsciiColorTheme.green => const Color(0xFF00FF00),
-      AsciiColorTheme.amber => const Color(0xFFFFB000),
-      AsciiColorTheme.white => Colors.white,
-      AsciiColorTheme.system => Theme.of(context).colorScheme.primary,
-    };
-
-    return SizedBox(
-      height: 28,
-      child: OutlinedButton(
-        onPressed: onThemeCycle,
-        style: OutlinedButton.styleFrom(
-          padding: const EdgeInsets.symmetric(horizontal: 8),
-          visualDensity: VisualDensity.compact,
-          side: BorderSide(color: themeColor.withValues(alpha: 0.5)),
-        ),
-        child: Text(
-          themeLabel,
-          style: TextStyle(
-            fontWeight: FontWeight.bold,
-            color: themeColor,
-          ),
-        ),
-      ),
-    );
-  }
-
   Widget _buildPauseButton(BuildContext context) {
     return SizedBox(
       height: 28,