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/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();