refactor(ui): 위젯 분리 및 화면 개선

- game_play_screen에서 desktop 패널 위젯 분리
- death_overlay에서 death_buttons, death_combat_log 분리
- mobile_carousel_layout에서 mobile_options_menu 분리
- 아레나 위젯 개선 (arena_hp_bar, result_panel 등)
- settings_screen에서 retro_settings_widgets 분리
- 기타 위젯 리팩토링 및 import 경로 업데이트

lib/src/features/game/pages/inventory_page.dart

@@ -2,7 +2,7 @@ import 'package:flutter/material.dart';
 
 import 'package:asciineverdie/data/game_text_l10n.dart' as l10n;
 import 'package:asciineverdie/l10n/app_localizations.dart';
-import 'package:asciineverdie/src/core/l10n/game_data_l10n.dart';
+import 'package:asciineverdie/src/shared/l10n/game_data_l10n.dart';
 import 'package:asciineverdie/src/core/model/game_state.dart';
 import 'package:asciineverdie/src/core/model/potion.dart';
 import 'package:asciineverdie/src/features/game/widgets/potion_inventory_panel.dart';