feat(console): toolbar toggle to hide per-line color accent bars

Adds a paint-bucket toggle button to the console toolbar (in the appearance
cluster next to zoom) that shows/hides the per-line left color accent bars for
a cleaner monochrome gutter. The icon reflects state (FORMAT_COLOR_FILL when on,
a dimmed FORMAT_COLOR_RESET when off) with a tooltip. Session-only, like the
console zoom factor; default on.

Adds console_toggle_accents to the English source and all eight translations
(no new CJK glyphs — the subset font already covers them).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

res/lang/de.json

@@ -240,6 +240,7 @@
     "console_status_stopping": "Stoppt",
     "console_status_unknown": "Unbekannt",
     "console_tab_completion": "Tab zur Vervollständigung",
+    "console_toggle_accents": "Farbakzente der Zeilen umschalten",
     "console_type_help": "Geben Sie 'help' ein für verfügbare Befehle",
     "console_welcome": "Willkommen bei ObsidianDragon Konsole",
     "console_zoom_in": "Vergrößern",

res/lang/es.json

@@ -240,6 +240,7 @@
     "console_status_stopping": "Deteniendo",
     "console_status_unknown": "Desconocido",
     "console_tab_completion": "Tab para completar",
+    "console_toggle_accents": "Alternar acentos de color de línea",
     "console_type_help": "Escribe 'help' para ver los comandos disponibles",
     "console_welcome": "Bienvenido a la Consola de ObsidianDragon",
     "console_zoom_in": "Acercar",

res/lang/fr.json

@@ -240,6 +240,7 @@
     "console_status_stopping": "Arrêt",
     "console_status_unknown": "Inconnu",
     "console_tab_completion": "Tab pour compléter",
+    "console_toggle_accents": "Basculer les accents de couleur des lignes",
     "console_type_help": "Tapez 'help' pour les commandes disponibles",
     "console_welcome": "Bienvenue dans la console ObsidianDragon",
     "console_zoom_in": "Agrandir",

res/lang/ja.json

@@ -240,6 +240,7 @@
     "console_status_stopping": "停止中",
     "console_status_unknown": "不明",
     "console_tab_completion": "Tabで補完",
+    "console_toggle_accents": "行のカラーアクセントを切り替え",
     "console_type_help": "'help'と入力して利用可能なコマンドを表示",
     "console_welcome": "ObsidianDragonコンソールへようこそ",
     "console_zoom_in": "拡大",

res/lang/ko.json

@@ -240,6 +240,7 @@
     "console_status_stopping": "중지 중",
     "console_status_unknown": "알 수 없음",
     "console_tab_completion": "Tab으로 자동 완성",
+    "console_toggle_accents": "줄 색상 강조 전환",
     "console_type_help": "'help'를 입력하여 사용 가능한 명령어 보기",
     "console_welcome": "ObsidianDragon 콘솔에 오신 것을 환영합니다",
     "console_zoom_in": "확대",

res/lang/pt.json

@@ -240,6 +240,7 @@
     "console_status_stopping": "Parando",
     "console_status_unknown": "Desconhecido",
     "console_tab_completion": "Tab para completar",
+    "console_toggle_accents": "Alternar destaques de cor das linhas",
     "console_type_help": "Digite 'help' para comandos disponíveis",
     "console_welcome": "Bem-vindo ao Console ObsidianDragon",
     "console_zoom_in": "Aumentar zoom",

res/lang/ru.json

@@ -240,6 +240,7 @@
     "console_status_stopping": "Остановка",
     "console_status_unknown": "Неизвестно",
     "console_tab_completion": "Tab для дополнения",
+    "console_toggle_accents": "Переключить цветовые акценты строк",
     "console_type_help": "Введите 'help' для списка команд",
     "console_welcome": "Добро пожаловать в консоль ObsidianDragon",
     "console_zoom_in": "Увеличить",

res/lang/zh.json

@@ -240,6 +240,7 @@
     "console_status_stopping": "停止中",
     "console_status_unknown": "未知",
     "console_tab_completion": "Tab 补全",
+    "console_toggle_accents": "切换行颜色强调",
     "console_type_help": "输入 'help' 查看可用命令",
     "console_welcome": "欢迎使用 ObsidianDragon 控制台",
     "console_zoom_in": "放大",