feat: 添加终端样式预览按钮

packages/frontend/src/locales/en-US.json

@@ -84,6 +84,7 @@
     "terminalThemeColorEditorTitle": "Terminal Theme Color Editor",
     "errorFixJsonBeforeSave": "Please fix the JSON format errors before saving.",
     "applyButton": "Apply",
+    "previewButton":"Preview",
     "searchThemePlaceholder": "Search theme name...",
     "exportActiveThemeTooltip": "Export the currently active theme as a JSON file",
     "exportActiveTheme": "Export Active Theme",

packages/frontend/src/locales/ja-JP.json

@@ -1195,6 +1195,7 @@
         "activeTheme": "現在のテーマ",
         "addNewTheme": "新しいテーマを作成",
         "applyButton": "適用",
+        "previewButton":"プレビュー",
         "applyThemeTooltip": "このテーマを適用",
         "backgroundSettings": "背景設定",
         "cannotDeletePreset": "プリセットテーマは削除できません",

packages/frontend/src/locales/zh-CN.json

@@ -83,6 +83,7 @@
     "terminalThemeColorEditorTitle": "终端主题颜色编辑器",
     "errorFixJsonBeforeSave": "请先修复 JSON 格式错误再保存。",
     "applyButton": "应用",
+    "previewButton":"预览",
     "searchThemePlaceholder": "搜索主题名称...",
     "exportActiveThemeTooltip": "将当前激活的主题导出为 JSON 文件",
     "exportActiveTheme": "导出当前主题",