✨ Added dark theme and white theme switching

frontend/src/i18n/locales/en-US.ts

@@ -37,12 +37,19 @@ export default {
     languageChanged: 'Language setting updated',
     languageChangeFailed: 'Failed to update language setting',
     themeChanged: 'Theme setting updated',
-    themeChangeFailed: 'Failed to update theme setting'
+    themeChangeFailed: 'Failed to update theme setting',
+    systemThemeChanged: 'System theme setting updated',
+    systemThemeChangeFailed: 'Failed to update system theme setting'
   },
   languages: {
     'zh-CN': '简体中文',
     'en-US': 'English'
   },
+  systemTheme: {
+    dark: 'Dark',
+    light: 'Light',
+    auto: 'Follow System'
+  },
   document: {
     loadSuccess: 'Document loaded successfully',
     loadFailed: 'Failed to load document',
@@ -76,7 +83,6 @@ export default {
     cancel: 'Cancel',
     dangerZone: 'Danger Zone',
     resetAllSettings: 'Reset All Settings',
-    resetDescription: 'This will restore all settings to their default values. This action cannot be undone.',
     confirmReset: 'Click again to confirm reset',
     globalHotkey: 'Global Keyboard Shortcuts',
     enableGlobalHotkey: 'Enable Global Hotkeys',
@@ -106,6 +112,7 @@ export default {
     tabs: 'Tabs',
     enableTabIndent: 'Enable Tab Indent',
     language: 'Interface Language',
+    systemTheme: 'System Theme',
     theme: 'Editor Theme',
     themeDescription: 'Choose editor theme',
     restartRequired: '(Restart required)',

frontend/src/i18n/locales/zh-CN.ts

@@ -37,12 +37,19 @@ export default {
     languageChanged: '语言设置已更新',
     languageChangeFailed: '语言设置更新失败',
     themeChanged: '主题设置已更新',
-    themeChangeFailed: '主题设置更新失败'
+    themeChangeFailed: '主题设置更新失败',
+    systemThemeChanged: '系统主题设置已更新',
+    systemThemeChangeFailed: '系统主题设置更新失败'
   },
   languages: {
     'zh-CN': '简体中文',
     'en-US': 'English'
   },
+  systemTheme: {
+    dark: '深色',
+    light: '浅色',
+    auto: '跟随系统'
+  },
   document: {
     loadSuccess: '文档加载成功',
     loadFailed: '文档加载失败',
@@ -76,7 +83,6 @@ export default {
     cancel: '取消',
     dangerZone: '危险操作',
     resetAllSettings: '重置所有设置',
-    resetDescription: '这将恢复所有设置为默认值，此操作无法撤销',
     confirmReset: '再次点击确认重置',
     globalHotkey: '全局键盘快捷键',
     enableGlobalHotkey: '启用全局热键',
@@ -106,6 +112,7 @@ export default {
     tabs: '制表符',
     enableTabIndent: '启用 Tab 缩进',
     language: '界面语言',
+    systemTheme: '系统主题',
     theme: '编辑器主题',
     themeDescription: '选择编辑器主题',
     restartRequired: '(需要重启)',