fix(settings): 定时切换主题去掉时区下拉与说明文字,固定用浏览器本地时区

frontend/src/i18n/locales/en/settings.ts

@@ -137,10 +137,6 @@ export default {
     dark: 'Dark',
     system: 'Follow System',
     auto: 'Scheduled',
-    timezone: 'Timezone',
-    timezoneAria: 'Theme schedule timezone',
-    browser: 'Follow browser (local)',
-    autoHint: 'Light from {{start}}:00–{{end}}:00 in the chosen timezone, dark otherwise; the top bar toggle always works.',
   },
   prefsCard: {
     title: 'Appearance & Language',

frontend/src/i18n/locales/zh/settings.ts

@@ -137,10 +137,6 @@ export default {
     dark: '深色',
     system: '跟随系统',
     auto: '定时切换',
-    timezone: '判定时区',
-    timezoneAria: '主题定时切换时区',
-    browser: '跟随浏览器(本地)',
-    autoHint: '按所选时区 {{start}}:00–{{end}}:00 浅色，其余深色；顶栏可随时手动切换。',
   },
   prefsCard: {
     title: '外观与语言',

frontend/src/pages/settings/components/ThemeSection.tsx

@@ -1,4 +1,4 @@
-import { memo, useMemo } from 'react'
+import { memo } from 'react'
 import { useTranslation } from 'react-i18next'
 import { useTheme } from 'next-themes'
 import { Sun, Moon, Monitor, Clock } from 'lucide-react'
@@ -7,17 +7,8 @@ import {
   DAY_START_HOUR,
   DAY_END_HOUR,
   setThemeAuto,
-  setThemeTimezone,
-  listTimezones,
 } from '@/lib/theme-schedule'
 import { useScheduledTheme } from '@/hooks/useScheduledTheme'
-import {
-  Select,
-  SelectContent,
-  SelectItem,
-  SelectTrigger,
-  SelectValue,
-} from '@/components/ui/select'
 
 type ThemeMode = 'light' | 'dark' | 'system' | 'auto'
 
@@ -36,8 +27,7 @@ const OPTIONS: Array<{ value: ThemeMode; labelKey: string; icon: typeof Sun }> =
 export const ThemeSection = memo(function ThemeSection() {
   const { theme, setTheme } = useTheme()
   const { t } = useTranslation('settings')
-  const { auto, timezone } = useScheduledTheme()
-  const timezones = useMemo(() => listTimezones(), [])
+  const { auto } = useScheduledTheme()
   const activeValue: ThemeMode = auto ? 'auto' : theme === 'system' ? 'system' : theme === 'dark' ? 'dark' : 'light'
 
   const selectTheme = (value: ThemeMode) => {
@@ -76,19 +66,6 @@ export const ThemeSection = memo(function ThemeSection() {
             )
           })}
         </div>
-        {auto && (
-          <Select value={timezone || 'browser'} onValueChange={(v) => setThemeTimezone(v === 'browser' ? '' : v)}>
-            <SelectTrigger className="h-8 w-44" aria-label={t('themeCard.timezoneAria')}>
-              <SelectValue />
-            </SelectTrigger>
-            <SelectContent>
-              <SelectItem value="browser">{t('themeCard.browser')}</SelectItem>
-              {timezones.map((tz) => (
-                <SelectItem key={tz} value={tz}>{tz}</SelectItem>
-              ))}
-            </SelectContent>
-          </Select>
-        )}
       </div>
       {auto && (
         <p className="text-xs text-muted-foreground">