Move language setting to primary interface section

Language is a first-class presentation preference alongside Theme and
Zoom, so it shouldn't be buried in the Advanced disclosure. Advanced
now contains only platform-chrome controls.

src/renderer/src/components/settings/AppearanceInterfaceSection.tsx

@@ -66,13 +66,14 @@ export function AppearanceInterfaceSection({
   const titlebarEntry = getTitlebarEntries()[0]
   const typographyEntry = getTypographyEntries()[0]
   const zoomEntry = getZoomEntries()[0]
+  // Language is primary (with Theme/Zoom/Font); Advanced is platform chrome only.
   const advancedEntries = [
-    ...(SHOW_UI_LANGUAGE_SETTING ? getLanguageEntries() : []),
     ...getTitlebarEntries(),
     ...getSystemTrayEntries({ showSystemTray: isDesktopWindows }),
     ...getMenuBarIconEntries({ showMenuBarIcon: isDesktopMac })
   ]
   const showAdvanced = !isSearching || matchesSettingsSearch(searchQuery, advancedEntries)
+  const languageTitle = translate('settings.appearance.language.title', 'Language')
 
   return (
     <div className="divide-y divide-border/40">
@@ -111,6 +112,36 @@ export function AppearanceInterfaceSection({
         />
       </SearchableSetting>
 
+      {SHOW_UI_LANGUAGE_SETTING ? (
+        <SearchableSetting
+          title={languageTitle}
+          description={languageEntry?.description}
+          keywords={languageEntry?.keywords ?? []}
+          forceVisible={forceVisiblePrimary}
+        >
+          <SettingsRow
+            label={languageTitle}
+            control={
+              <Select
+                value={settings.uiLanguage}
+                onValueChange={(value) => updateSettings({ uiLanguage: value as UiLanguage })}
+              >
+                <SelectTrigger size="sm" className="min-w-[220px]" aria-label={languageTitle}>
+                  <SelectValue />
+                </SelectTrigger>
+                <SelectContent>
+                  {UI_LANGUAGE_CHOICES.map((choice) => (
+                    <SelectItem key={choice.value} value={choice.value}>
+                      {getUiLanguageChoiceLabel(choice, translate)}
+                    </SelectItem>
+                  ))}
+                </SelectContent>
+              </Select>
+            }
+          />
+        </SearchableSetting>
+      ) : null}
+
       <SearchableSetting
         title={translate('auto.components.settings.AppearancePane.5e6d7aba8d', 'UI Zoom')}
         description={zoomEntry?.description}
@@ -161,39 +192,6 @@ export function AppearanceInterfaceSection({
       {showAdvanced ? (
         <AppearanceAdvancedDisclosure showTopBorder={false}>
           <div className="divide-y divide-border/40">
-            {SHOW_UI_LANGUAGE_SETTING ? (
-              <SearchableSetting
-                title={translate('settings.appearance.language.title', 'Language')}
-                description={languageEntry?.description}
-                keywords={languageEntry?.keywords ?? []}
-              >
-                <SettingsRow
-                  label={translate('settings.appearance.language.title', 'Language')}
-                  control={
-                    <Select
-                      value={settings.uiLanguage}
-                      onValueChange={(value) => updateSettings({ uiLanguage: value as UiLanguage })}
-                    >
-                      <SelectTrigger
-                        size="sm"
-                        className="min-w-[220px]"
-                        aria-label={translate('settings.appearance.language.title', 'Language')}
-                      >
-                        <SelectValue />
-                      </SelectTrigger>
-                      <SelectContent>
-                        {UI_LANGUAGE_CHOICES.map((choice) => (
-                          <SelectItem key={choice.value} value={choice.value}>
-                            {getUiLanguageChoiceLabel(choice, translate)}
-                          </SelectItem>
-                        ))}
-                      </SelectContent>
-                    </Select>
-                  }
-                />
-              </SearchableSetting>
-            ) : null}
-
             <SearchableSetting
               title={translate(
                 'auto.components.settings.AppearancePane.9868f39007',

src/renderer/src/components/settings/AppearancePane.test.tsx

@@ -202,6 +202,22 @@ describe('AppearancePane', () => {
     delete (window as unknown as { api?: unknown }).api
   })
 
+  it('shows language as a primary interface control without opening Advanced', async () => {
+    // Language is a first-class presentation pref next to Theme — browsing
+    // Appearance → Interface must surface it without expanding Advanced.
+    mocks.state.settingsSearchQuery = ''
+    const container = await renderAppearancePane(getDefaultSettings('/tmp'))
+    const languageTrigger = container.querySelector<HTMLButtonElement>(
+      '[data-slot="select-trigger"][aria-label="Language"]'
+    )
+
+    expect(languageTrigger).not.toBeNull()
+    // Advanced platform-chrome controls stay collapsed by default.
+    expect(
+      container.querySelector('button[role="switch"][aria-label="Titlebar App Name"]')
+    ).toBeNull()
+  })
+
   it('renders the language dropdown with system, english, chinese, korean, japanese, and spanish options', async () => {
     mocks.state.settingsSearchQuery = 'language'
     const updateSettings = vi.fn()