feat: add Turkish localization support

lib/core/providers/settings_provider.dart

@@ -1403,7 +1403,7 @@ class SettingsProvider extends ChangeNotifier {
   }
 
   // ===== App locale (UI language) =====
-  String? _appLocaleTag; // 'system', 'zh_CN', 'zh_Hant', 'en_US'
+  String? _appLocaleTag; // 'system', 'zh_CN', 'zh_Hant', 'en_US', 'tr_TR'
   Locale get appLocale => _parseLocaleTag(_appLocaleTag ?? 'en_US');
   bool get isFollowingSystemLocale =>
       (_appLocaleTag == null) || (_appLocaleTag == 'system');
@@ -1433,6 +1433,9 @@ class SettingsProvider extends ChangeNotifier {
       if (script == 'hant') return 'zh_Hant';
       return 'zh_CN';
     }
+    if (lc == 'tr') {
+      return 'tr_TR';
+    }
     return 'en_US';
   }
 
@@ -1443,6 +1446,9 @@ class SettingsProvider extends ChangeNotifier {
       case 'zh_Hant':
         return const Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant');
       case 'en_US':
+        return const Locale('en', 'US');
+      case 'tr_TR':
+        return const Locale('tr', 'TR');
       default:
         return const Locale('en', 'US');
     }

lib/desktop/desktop_translate_page.dart

@@ -112,6 +112,8 @@ class _DesktopTranslatePageState extends State<DesktopTranslatePage> {
         return l10n.languageDisplayItalian;
       case 'es':
         return l10n.languageDisplaySpanish;
+      case 'tr':
+        return l10n.languageDisplayTurkish;
       default:
         return code;
     }
@@ -591,6 +593,8 @@ class _LanguageDropdownState extends State<_LanguageDropdown> {
         return l10n.languageDisplayItalian;
       case 'es':
         return l10n.languageDisplaySpanish;
+      case 'tr':
+        return l10n.languageDisplayTurkish;
       default:
         return code;
     }
@@ -824,6 +828,8 @@ class _LangOptionTileState extends State<_LangOptionTile> {
         return l10n.languageDisplayItalian;
       case 'es':
         return l10n.languageDisplaySpanish;
+      case 'tr':
+        return l10n.languageDisplayTurkish;
       default:
         return code;
     }

lib/desktop/setting/display_pane.dart

@@ -771,6 +771,7 @@ class _AppLanguageRowState extends State<_AppLanguageRow> {
             '🇨🇳 ${AppLocalizations.of(ctx)!.displaySettingsPageLanguageChineseLabel}',
             '🇨🇳 ${AppLocalizations.of(ctx)!.languageDisplayTraditionalChinese}',
             '🇺🇸 ${AppLocalizations.of(ctx)!.displaySettingsPageLanguageEnglishLabel}',
+            '🇹🇷 ${AppLocalizations.of(ctx)!.languageDisplayTurkish}',
           ];
           double maxText = 0;
           for (final s in labels) {
@@ -835,6 +836,9 @@ class _AppLanguageRowState extends State<_AppLanguageRow> {
           return l10n.languageDisplayTraditionalChinese;
         return l10n.displaySettingsPageLanguageChineseLabel;
       }
+      if (l.languageCode == 'tr') {
+        return l10n.languageDisplayTurkish;
+      }
       return l10n.displaySettingsPageLanguageEnglishLabel;
     }
 
@@ -1173,6 +1177,14 @@ class _LanguageDropdownState extends State<_LanguageDropdown> {
         ),
         (!sp.isFollowingSystemLocale && sp.appLocale.languageCode == 'en'),
       ),
+      (
+        _LangItem(
+          flag: '🇹🇷',
+          label: l10n.languageDisplayTurkish,
+          tag: 'tr_TR',
+        ),
+        (!sp.isFollowingSystemLocale && sp.appLocale.languageCode == 'tr'),
+      ),
     ];
     final maxH = MediaQuery.of(context).size.height * 0.5;
     return AnimatedOpacity(
@@ -1237,6 +1249,15 @@ class _LanguageDropdownState extends State<_LanguageDropdown> {
                                   );
                               break;
                             case 'en_US':
+                              await context
+                                  .read<SettingsProvider>()
+                                  .setAppLocale(const Locale('en', 'US'));
+                              break;
+                            case 'tr_TR':
+                              await context
+                                  .read<SettingsProvider>()
+                                  .setAppLocale(const Locale('tr', 'TR'));
+                              break;
                             default:
                               await context
                                   .read<SettingsProvider>()
@@ -1260,7 +1281,7 @@ class _LanguageDropdownState extends State<_LanguageDropdown> {
 class _LangItem {
   final String flag;
   final String label;
-  final String tag; // 'system' | 'zh_CN' | 'zh_Hant' | 'en_US'
+  final String tag; // 'system' | 'zh_CN' | 'zh_Hant' | 'en_US' | 'tr_TR'
   const _LangItem({required this.flag, required this.label, required this.tag});
 }
 

lib/features/settings/pages/display_settings_page.dart

@@ -93,6 +93,9 @@ class _DisplaySettingsPageState extends State<DisplaySettingsPage> {
                         return l10n.languageDisplayTraditionalChinese;
                       return l10n.displaySettingsPageLanguageChineseLabel;
                     }
+                    if (l.languageCode == 'tr') {
+                      return l10n.languageDisplayTurkish;
+                    }
                     return l10n.displaySettingsPageLanguageEnglishLabel;
                   }
 
@@ -621,6 +624,12 @@ class _DisplaySettingsPageState extends State<DisplaySettingsPage> {
                   label: l10n.displaySettingsPageLanguageEnglishLabel,
                   onTap: () => Navigator.of(ctx).pop('en_US'),
                 ),
+                _sheetDividerNoIcon(ctx),
+                _sheetOption(
+                  ctx,
+                  label: l10n.languageDisplayTurkish,
+                  onTap: () => Navigator.of(ctx).pop('tr_TR'),
+                ),
               ],
             ),
           ),
@@ -643,6 +652,15 @@ class _DisplaySettingsPageState extends State<DisplaySettingsPage> {
         );
         break;
       case 'en_US':
+        await context.read<SettingsProvider>().setAppLocale(
+          const Locale('en', 'US'),
+        );
+        break;
+      case 'tr_TR':
+        await context.read<SettingsProvider>().setAppLocale(
+          const Locale('tr', 'TR'),
+        );
+        break;
       default:
         await context.read<SettingsProvider>().setAppLocale(
           const Locale('en', 'US'),

lib/features/settings/widgets/language_select_sheet.dart

@@ -77,6 +77,12 @@ const List<LanguageOption> supportedLanguages = [
     displayNameZh: 'Español',
     flag: '🇪🇸',
   ),
+  LanguageOption(
+    code: 'tr',
+    displayName: 'Turkish',
+    displayNameZh: 'Turkce',
+    flag: '🇹🇷',
+  ),
   // LanguageOption(code: 'pt', displayName: 'Portuguese', displayNameZh: 'Português', flag: '🇵🇹'),
   // LanguageOption(code: 'ru', displayName: 'Russian', displayNameZh: 'Русский', flag: '🇷🇺'),
   // LanguageOption(code: 'ar', displayName: 'Arabic', displayNameZh: 'العربية', flag: '🇸🇦'),
@@ -105,6 +111,8 @@ String _displayNameFor(AppLocalizations l10n, String languageCode) {
       return l10n.languageDisplayItalian;
     case 'es':
       return l10n.languageDisplaySpanish;
+    case 'tr':
+      return l10n.languageDisplayTurkish;
     default:
       return languageCode;
   }
@@ -322,6 +330,8 @@ class _LanguageSelectSheetState extends State<_LanguageSelectSheet> {
         return l10n.languageDisplayItalian;
       case 'es':
         return l10n.languageDisplaySpanish;
+      case 'tr':
+        return l10n.languageDisplayTurkish;
       default:
         return languageCode;
     }

lib/features/translate/pages/translate_page.dart

@@ -205,6 +205,8 @@ class _TranslatePageState extends State<TranslatePage> {
         return l10n.languageDisplayItalian;
       case 'es':
         return l10n.languageDisplaySpanish;
+      case 'tr':
+        return l10n.languageDisplayTurkish;
       default:
         return code;
     }

lib/l10n/app_en.arb

@@ -173,6 +173,7 @@
   "languageDisplayGerman": "German",
   "languageDisplayItalian": "Italian",
   "languageDisplaySpanish": "Spanish",
+  "languageDisplayTurkish": "Turkish",
   "languageSelectSheetTitle": "Select Translation Language",
   "languageSelectSheetClearButton": "Clear Translation",
   "homePageClearContext": "Clear Context",
@@ -1391,7 +1392,7 @@
   "desktopFontLoading": "Loading fonts…",
   "displaySettingsPageFontLocalFileLabel": "Local file",
   "displaySettingsPageFontResetLabel": "Reset font settings",
-  "displaySettingsPageOtherSettingsTitle": "Other",
+  "displaySettingsPageOtherSettingsTitle": "Other Settings",
   "themeSettingsPageDynamicColorSection": "Dynamic Color",
   "themeSettingsPageUseDynamicColorTitle": "System Dynamic Colors",
   "themeSettingsPageUseDynamicColorSubtitle": "Match system palette (Android 12+)",
@@ -1579,14 +1580,15 @@
   "displaySettingsPageBehaviorStartupTitle": "Behavior & startup",
   "displaySettingsPageHapticsSettingsTitle": "Haptics",
   "assistantSettingsNoPromptPlaceholder": "No prompt yet",
-  "providersPageMultiSelectTooltip": "Multi-select"
-  ,
+  "providersPageMultiSelectTooltip": "Multi-select",
   "providersPageDeleteSelectedConfirmContent": "Delete selected providers? This cannot be undone.",
   "providersPageDeleteSelectedSnackbar": "Deleted selected providers",
   "providersPageExportSelectedTitle": "Export {count} providers",
   "@providersPageExportSelectedTitle": {
     "placeholders": {
-      "count": {"type": "int"}
+      "count": {
+        "type": "int"
+      }
     }
   },
   "providersPageExportCopyButton": "Copy",
@@ -1626,7 +1628,9 @@
   "networkProxyTestFailed": "Test failed: {error}",
   "@networkProxyTestFailed": {
     "placeholders": {
-      "error": { "type": "String" }
+      "error": {
+        "type": "String"
+      }
     }
   },
   "networkProxyNoUrl": "Please enter a URL",
@@ -1644,7 +1648,6 @@
   "providerDetailPageDetectSuccess": "Detection successful",
   "providerDetailPageDetectFailed": "Detection failed",
   "providerDetailPageDeleteAllModelsWarning": "This action cannot be undone.",
-  "displaySettingsPageOtherSettingsTitle": "Other Settings",
   "requestLogSettingTitle": "Request Logging",
   "requestLogSettingSubtitle": "When enabled, request/response details are written to logs/logs.txt (rotated daily).",
   "flutterLogSettingTitle": "Flutter Logging",

lib/l10n/app_localizations.dart

@@ -6,6 +6,7 @@ import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:intl/intl.dart' as intl;
 
 import 'app_localizations_en.dart';
+import 'app_localizations_tr.dart';
 import 'app_localizations_zh.dart';
 
 // ignore_for_file: type=lint
@@ -95,6 +96,7 @@ abstract class AppLocalizations {
   /// A list of this localizations delegate's supported locales.
   static const List<Locale> supportedLocales = <Locale>[
     Locale('en'),
+    Locale('tr'),
     Locale('zh'),
     Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hans'),
     Locale.fromSubtags(languageCode: 'zh', scriptCode: 'Hant'),
@@ -664,6 +666,12 @@ abstract class AppLocalizations {
   /// **'Spanish'**
   String get languageDisplaySpanish;
 
+  /// No description provided for @languageDisplayTurkish.
+  ///
+  /// In en, this message translates to:
+  /// **'Turkish'**
+  String get languageDisplayTurkish;
+
   /// No description provided for @languageSelectSheetTitle.
   ///
   /// In en, this message translates to:
@@ -8072,7 +8080,7 @@ class _AppLocalizationsDelegate
 
   @override
   bool isSupported(Locale locale) =>
-      <String>['en', 'zh'].contains(locale.languageCode);
+      <String>['en', 'tr', 'zh'].contains(locale.languageCode);
 
   @override
   bool shouldReload(_AppLocalizationsDelegate old) => false;
@@ -8097,6 +8105,8 @@ AppLocalizations lookupAppLocalizations(Locale locale) {
   switch (locale.languageCode) {
     case 'en':
       return AppLocalizationsEn();
+    case 'tr':
+      return AppLocalizationsTr();
     case 'zh':
       return AppLocalizationsZh();
   }

lib/l10n/app_localizations_en.dart

@@ -315,6 +315,9 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get languageDisplaySpanish => 'Spanish';
 
+  @override
+  String get languageDisplayTurkish => 'Turkish';
+
   @override
   String get languageSelectSheetTitle => 'Select Translation Language';