fix(cli): block discontinued qwen-oauth model selection in ModelDialog (#3299)

PR #3291 discontinued the Qwen OAuth free tier but intentionally left the
ModelDialog unchanged, relying on server rejection for qwen-oauth models.
This follow-up adds proper UI handling consistent with the AuthDialog:

- Mark qwen-oauth model entries with "(Discontinued)" label and warning color
- Replace descriptions with "Discontinued — switch to Coding Plan or API Key"
- Block selection with inline error message instead of calling switchModel
- Show ⚠ discontinuation notice in the detail panel for highlighted entries
- Runtime OAuth models (existing cached tokens) remain selectable until server
  rejects them (soft cutoff principle from PR #3291)
- Add i18n strings for the new error message across all 7 locale files

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

packages/cli/src/i18n/locales/de.js

@@ -1251,6 +1251,8 @@ export default {
     'Das kostenlose Qwen OAuth-Kontingent wurde am 2026-04-15 eingestellt. Führen Sie /auth aus, um den Anbieter zu wechseln.',
   'Qwen OAuth free tier was discontinued on 2026-04-15. Please select Coding Plan or API Key instead.':
     'Das kostenlose Qwen OAuth-Kontingent wurde am 2026-04-15 eingestellt. Bitte wählen Sie Coding Plan oder API Key.',
+  'Qwen OAuth free tier was discontinued on 2026-04-15. Please select a model from another provider or run /auth to switch.':
+    'Das kostenlose Qwen OAuth-Angebot wurde am 2026-04-15 eingestellt. Bitte wählen Sie ein Modell eines anderen Anbieter oder führen Sie /auth aus, um zu wechseln.',
   '\n⚠ Qwen OAuth free tier was discontinued on 2026-04-15. Please select another option.\n':
     '\n⚠ Das kostenlose Qwen OAuth-Kontingent wurde am 2026-04-15 eingestellt. Bitte wählen Sie eine andere Option.\n',
   'Paid \u00B7 Up to 6,000 requests/5 hrs \u00B7 All Alibaba Cloud Coding Plan Models':

packages/cli/src/i18n/locales/en.js

@@ -1304,6 +1304,8 @@ export default {
     'Qwen OAuth free tier was discontinued on 2026-04-15. Run /auth to switch provider.',
   'Qwen OAuth free tier was discontinued on 2026-04-15. Please select Coding Plan or API Key instead.':
     'Qwen OAuth free tier was discontinued on 2026-04-15. Please select Coding Plan or API Key instead.',
+  'Qwen OAuth free tier was discontinued on 2026-04-15. Please select a model from another provider or run /auth to switch.':
+    'Qwen OAuth free tier was discontinued on 2026-04-15. Please select a model from another provider or run /auth to switch.',
   '\n⚠ Qwen OAuth free tier was discontinued on 2026-04-15. Please select another option.\n':
     '\n⚠ Qwen OAuth free tier was discontinued on 2026-04-15. Please select another option.\n',
   'Paid \u00B7 Up to 6,000 requests/5 hrs \u00B7 All Alibaba Cloud Coding Plan Models':

packages/cli/src/i18n/locales/fr.js

@@ -1335,6 +1335,8 @@ export default {
     'Le niveau gratuit Qwen OAuth a été abandonné le 2026-04-15. Exécutez /auth pour changer de fournisseur.',
   'Qwen OAuth free tier was discontinued on 2026-04-15. Please select Coding Plan or API Key instead.':
     'Le niveau gratuit Qwen OAuth a été abandonné le 2026-04-15. Veuillez sélectionner Coding Plan ou API Key.',
+  'Qwen OAuth free tier was discontinued on 2026-04-15. Please select a model from another provider or run /auth to switch.':
+    "Le niveau gratuit de Qwen OAuth a été abandonné le 2026-04-15. Veuillez sélectionner un modèle d'un autre fournisseur ou exécuter /auth pour changer.",
   '\n⚠ Qwen OAuth free tier was discontinued on 2026-04-15. Please select another option.\n':
     '\n⚠ Le niveau gratuit Qwen OAuth a été abandonné le 2026-04-15. Veuillez sélectionner une autre option.\n',
   'Paid \u00B7 Up to 6,000 requests/5 hrs \u00B7 All Alibaba Cloud Coding Plan Models':

packages/cli/src/i18n/locales/ja.js

@@ -972,6 +972,8 @@ export default {
     'Qwen OAuth 無料枠は 2026-04-15 に終了しました。/auth を実行してプロバイダーを切り替えてください。',
   'Qwen OAuth free tier was discontinued on 2026-04-15. Please select Coding Plan or API Key instead.':
     'Qwen OAuth 無料枠は 2026-04-15 に終了しました。Coding Plan または API Key を選択してください。',
+  'Qwen OAuth free tier was discontinued on 2026-04-15. Please select a model from another provider or run /auth to switch.':
+    'Qwen OAuth無料プランは2026-04-15に終了しました。他のプロバイダーのモデルを選択するか、/authを実行して切り替えてください。',
   '\n⚠ Qwen OAuth free tier was discontinued on 2026-04-15. Please select another option.\n':
     '\n⚠ Qwen OAuth 無料枠は 2026-04-15 に終了しました。他のオプションを選択してください。\n',
   'Paid \u00B7 Up to 6,000 requests/5 hrs \u00B7 All Alibaba Cloud Coding Plan Models':

packages/cli/src/i18n/locales/pt.js

@@ -1257,6 +1257,8 @@ export default {
     'O nível gratuito do Qwen OAuth foi descontinuado em 2026-04-15. Execute /auth para trocar de provedor.',
   'Qwen OAuth free tier was discontinued on 2026-04-15. Please select Coding Plan or API Key instead.':
     'O nível gratuito do Qwen OAuth foi descontinuado em 2026-04-15. Selecione Coding Plan ou API Key.',
+  'Qwen OAuth free tier was discontinued on 2026-04-15. Please select a model from another provider or run /auth to switch.':
+    'O nível gratuito do Qwen OAuth foi descontinuado em 2026-04-15. Por favor, selecione um modelo de outro provedor ou execute /auth para trocar.',
   '\n⚠ Qwen OAuth free tier was discontinued on 2026-04-15. Please select another option.\n':
     '\n⚠ O nível gratuito do Qwen OAuth foi descontinuado em 2026-04-15. Selecione outra opção.\n',
   'Paid \u00B7 Up to 6,000 requests/5 hrs \u00B7 All Alibaba Cloud Coding Plan Models':

packages/cli/src/i18n/locales/ru.js

@@ -1181,6 +1181,8 @@ export default {
     'Бесплатный уровень Qwen OAuth прекращён 2026-04-15. Выполните /auth для смены провайдера.',
   'Qwen OAuth free tier was discontinued on 2026-04-15. Please select Coding Plan or API Key instead.':
     'Бесплатный уровень Qwen OAuth прекращён 2026-04-15. Выберите Coding Plan или API Key.',
+  'Qwen OAuth free tier was discontinued on 2026-04-15. Please select a model from another provider or run /auth to switch.':
+    'Бесплатный уровень Qwen OAuth был прекращен 2026-04-15. Пожалуйста, выберите модель от другого провайдера или выполните /auth для переключения.',
   '\n⚠ Qwen OAuth free tier was discontinued on 2026-04-15. Please select another option.\n':
     '\n⚠ Бесплатный уровень Qwen OAuth прекращён 2026-04-15. Выберите другую опцию.\n',
   'Paid \u00B7 Up to 6,000 requests/5 hrs \u00B7 All Alibaba Cloud Coding Plan Models':

packages/cli/src/i18n/locales/zh.js

@@ -1233,6 +1233,8 @@ export default {
     'Qwen OAuth 免费额度已于 2026-04-15 停用。请运行 /auth 切换服务商。',
   'Qwen OAuth free tier was discontinued on 2026-04-15. Please select Coding Plan or API Key instead.':
     'Qwen OAuth 免费额度已于 2026-04-15 停用。请选择 Coding Plan 或 API Key。',
+  'Qwen OAuth free tier was discontinued on 2026-04-15. Please select a model from another provider or run /auth to switch.':
+    'Qwen OAuth免费层已于2026-04-15停止服务。请选择其他提供商的模型或运行 /auth 切换。',
   '\n⚠ Qwen OAuth free tier was discontinued on 2026-04-15. Please select another option.\n':
     '\n⚠ Qwen OAuth 免费额度已于 2026-04-15 停用。请选择其他选项。\n',
   'Paid \u00B7 Up to 6,000 requests/5 hrs \u00B7 All Alibaba Cloud Coding Plan Models':

packages/cli/src/ui/components/ModelDialog.test.tsx

@@ -192,8 +192,8 @@ describe('<ModelDialog />', () => {
     expect(mockedSelect).toHaveBeenCalledTimes(1);
   });
 
-  it('calls config.switchModel and onClose when DescriptiveRadioButtonSelect.onSelect is triggered', async () => {
-    const { props, mockConfig, mockSettings } = renderComponent(
+  it('blocks qwen-oauth model selection with an error message (discontinued)', async () => {
+    const { props, mockConfig } = renderComponent(
       {},
       {
         getAvailableModelsForAuthType: vi.fn((t: AuthType) => {
@@ -214,25 +214,79 @@ describe('<ModelDialog />', () => {
 
     await childOnSelect(`${AuthType.QWEN_OAUTH}::${DEFAULT_QWEN_MODEL}`);
 
-    expect(mockConfig?.switchModel).toHaveBeenCalledWith(
-      AuthType.QWEN_OAUTH,
-      DEFAULT_QWEN_MODEL,
+    // qwen-oauth is discontinued — switchModel should NOT be called
+    expect(mockConfig?.switchModel).not.toHaveBeenCalled();
+    // Dialog should NOT close (user stays in the dialog to see the error)
+    expect(props.onClose).not.toHaveBeenCalled();
+  });
+
+  it('calls config.switchModel and onClose when selecting a non-OAuth model', async () => {
+    const switchModel = vi.fn().mockResolvedValue(undefined);
+    const getAuthType = vi.fn(() => AuthType.USE_OPENAI);
+    const getAvailableModelsForAuthType = vi.fn((t: AuthType) => {
+      if (t === AuthType.USE_OPENAI) {
+        return [{ id: 'gpt-4', label: 'GPT-4', authType: t }];
+      }
+      if (t === AuthType.QWEN_OAUTH) {
+        return getFilteredQwenModels().map((m) => ({
+          id: m.id,
+          label: m.label,
+          authType: AuthType.QWEN_OAUTH,
+        }));
+      }
+      return [];
+    });
+
+    const { props, mockSettings } = renderComponent({}, {
+      getModel: vi.fn(() => 'gpt-4'),
+      getAuthType,
+      switchModel,
+      getAvailableModelsForAuthType,
+      getAllConfiguredModels: vi.fn(() => [
+        ...getFilteredQwenModels().map((m) => ({
+          id: m.id,
+          label: m.label,
+          description: m.description || '',
+          authType: AuthType.QWEN_OAUTH,
+        })),
+        {
+          id: 'gpt-4',
+          label: 'GPT-4',
+          description: 'GPT-4 model',
+          authType: AuthType.USE_OPENAI,
+        },
+      ]),
+      getContentGeneratorConfig: vi.fn(() => ({
+        authType: AuthType.USE_OPENAI,
+        model: 'gpt-4',
+      })),
+    } as unknown as Partial<Config>);
+
+    const childOnSelect = mockedSelect.mock.calls[0][0].onSelect;
+    expect(childOnSelect).toBeDefined();
+
+    // Select a non-OAuth model (USE_OPENAI)
+    await childOnSelect(`${AuthType.USE_OPENAI}::gpt-4`);
+
+    expect(switchModel).toHaveBeenCalledWith(
+      AuthType.USE_OPENAI,
+      'gpt-4',
       undefined,
     );
     expect(mockSettings.setValue).toHaveBeenCalledWith(
       SettingScope.User,
       'model.name',
-      DEFAULT_QWEN_MODEL,
+      'gpt-4',
     );
     expect(mockSettings.setValue).toHaveBeenCalledWith(
       SettingScope.User,
       'security.auth.selectedType',
-      AuthType.QWEN_OAUTH,
+      AuthType.USE_OPENAI,
     );
     expect(props.onClose).toHaveBeenCalledTimes(1);
   });
 
-  it('calls config.switchModel and persists authType+model when selecting a different authType', async () => {
+  it('blocks switching to qwen-oauth from another authType (discontinued)', async () => {
     const switchModel = vi.fn().mockResolvedValue(undefined);
     const getAuthType = vi.fn(() => AuthType.USE_OPENAI);
     const getAvailableModelsForAuthType = vi.fn((t: AuthType) => {
@@ -253,39 +307,25 @@ describe('<ModelDialog />', () => {
       getAuthType,
       getModel: vi.fn(() => 'gpt-4'),
       getContentGeneratorConfig: vi.fn(() => ({
-        authType: AuthType.QWEN_OAUTH,
-        model: DEFAULT_QWEN_MODEL,
+        authType: AuthType.USE_OPENAI,
+        model: 'gpt-4',
       })),
-      // Add switchModel to the mock object (not the type)
       switchModel,
       getAvailableModelsForAuthType,
     };
 
-    const { props, mockSettings } = renderComponent(
+    const { props } = renderComponent(
       {},
-      // Cast to Config to bypass type checking, matching the runtime behavior
       mockConfigWithSwitchAuthType as unknown as Partial<Config>,
     );
 
     const childOnSelect = mockedSelect.mock.calls[0][0].onSelect;
     await childOnSelect(`${AuthType.QWEN_OAUTH}::${DEFAULT_QWEN_MODEL}`);
 
-    expect(switchModel).toHaveBeenCalledWith(
-      AuthType.QWEN_OAUTH,
-      DEFAULT_QWEN_MODEL,
-      { requireCachedCredentials: true },
-    );
-    expect(mockSettings.setValue).toHaveBeenCalledWith(
-      SettingScope.User,
-      'model.name',
-      DEFAULT_QWEN_MODEL,
-    );
-    expect(mockSettings.setValue).toHaveBeenCalledWith(
-      SettingScope.User,
-      'security.auth.selectedType',
-      AuthType.QWEN_OAUTH,
-    );
-    expect(props.onClose).toHaveBeenCalledTimes(1);
+    // qwen-oauth is discontinued — switchModel should NOT be called
+    expect(switchModel).not.toHaveBeenCalled();
+    // Dialog should NOT close
+    expect(props.onClose).not.toHaveBeenCalled();
   });
 
   it('passes onHighlight to DescriptiveRadioButtonSelect', () => {

packages/cli/src/ui/components/ModelDialog.tsx

@@ -213,11 +213,19 @@ export function ModelDialog({
           const value =
             isRuntime && snapshotId ? snapshotId : `${t2}::${model.id}`;
 
+          const isQwenOAuth = t2 === AuthType.QWEN_OAUTH;
+
           const title = (
             <Text>
               <Text
                 bold
-                color={isRuntime ? theme.status.warning : theme.text.accent}
+                color={
+                  isQwenOAuth
+                    ? theme.status.warning
+                    : isRuntime
+                      ? theme.status.warning
+                      : theme.text.accent
+                }
               >
                 [{t2}]
               </Text>
@@ -225,16 +233,22 @@ export function ModelDialog({
               {isRuntime && (
                 <Text color={theme.status.warning}> (Runtime)</Text>
               )}
+              {isQwenOAuth && !isRuntime && (
+                <Text color={theme.status.warning}> ({t('Discontinued')})</Text>
+              )}
             </Text>
           );
 
-          // Include runtime indicator in description
+          // Include runtime / discontinued indicator in description
           let description = model.description || '';
           if (isRuntime) {
             description = description
               ? `${description} (Runtime)`
               : 'Runtime model';
           }
+          if (isQwenOAuth && !isRuntime) {
+            description = t('Discontinued — switch to Coding Plan or API Key');
+          }
 
           return {
             value,
@@ -323,6 +337,25 @@ export function ModelDialog({
         return;
       }
 
+      // Block selection of discontinued qwen-oauth models
+      // (only block non-runtime OAuth; runtime OAuth models from existing
+      //  cached tokens are still allowed to work until the server rejects them)
+      const isQwenOAuthSelection =
+        selected.startsWith(`${AuthType.QWEN_OAUTH}::`) ||
+        (selected.startsWith('$runtime|') &&
+          selected.split('|')[1] === AuthType.QWEN_OAUTH);
+      const isRuntimeOAuthSelection = selected.startsWith(
+        `$runtime|${AuthType.QWEN_OAUTH}|`,
+      );
+      if (isQwenOAuthSelection && !isRuntimeOAuthSelection) {
+        setErrorMessage(
+          t(
+            'Qwen OAuth free tier was discontinued on 2026-04-15. Please select a model from another provider or run /auth to switch.',
+          ),
+        );
+        return;
+      }
+
       let after: ContentGeneratorConfig | undefined;
       let effectiveAuthType: AuthType | undefined;
       let effectiveModelId = selected;
@@ -461,6 +494,14 @@ export function ModelDialog({
             borderRight={false}
             borderColor={theme.border.default}
           />
+          {highlightedEntry.authType === AuthType.QWEN_OAUTH &&
+            !highlightedEntry.isRuntime && (
+              <Box marginTop={1}>
+                <Text color={theme.status.warning}>
+                  ⚠ {t('Discontinued — switch to Coding Plan or API Key')}
+                </Text>
+              </Box>
+            )}
           <DetailRow
             label={t('Modality')}
             value={formatModalities(highlightedEntry.model.modalities)}