fix: add --fast hint to /model description for discoverability (#3086)

Add "(--fast for suggestion model)" to the /model command description
so users can discover the feature from the command list, since --fast
completion no longer appears on empty input.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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

@@ -989,7 +989,8 @@ export default {
   // ============================================================================
   // Commands - Model
   // ============================================================================
-  'Switch the model for this session': 'Modell für diese Sitzung wechseln',
+  'Switch the model for this session (--fast for suggestion model)':
+    'Modell für diese Sitzung wechseln (--fast für Vorschlagsmodell)',
   'Set a lighter model for prompt suggestions and speculative execution':
     'Leichteres Modell für Eingabevorschläge und spekulative Ausführung festlegen',
   'Content generator configuration not available.':

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

@@ -1151,7 +1151,8 @@ export default {
   // ============================================================================
   // Commands - Model
   // ============================================================================
-  'Switch the model for this session': 'Switch the model for this session',
+  'Switch the model for this session (--fast for suggestion model)':
+    'Switch the model for this session (--fast for suggestion model)',
   'Set a lighter model for prompt suggestions and speculative execution':
     'Set a lighter model for prompt suggestions and speculative execution',
   'Content generator configuration not available.':

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

@@ -743,7 +743,8 @@ export default {
   'Failed to generate summary - no text content received from LLM response':
     'サマリーの生成に失敗 - LLMレスポンスからテキストコンテンツを受信できませんでした',
   // Model
-  'Switch the model for this session': 'このセッションのモデルを切り替え',
+  'Switch the model for this session (--fast for suggestion model)':
+    'このセッションのモデルを切り替え（--fast で提案モデルを設定）',
   'Set a lighter model for prompt suggestions and speculative execution':
     'プロンプト提案と投機的実行用の軽量モデルを設定',
   'Content generator configuration not available.':

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

@@ -996,7 +996,8 @@ export default {
   // ============================================================================
   // Commands - Model
   // ============================================================================
-  'Switch the model for this session': 'Trocar o modelo para esta sessão',
+  'Switch the model for this session (--fast for suggestion model)':
+    'Trocar o modelo para esta sessão (--fast para modelo de sugestões)',
   'Set a lighter model for prompt suggestions and speculative execution':
     'Definir modelo mais leve para sugestões de prompt e execução especulativa',
   'Content generator configuration not available.':

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

@@ -997,7 +997,8 @@ export default {
   // ============================================================================
   // Команды - Модель
   // ============================================================================
-  'Switch the model for this session': 'Переключение модели для этой сессии',
+  'Switch the model for this session (--fast for suggestion model)':
+    'Переключение модели для этой сессии (--fast для модели подсказок)',
   'Set a lighter model for prompt suggestions and speculative execution':
     'Установить облегчённую модель для подсказок и спекулятивного выполнения',
   'Content generator configuration not available.':

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

@@ -1092,7 +1092,8 @@ export default {
   // ============================================================================
   // Commands - Model
   // ============================================================================
-  'Switch the model for this session': '切换此会话的模型',
+  'Switch the model for this session (--fast for suggestion model)':
+    '切换此会话的模型（--fast 可设置建议模型）',
   'Set a lighter model for prompt suggestions and speculative execution':
     '设置用于输入建议和推测执行的轻量模型',
   'Content generator configuration not available.': '内容生成器配置不可用',

packages/cli/src/ui/commands/modelCommand.test.ts

@@ -33,7 +33,9 @@ describe('modelCommand', () => {
 
   it('should have the correct name and description', () => {
     expect(modelCommand.name).toBe('model');
-    expect(modelCommand.description).toBe('Switch the model for this session');
+    expect(modelCommand.description).toBe(
+      'Switch the model for this session (--fast for suggestion model)',
+    );
   });
 
   it('should return error when config is not available', async () => {

packages/cli/src/ui/commands/modelCommand.ts

@@ -17,7 +17,7 @@ import { getPersistScopeForModelSelection } from '../../config/modelProvidersSco
 export const modelCommand: SlashCommand = {
   name: 'model',
   get description() {
-    return t('Switch the model for this session');
+    return t('Switch the model for this session (--fast for suggestion model)');
   },
   kind: CommandKind.BUILT_IN,
   completion: async (_context, partialArg) => {