feat(cli): Add /auth logout command to clear credentials and auth state (#13383)

packages/cli/src/ui/hooks/slashCommandProcessor.ts

@@ -4,7 +4,13 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { useCallback, useMemo, useEffect, useState } from 'react';
+import {
+  useCallback,
+  useMemo,
+  useEffect,
+  useState,
+  createElement,
+} from 'react';
 import { type PartListUnion } from '@google/genai';
 import process from 'node:process';
 import type { UseHistoryManagerReturn } from './useHistoryManager.js';
@@ -45,6 +51,11 @@ import {
 } from '../state/extensions.js';
 import { appEvents } from '../../utils/events.js';
 import { useAlternateBuffer } from './useAlternateBuffer.js';
+import {
+  LogoutConfirmationDialog,
+  LogoutChoice,
+} from '../components/LogoutConfirmationDialog.js';
+import { runExitCleanup } from '../../utils/cleanup.js';
 
 interface SlashCommandProcessorActions {
   openAuthDialog: () => void;
@@ -400,6 +411,22 @@ export const useSlashCommandProcessor = (
                     Date.now(),
                   );
                   return { type: 'handled' };
+                case 'logout':
+                  // Show logout confirmation dialog with Login/Exit options
+                  setCustomDialog(
+                    createElement(LogoutConfirmationDialog, {
+                      onSelect: async (choice: LogoutChoice) => {
+                        setCustomDialog(null);
+                        if (choice === LogoutChoice.LOGIN) {
+                          actions.openAuthDialog();
+                        } else {
+                          await runExitCleanup();
+                          process.exit(0);
+                        }
+                      },
+                    }),
+                  );
+                  return { type: 'handled' };
                 case 'dialog':
                   switch (result.dialog) {
                     case 'auth':