fix(mcp): Display OAuth authentication messages in CLI UI instead of debug console (#6919)

Co-authored-by: Yoichiro Tanaka <yoichiro6642@gmail.com>
Co-authored-by: Jacob Richman <jacob314@gmail.com>

packages/cli/src/utils/events.ts

@@ -9,6 +9,7 @@ import { EventEmitter } from 'node:events';
 export enum AppEvent {
   OpenDebugConsole = 'open-debug-console',
   LogError = 'log-error',
+  OauthDisplayMessage = 'oauth-display-message',
 }
 
 export const appEvents = new EventEmitter();