Cannot press control-C to exit when signing in with autho

[jacob314]

What happened?

Accidentally signed in with an auth method I didn't want to.

I closed the browser page as I didn't want to auth only to realize my terminal was crashed with no ability to press ctrl-C until I did

Repro steps:

gemini

Code Assist login required.
Attempting to open authentication page in your browser.
Otherwise navigate to:

https://accounts.google.com/o/oauth2/v2/auth?redirect_uri=http%3A%2F%2Flocalhost%3A56034%2Foauth2callback&access_type=offline<redacted>.apps.googleusercontent.com


Waiting for authentication...

### What did you expect to happen?

Expect to press ctrl-C and stop the app even before Gemini CLI is interactive. We should duplicate techniques used to make sure Gemini CLI closes when in non-interactive mode to make this work.

### Client information

<details>
<summary>Client Information</summary>

Run `gemini` to enter the interactive CLI, then run the `/about` command.

```console
> /about
# paste output here

Login information

No response

Anything else we need to know?

No response

[rcjsuen]

I can't Ctrl+C out of the authentication either on macOS 26.0.1. I see the kind/bug label was removed last week. Is this no longer reproducible for anyone on the development team?