[BUG] Claude on MacOS does not use default browser for logging in

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

The MacOS desktop app always opens Safari when trying to login with SSO. I do not use Safari, and do not have my passwords stored in it -- and I don't want to sign in to Google in that browser.

What Should Happen?

Just like the CLI and VS Code extension, the Claude app should use the _default_ browser on the system, rather than forcing the use of Safari.

Error Messages/Logs

Steps to Reproduce

1. Download the Claude app
2. Click "Sign in with Google"
3. Observe that Safari opens, rather than the default browser

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

1.9659.2

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_