GCM does not open web browser with oauth flow for oauth-enabled provider on macOS

Version

2.9.1+6760f0ef069c994aa2bb1d703fb374986ee82a3e

Operating system

macOS

OS version or distribution

macOS Tahoe 26.6.2

Git hosting provider(s)

Other - please describe below

Other hosting provider

Self hosted Forgejo instance, with oauth configured.

(Azure DevOps only) What format is your remote URL?

None

Can you access the remote repository directly in the browser?

Yes, I can access the repository

Expected behavior

GCM opens browser window to complete oauth flow on my forgejo instance.

Actual behavior

GCM opens popup prompting for username and password - which is incompatible with my instance's configuration.

Logs

No response