[Bug]: Registering with GitHub in the desktop app shows redirect URL mismatch error

[davwheat]

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/desktop

Steps to reproduce

1. Launch the app without being authed
2. Go to sign in
3. Choose to create an account
4. Click GitHub

Expected behavior

I should be able to register

Actual behavior

I see an error instead of an OAuth prompt

Impact

Major degradation or frequent failure

Version or commit

No response

Environment

macOS 27

Screenshots, recordings, or supporting files

Screenshot 2026-08-22 at 18.32.54.png

Workaround

Sign up with email+pwd