[ALL KITS] Fix redirect loop on login

[dustinsgoodman]

From @tvanantwerp:

During signing in non-Chrome browsers, there is a redirect loop where the user gets stuck at the /signin route despite successfully logging in.

Confirmed issue on Firefox & Safari.

Acceptance

• Fix redirect login loop

[kodejuice]

PR #586

Currently blocked, may need access to api.starter.dev code to debug, as the endpoint doesn't return the access_token on non chromium browsers (like Firefox).

[dustinsgoodman]

The code is in this repo in the backend project.