openai/gpt-chat-latest → A (4:1)

Side A implements a lasting UX and architecture improvement for authentication by replacing redirect-based flows with HTML fragments, adding reusable rendering helpers, updating the shared form interception logic to morph non-empty responses, and integrating the auth pages back into the common layout. Side B is a valuable but narrowly scoped bug fix that defines a missing GITHUB_API_BASE_URL configuration with a sensible default to prevent a NameError in the OAuth callback.