openai/gpt-chat-latest → B (4:1)

Side B simplifies the HTML flow by server-rendering the `#new-thread-ui-slot` on the home page, removing the redundant `ExpandNewThreadForm` UI action, its dispatch handler, enum variant, and associated parsing test. This eliminates an unnecessary client round-trip and duplicate code path, whereas Side A is a narrowly scoped fix that defines `GITHUB_API_BASE_URL` to prevent a missing-variable `NameError` in the GitHub OAuth callback.