openai/gpt-chat-latest → B (1:4)

Side B implements substantive product behavior across the UI: it adds pairwise vote counts in the garden view, changes the pinned-item HUD from a permalink to an unpin action via `POST /ui`, updates styling, and adds both unit and browser tests to verify the new behavior. Side A is a small but useful bug fix that defines `GITHUB_API_BASE_URL` with a default to prevent a `NameError`, but its scope and long-term impact are much narrower.