openai/gpt-chat-latest → B (3:2)

Side B changes the auth flow architecture by returning HTML fragments instead of redirects, refactoring the username form into reusable rendering helpers, and extending the shared Poem JavaScript to morph a form's innerHTML when a POST returns HTML, enabling inline form updates without page reloads while preserving existing empty-response behavior. Side A is a solid UX improvement that makes ranked child-group pin icons submit the existing unpin action and adds browser coverage, but it is a narrower feature built on an existing flow rather than a reusable interaction pattern.