openai/gpt-chat-latest → A (4:1)

Side A introduces the core vote HUD architecture by extracting a new fixed bottom control form, restructuring the compare page, updating JavaScript to drive the slider state and accessibility, and adding substantial CSS plus integration/tests to support the new always-visible workflow. Side B is a refinement on top of that foundation, improving layout stability with fixed column widths and making the slider track visually indicate the leading side via a new data attribute, but it is primarily a UX polish rather than a fundamental capability.