openai/gpt-chat-latest → B (2:3)

Side B changes the auth flow to return HTML fragments and extends the shared Poem form interceptor to morph a form's innerHTML when the response contains HTML, enabling inline success/error handling without redirects while preserving existing empty-body POST behavior. Side A mixes a real bug fix (avoiding fallback to all items when the sibling pool is too small and passing delegate attribution out-of-band) with lower-impact cleanup such as removing the swap button and renaming `/vote/compare` to `/vote`, so its lasting design impact is somewhat smaller overall.