openai/gpt-chat-latest → A (3:2)

Side A fixes multiple user-facing correctness issues in the voting flow: it passes the browser agent as an explicit delegate parameter instead of embedding it in DSL text, prevents an incorrect fallback to all items when a sibling pool has fewer than two candidates by returning no next pair, and updates routing/UI to the simplified `/vote` endpoint while removing the unnecessary swap button. Side B usefully centralizes base URL generation around `HOSTNAME`/`window.location.origin` and updates deployment configuration, but its changes are primarily configuration and URL handling rather than core application behavior.