openai/gpt-chat-latest → A (3:2)

Side A adds a substantive user-facing capability: `/vote?pool=` can automatically select child-item pairs, keeps pool context through vote submission and next-pair navigation, and exposes the feature via a new "vote on children" UI link. Side B is a broad architectural refactor that centralizes path and URL types into `slug_types::paths` and updates many call sites, improving consistency and type safety, but it mostly reorganizes existing behavior rather than adding new functionality.