openai/gpt-chat-latest → B (3:2)

Side B strengthens the project's type safety by changing `resolve_item` to return `CanonicalItemUrl` instead of raw `String`, propagating canonical URL types through validation, ranking, pair selection, and RPC code, and adding `Deref<str>` implementations to reduce string conversions. Side A delivers meaningful UI improvements (fullscreen compare page, live preview morph, improved vote history ordering, and tests), but much of it is presentation-oriented, whereas B's refactor reduces incorrect string handling across core APIs and provides a more durable internal design.