openai/gpt-chat-latest → A (5:2)

Side A replaces many raw `String` path usages with the `CanonicalItemUrl` type throughout validation, ranking, pair selection, and RPCs, changes `resolve_item` to return the typed value, and adds `Deref<str>` for URL newtypes to reduce conversions while improving type safety and API consistency. Side B improves the authentication flow by returning HTML fragments for inline form updates via the existing JS interceptor, but its impact is primarily user-interface behavior rather than a broad structural improvement to correctness and maintainability.