~anthropic/claude-sonnet-latest → B (75:25)

Side B is a substantial, structural refactor (CanonicalItemUrl -> ItemId enum) touching reducer, ranking, RPC, and types crates with updated tests throughout, which is a deeper architectural investment even though it's riskier and less polished (e.g. Opaque fallback variant, unwraps). Side A is a small, well-scoped UI feature (clickable unpin icon) with a matching CSS and browser test update, useful but narrow in scope and impact compared to the identity-model overhaul in B.