openai/gpt-chat-latest → A (5:2)

Side A delivers substantial new functionality and infrastructure: it adds a dedicated pairwise voting page, pair-selection logic that prioritizes bridging disconnected ranking components, in-place UI morphing after votes, ID normalization via `ItemId::from_storage`, and accompanying integration/tests. Side B fixes an important operational issue by requiring OAuth when configured, refreshing tokens after 401/403 responses, and improving error handling, but it is a narrower reliability improvement compared with the broader, lasting feature and architectural additions in Side A.