openai/gpt-chat-latest → B (9:1)

Commit B delivers a substantive user-facing fix for vote comparison highlighting and polarity. It corrects ranking highlight behavior across groups, reworks vote history visualization to use consistent slider semantics, adds winner labeling, updates CSS and JavaScript to keep visual feedback aligned with vote direction, removes obsolete code, and introduces multiple targeted tests covering orientation, slider mapping, highlighting, and end-to-end ranking behavior. Commit A is a small maintenance change that removes a redundant dead-code guard in the reducer after validating that zero ratios are already rejected upstream, with corresponding test updates. While useful for code cleanliness and correctness, its scope and impact are much smaller than B's.