openai/gpt-chat-latest → B (4:1)

Side B fixes URL generation to use `display_path()` instead of stored full paths for vote compare and pool links, aligning hrefs with the user-facing path format, and greatly strengthens the browser test by exercising all 45 pairwise votes and verifying the final RPC ranking. Side A is primarily a UI correctness change (per-group rank gradient highlighting plus vote-history slider visualization) with useful regression tests, but its impact is narrower than the routing fix and comprehensive end-to-end validation added in Side B.