openai/gpt-chat-latest → A (5:1)

Side A changes the ranking color algorithm from list-position-based gradients to score-based min–max normalization within each group, introducing a dedicated `score_gradient_t` helper, updating `rank_row_style` call sites, and adding focused tests for range mapping, tied scores, and stability. Side B is primarily a structural refactor that deletes the duplicate `forum.rs` in favor of `forum/mod.rs` and split modules; while valuable for maintainability and removing module ambiguity, it largely preserves existing behavior rather than improving project functionality.