openai/gpt-5.3-chat → A (3:1)

Commit A makes a deeper, cross-cutting change to how ranking visuals are computed, replacing position-based coloring with score-based normalization, updating function signatures, call sites, and adding several targeted tests. It alters core UI behavior and improves consistency as data scales. Commit B is a focused data-cleanup improvement (skipping pinned posts) with a small helper and a single test, valuable but much narrower in scope and impact.