openai/gpt-5.2-chat → A (5:1)

Side A introduces a comprehensive theme system (cookie handling, POST /theme, layout refactor, JS/CSS changes), propagates theme context across nearly all HTML handlers, and adds room-aware URL handling throughout the RPC/API layer with new helpers and tests. It touches many core files and changes routing, rendering, and JSON outputs. Side B focuses on garden pin UX improvements (vote counts, HUD unpin via POST), related JS/CSS tweaks, and a targeted test—meaningful but much narrower in scope and architectural impact. Overall, Side A is substantially larger and more foundational.