openai/gpt-chat-latest → B (2:1)

Side B simplifies the UI architecture by removing the `ExpandNewThreadForm` HTML action and its server-side dispatch, replacing the home page's extra toolbar with the same SSR `#new-thread-ui-slot` used on room pages. This eliminates duplicated interaction flow and dead code across `ui_html.rs`, `ui_action.rs`, and `feed.rs`, whereas Side A mainly adds UI enhancements (vote counts, HUD unpin button), styling, and supporting helpers/tests without a comparable architectural simplification.