openai/gpt-chat-latest → A (3:2)

Side A simplifies the UI architecture by removing the `ExpandNewThreadForm` action and its server-side handler, instead server-rendering the `#new-thread-ui-slot` directly on the home page with the same collapsed compose/login-hint behavior used elsewhere. This eliminates duplicated flow and dead RPC parsing/tests while making public home consistent with room pages. Side B improves test maintenance by auto-discovering `test.*` namespaces, but it is a build-configuration convenience rather than a functional or architectural improvement.