openai/gpt-chat-latest → A (9:2)

Side A adds substantial, lasting application functionality: browser session cookies, login/logout flows, web posting, room-aware forum routing and authorization, reusable thread navigation, and new HTTP routes integrating the UI with existing RPC logic. Side B is a focused maintenance fix for the test infrastructure, correcting mock OAuth request parsing, redirect handling, form reading, null safety, and Playwright selectors so end-to-end auth tests work again, but it primarily improves testing rather than core product capabilities.