openai/gpt-chat-latest → B (3:2)

Side B substantially expands core web functionality by wiring browser session cookies into authentication, adding login/logout, enabling authenticated web posting through the existing RPC layer, and introducing room-aware routing with access control for private forums. Side A usefully refactors Reddit entity fetching into an SSE-based streaming flow with progress/error events and modularizes fetch UI, but it is more localized, whereas B establishes broader application capabilities that affect authentication, routing, and posting across the project.