openai/gpt-chat-latest → A (4:1)

Side A delivers broad, lasting functionality by introducing persistent theme handling (cookie-backed theme selection that survives authentication), propagating theme context through page rendering, and fixing room-aware URL generation across the RPC/API with dedicated helper functions and tests for private-room paths. Side B adds a useful but narrowly scoped RoomList RPC/CLI command with integration tests that simply enumerates rooms granted to the authenticated user, making it a smaller feature with less architectural impact.