openai/gpt-chat-latest → B (4:1)

Side B fixes a substantive concurrency bug by ensuring `tokio::sync::RwLock` read guards are dropped before later `read().await`/`write().await` calls, preventing self-deadlocks in `RoomCreate` and `RoomGrant`, and adds an integration test covering room creation. Side A is a useful UI refactor that replaces a hard-coded `#entity-section` target with per-item selectors and reuses `entity_section` rendering in the vote view, but it is primarily structural and less critical than eliminating a deadlock in core RPC handling.