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 in RPC handlers, preventing deadlocks, and adds an integration test covering private room creation. Side A mainly refactors the HTML CLI panel into a grouped, click-to-copy UI with CSS updates and adds assertions that CLI strings are safe for single-quoted JavaScript, which improves usability but has less lasting impact than the correctness fix.