openai/gpt-chat-latest → B (8:1)

Side B makes a substantive architectural improvement by replacing the parser graph's Rc<RefCell>-based mutable structure with an immutable HashMap, requiring handlers to be Send + Sync, and caching the graph in a OnceLock so it is built once instead of on every parse. Side A only adds a new CSS stylesheet with presentation rules, which improves appearance but does not change core behavior or fix functionality.