chat-ui

79b36723 - fix: replace isomorphic-dompurify with dompurify to fix ESM require error

fix: replace isomorphic-dompurify with dompurify to fix ESM require error isomorphic-dompurify is CJS-only and broke in prod after the dependency cleanup restructured the lockfile. CodeBlock is client-only so the isomorphic wrapper (and its jsdom dep) was unnecessary.