Blockquote And Emphasis Rendering

[llm-ui](https://llm-ui.com) markdown block.

Unique: Produces semantic HTML tags (strong, em, del, blockquote) rather than span wrappers, enabling proper accessibility and allowing CSS to style emphasis without class dependencies

vs others: Semantic HTML output is more accessible and SEO-friendly than div-based emphasis, and integrates better with browser text selection and copying