Adds a Raw/Preview toggle to the success state so users can see the rendered Markdown before copying or downloading. Includes a dependency-free markdown->HTML renderer (required by the extension CSP, which forbids loading external scripts) covering headings, emphasis, inline/fenced code, links, images, blockquotes, rules, nested lists, and tables. The preview updates live as the (now editable) output is edited.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com