7a5c22593a
Add markdown-to-HTML rendering for assistant messages using Markdig with HTML sanitization. Includes cached rendering to avoid lag during streaming, styled markdown elements (code blocks, tables, lists, blockquotes) within chat bubbles, and 18 unit tests covering rendering and XSS prevention. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>