JosephHy/dsh-md-plus

Markdown display enhancements for the DSH Web chat, applied on top of the host renderer rather than replacing it: code blocks become cards with a language label and icon-only wrap and copy buttons, long code blocks, tables and Mermaid diagrams fold behind an expand control, Mermaid fences render as SVG with a diagram and code toggle, a fullscreen viewer with wheel zoom, drag and double-click to fit, and SVG or PNG export, tables get a sticky header and CSV or Markdown copy buttons, and a settings panel adjusts the diagram palette, code font size, the default diagram view and the three fold thresholds.