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feat: render Mermaid diagrams with an interactive viewer - #7
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Mermaid fences currently appear as raw code in chat, and large diagrams cannot be inspected comfortably. This adds themed inline rendering and an expanded viewer with fit, center, pan, zoom, mouse, touch, and keyboard controls across web, desktop, and mobile.
Invalid diagrams retain their source and expose retry and a repair draft action. Streaming fences wait until complete. Rendering is lazy, cached, isolated in SVG images, and bundled locally for mobile use without a CDN.
The commits separate shared rendering and dependency setup, web integration, and mobile integration.
Validation: 54 focused tests passed, scoped web/mobile/client-runtime typechecks and formatting passed, and web production build plus Android Expo export succeeded. Browser checks covered both themes, pan/zoom, keyboard focus and Escape, invalid source, and repair drafts. The exported mobile DOM viewer passed offline rendering and touch-pinch checks; a native device or simulator was not available.
Visual evidence follows below.
Pan and zoom recording · Offline mobile DOM viewer capture