The unified drawing card's primitive layer is SVG, not a bespoke
{type:"rect"} JSON vocabulary; the clide-owned CustomPaint SVG renderer
(T-320) is the engine the rest builds on. Templates lower to SVG; a thin
Flutter overlay carries label/description captions + lightbox, anchored
via data-* attributes; the graph template stays a live widget. Inverts
the former T-320 → T-318 dependency. Raised by the user: "if we are close
to svg, are we not better off extending svg instead?"
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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