A data-lightbox element gets a tap target (click cursor) over its region;
DrawingCard exposes an onLightbox callback, which the conversation wires to
open the whole drawing in a ClideLightbox (zoomable). Completes the
per-object overlay — captions + lightbox — and T-318's defined scope.
Widget-tested (the tap fires the callback).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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