The image fills the 94% viewer with a transparent letterbox, so taps on
the dimmed canvas beside the image hit the viewer and did nothing — only
the 6% margin dismissed. Add onTapUp that dismisses when the tap lands
outside the actual painted-image rect (computed from the RenderImage +
applyBoxFit, transformed for any zoom/pan). Double-tap reset, scroll
zoom, pan, Esc, and the close button are unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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