Some cards showed blurry photos — feed RSS thumbnails (~90×90, e.g. Phys.org's
/tmb/ path) that load fine but upscale to mush in the banner. Add a header-based
dimension parser (PNG/GIF/JPEG/WebP, stdlib only) and fold a minimum-size gate
(450×250) into the image validation, alongside the existing load check. Images
we can't measure (SVG/AVIF) still pass on content-type. A re-prune clears the
small ones already stored so those cards fall back to the clean placeholder.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
thejayman77
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