A "View full image" button appears in the single-post hero alongside
the return link. Clicking the lightbox main image also opens the same
overlay from any page. The overlay is pure image on a near-black
backdrop; click backdrop, close button, or Escape to dismiss.
Escape is layered: closes zoom first, then lightbox if zoom is not open.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
valknar
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