Module elements/gallery

Renderer for Wikidot [[gallery]] elements.

Emits a rationalized, theme-compatible markup: the Wikidot class names gallery-box / gallery-item <size> / with-lb are kept, but the legacy table wrapper is replaced with a plain <figure> per item.

<div class="gallery-box">
  <figure class="gallery-item thumbnail">
    <a href="/local--files/page/a.jpg" class="with-lb"><img src="..." alt=""/></a>
  </figure>
</div>
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• with-lb marks lightbox targets (see initGallery in @wdprlib/runtime): anchors whose href is the image itself, i.e. items without an explicit link and without a * new-window prefix.
• data-viewer="false" on the box disables the lightbox (viewer="no").
• Items whose source is a dangerous URL are skipped; a dangerous link is ignored (the item then links to its own image).