Replaced the wporg-plugins-2024 theme JS gallery with a server-rendered [wporg-plugins-screenshots] shortcode in the Plugin Directory plugin, and added the Gallery Lightbox Enhancements polyfill that ports two pending Gutenberg pull requests (lightbox captions #77477 and the masonry block style #77615). The screenshot UX is now server-side, cacheable by Varnish, works with JS disabled, and renders through core/gallery + core/image blocks instead of bespoke theme JS.

The shortcode renders every figure upfront with eager loading, intrinsic width and height attributes, and fetchpriority="high" on the cap-window thumbnails so there is zero layout shift while screenshots decode. Galleries up to nine figures show the full grid; larger ones render a "Show all N screenshots" reveal button that animates max-height on the wrap to full size with a setTimeout fallback so the cap always releases. Layout is deterministic: N=1 single tile, N=2-4 row-aligned grid, N>=5 brick masonry by default with a row-aligned grid upgrade when every screenshot shares an aspect ratio. Aspect ratios and pixel dimensions come from a single Memcached-cached probe over the screenshot URLs (md5-keyed so a revision bump auto-invalidates). Lightbox captions and a generic Masonry block style ship through the polyfill plugin so they self-disable once core lands the upstream PRs.

Removed the legacy theme implementation: client/screenshots/, the dedicated theme.js entry, the build:old:js npm script, and the matching SCSS partials. The theme no longer carries any screenshot-specific JavaScript or stylesheets - the shortcode owns the entire flow.

Affected: wordpress.org/public_html/wp-content/plugins/gallery-lightbox-enhancements/, wordpress.org/public_html/wp-content/plugins/plugin-directory/shortcodes/, wordpress.org/public_html/wp-content/plugins/plugin-directory/class-plugin-directory.php, wordpress.org/public_html/wp-content/themes/pub/wporg-plugins-2024/

Switched the screenshot count placeholder from %d to %s and ran $count
through number_format_i18n() so locales with non-Latin digit grouping
render the value correctly. Keeps the same _n() pluralisation and the
same translator comment, with %s in both.

Addresses dd32's review comment on lines 423-425 (PR WordPress#622).

Replaced the hand-rolled emit_preconnect() that printed <link> tags
straight into wp_head with a wp_resource_hints filter callback. The
filter is the native WordPress integration point for preconnect and
dns-prefetch hints, lets other code dedupe and reorder, and reads more
naturally next to the rest of the plugin-directory hooks.

Hint now runs on every singular plugin page (production or local) —
the previous production-only guard with function_exists fallback was
dropped: the hint is harmless in any environment and we target modern
WP without backcompat shims.

Addresses dd32's review comment on lines 192-193 (PR WordPress#622).

str_contains() requires PHP 8.0+, but the plugin header declares
Requires PHP: 7.4. Switched the lightbox-container detection check to
strpos() so the plugin loads cleanly on the minimum supported PHP
version instead of fatal-erroring on first hook fire.

Three documentation-only cleanups in the screenshots shortcode:

- Removed the COMPACT_VISIBLE constant. It was a leftover from an
  earlier "render only N tiles in the collapsed state" design; the
  current implementation renders every figure into the DOM and clips
  the wrap with CSS max-height, so the constant has no callers.
- Updated the class header docblock to match: it now describes the
  fixed max-height collapse cap instead of the removed per-tile cap.
- Updated the screenshots.css and js/screenshots.js header comments
  the same way: they used to describe a JS measurement that wrote
  --collapse-height inline. The measurement was already gone, only
  the comments lagged behind.
- Documented the new $dimensions parameter on build_gallery_markup().

- Removed fetch_dimensions() and parse_image_dimensions(); width and height now come from the assets_screenshots post meta, populated by Import::enrich_asset_dimensions() in r14866 and inlined onto every screenshot entry by Template::get_screenshots().
- Simplified get_dimensions() to a plain pluck over the screenshot list; dropped the CACHE_GROUP constant and the Memcached verdict cache, both unnecessary now that the lookup is in-process.
- Kept the is_uniform_aspect() partial-fail fallback intact, so a missing dimension pair still degrades to brick masonry without breaking the gallery.

Affected: wordpress.org/public_html/wp-content/plugins/plugin-directory/shortcodes/class-screenshots.php

- Wrapped each <img> in build_image_block() with an <a href="{src}" target="_blank" rel="noopener"> so the no-JS reader still gets a path to the full-resolution screenshot in a new tab.
- Core's lightbox interactivity script attaches its own click handler on hydration and calls preventDefault() before the anchor would navigate, so JS readers keep the existing lightbox flow unchanged.

Affected: wordpress.org/public_html/wp-content/plugins/plugin-directory/shortcodes/class-screenshots.php