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GLightbox's own selector-based description feature never actually
resolved a selector in three different attempts -- literal text,
then a resolved-but-empty div, then apparently not firing at all
against the installed (unversioned) build. Replaced with a small
afterSlideLoad handler that reads a plain data-credit-selector
attribute and copies the real element's HTML into the slide's
description area directly, depending only on GLightbox handing back
a real DOM node per slide -- a much smaller contract than trusting
its own caption-resolution feature.
Renamed the credit div's class from glightbox-desc, since that name
is reserved by the library's own bundled CSS (display: none
!important) and can't be reliably overridden from here.
Also: distinguishes the credit line and the "N Bilder" caption from
ordinary body text (italic, muted, matching .author_and_date's
existing convention), and makes the lightbox's caption card follow
the site's light/dark toggle via Canvas/CanvasText, since the
library's bundled theme never adapts to it on its own.
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- related_assets gains a `headline` boolean (DB-enforced: at most one
per page), replacing "first image by position" as the headline
rule. A rake task backfills the current first image on every live
head/draft, so nothing changes visually until an editor changes it.
- The image picker sidebar gets a star toggle reflecting the flag;
the TinyMCE inline-image picker's badge now reads it too, instead
of assuming position 0.
- No headline chosen (or none attached) now falls back to the
gallery-count caption itself becoming the lightbox trigger, instead
of the gallery being unreachable.
- Assets gain creator, source_url, and license_key (against a new
config/asset_licenses.yml dictionary). asset_credit renders a
degrading attribution line, reused as a hidden per-image glightbox
caption so credit is one click away for every image, not only the
headline's always-visible one.
- Fixed: asset thumbnails rendered unconditionally regardless of
whether a real variant exists on disk. Asset#has_variant? checks
file existence, not content type -- some legacy PDFs have real
pre-rewrite thumbnails a content-type check would have hidden.
- assets#new/edit rebuilt onto the same node_description/node_content
layout as assets#show, picking up the three new fields in the
process.
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