# Preview-page thumbnail grid (task wn0). The album preview page (page-N.html)
# used to render EACH thumbnail with its own "template preview" call, paying the
# full source_template_file cost (an "env -i bash" invocation) per thumbnail.
# render_full_preview_page now pre-builds the markup for ALL of a page's
# thumbnails in bash (render_preview_thumbnail / build into one string) and hands
# the whole grid in through the raw context field render_preview_thumbs_html, so
# this template emits every thumbnail for the page in ONE render call instead of
# N. The per-thumbnail markup is byte-identical to the old preview.tmpl output
# (same <a name=... href=...><img class='thumb <anim>' .../></a> structure, order
# and seeded animation classes). The surrounding header/footer still come from
# their own templates, which render_full_preview_page emits around this one.
cat <<END
<div class="thumbs-grid">
${render_preview_thumbs_html}
</div>
END