Add chapter images: thumbnail on the list, headline image on the detail page

_chapter.html.erb (the aggregator partial used by the erfas/
chaostreffs overview pages) never rendered an image at all --
editors attaching a hackerspace photo via the asset picker would see
zero visible effect on exactly the pages they'd check first.
chapter_detail.html.erb (the individual page template) had the same
gap. Both fixed by reusing existing infrastructure rather than
inventing anything: the overview list gets a small, aspect-preserving
:thumb image beside the heading; the detail page gets the app's
existing headline_image helper, the same one every other full-page
template already uses.

1 files changed, 17 insertions, 0 deletions

diff --git a/public/stylesheets/ccc.css b/public/stylesheets/ccc.css
index fe2144fd..bb4f7e3b 100644
--- a/public/stylesheets/ccc.css
+++ b/public/stylesheets/ccc.css
@@ -610,3 +610,20 @@ label[for=light-mode] {
   }
 }
 
+.chapter_partial_layout {
+  display: flex;
+  gap: 12px;
+  align-items: flex-start;
+}
+
+.chapter_thumbnail img {
+  width: 64px;
+  height: 64px;
+  object-fit: cover;
+  border-radius: 4px;
+  display: block;
+}
+
+.chapter_partial_content {
+  min-width: 0;
+}