fix(admin): expose view/download counters in the admin photos list (#895 follow-up) (#914)

* fix(admin): expose view/download counters in the admin photos list (#895 follow-up)

st-ivan's re-test after #904: statistics panel and event summary now
agree, but the per-image Engagement column still shows 0. Root cause:
the admin photos LIST endpoint maps rows to an explicit response object
that includes like/comment/rating/favorite counts but never included
view_count or download_count — the grid reads photo.view_count ?? 0,
so the column showed 0 regardless of what the DB counted. This mapper,
not stale data, is also why per-image downloads always displayed 0 in
the original report.

Suite extended with a list-endpoint assertion (beacon + download, then
the admin list reflects 1/1 and untouched photos 0/0). The skip test now
neutralizes the route's background pre-zip build, whose async ENOENT
against the intentionally missing file could land mid-suite.

* test: widen the fire-and-forget settle window (#895 follow-up)

The 100ms settle was marginal on loaded CI runners — the counter
increments are deliberately fire-and-forget, and the 909 PRs flaked on
exactly these assertions. 400ms keeps the suite fast while giving slow
runners room.

---------

Co-authored-by: Paul Nothaft <[email protected]>

backend/src/routes/adminPhotos.js

@@ -1091,7 +1091,13 @@ router.get('/:eventId/photos', adminAuth, requirePermission('photos.view'), requ
         average_rating: photo.average_rating || 0,
         comment_count: commentMap[photo.id] || 0,
         like_count: photo.like_count || 0,
-        favorite_count: photo.favorite_count || 0
+        favorite_count: photo.favorite_count || 0,
+        // Engagement counters (#895 follow-up): the grid reads these, but
+        // this explicit mapper never included them — so the Engagement
+        // column showed 0 regardless of what the DB counted. This, not
+        // stale data, was why per-image downloads always displayed 0.
+        view_count: photo.view_count || 0,
+        download_count: photo.download_count || 0
       }))
     });
   } catch (error) {