also remove video from the dom

frontend/js/videos.js

@@ -814,7 +814,19 @@ App.videos = App.videos || {};
             if (el) { el.innerHTML = ''; el.style.height = '0px'; }
         };
 
-        return { ensureInit, packFrom, update: scheduleUpdate, relayout, reset };
+        // Removes a single video's card from the grid: its DOM element is
+        // unmounted directly (so it's gone even if the re-pack below can't run),
+        // then the remaining cards are re-packed against the now-shorter queue.
+        // The caller must have already removed the video from state.loadedVideos.
+        const removeVideo = function(videoId) {
+            const id = String(videoId);
+            mounted.forEach((card, i) => {
+                if (card.dataset.videoId === id) unmount(i);
+            });
+            relayout();
+        };
+
+        return { ensureInit, packFrom, update: scheduleUpdate, relayout, removeVideo, reset };
     })();
 
     App.videos.updateLoadMoreState = function() {