Stop polling the library catalog and keep the stage on thumbs.

Co-authored-by: Cursor <cursoragent@cursor.com>

assets/css/display.css

@@ -347,7 +347,8 @@
 
 /* Grow until width or height hits the stage; letterbox/pillarbox via contain */
 .viewer-frame > img,
-.viewer-frame > video {
+.viewer-frame > video,
+.viewer-still {
   width: 100%;
   height: 100%;
   max-width: 100%;
@@ -356,6 +357,18 @@
   object-position: center;
 }
 
+.viewer-still--veiled {
+  opacity: 0;
+  pointer-events: none;
+}
+
+.viewer-frame--veiled .viewer-veil-label {
+  position: absolute;
+  z-index: 2;
+  margin: 0;
+  pointer-events: none;
+}
+
 /* Top chrome is a sibling of the media pane — never absolute over pixels */
 .stage-chrome {
   display: flex;