Fix media lightbox and sleep target

assets/js/app.js

@@ -1658,6 +1658,10 @@
             return;
         }
 
+        if (lightbox.parentElement !== document.body) {
+            document.body.appendChild(lightbox);
+        }
+
         const close = () => {
             lightbox.setAttribute("hidden", "hidden");
             content.replaceChildren();