Add checks for container presence in animation functions to prevent errors when elements are removed from the DOM [skip ci]

Jellyfin.Plugin.Seasonals/Web/oscar.js

@@ -56,9 +56,9 @@ function createOscar(container) {
     container.appendChild(carpet);
     container.appendChild(spotlights);
     
-    // Paparazzi flashes with randomized intervals
     function flashLoop() {
-        if (!document.querySelector('.oscar-container')) {
+        if (!document.body.contains(container)) return; // Kill the loop if container is removed
+        if (container.style.display === 'none') {
             setTimeout(flashLoop, 1000); // Check again later if hidden
             return;
         }