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

Jellyfin.Plugin.Seasonals/Web/space.js

@@ -252,7 +252,8 @@ function createSpace() {
             // Swap to a random image from the pool every time it completes an orbit (disappears)
             if (imageArr.length > 1) {
                 // The animation delay pushes the initial cycle, so we use setInterval matched to duration
-                setInterval(() => {
+                const intervalId = setInterval(() => {
+                    if (!document.body.contains(container)) { clearInterval(intervalId); return; }
                     // Update only if currently out of bounds to avoid popping
                     const rect = symbol.getBoundingClientRect();
                     if (rect.right < 0 || rect.left > window.innerWidth) {