feat: improve asset-viewer next/prev perf and standardize preloading behavior (#24422)

Co-authored-by: Alex <alex.tran1502@gmail.com>

web/src/lib/utils/sw-messaging.ts

@@ -1,8 +1,14 @@
 const broadcast = new BroadcastChannel('immich');
 
-export function cancelImageUrl(url: string) {
+export function cancelImageUrl(url: string | undefined | null) {
+  if (!url) {
+    return;
+  }
   broadcast.postMessage({ type: 'cancel', url });
 }
-export function preloadImageUrl(url: string) {
+export function preloadImageUrl(url: string | undefined | null) {
+  if (!url) {
+    return;
+  }
   broadcast.postMessage({ type: 'preload', url });
 }