refactor: rename preloadManager to imageManager (#25436)

rename: preloadManager to imageManager

web/src/lib/managers/ImageManager.svelte.ts

@@ -0,0 +1,43 @@
+import { getAssetMediaUrl } from '$lib/utils';
+import { cancelImageUrl } from '$lib/utils/sw-messaging';
+import { AssetMediaSize, type AssetResponseDto } from '@immich/sdk';
+
+type AllAssetMediaSize = AssetMediaSize | 'all';
+
+class ImageManager {
+  preload(asset: AssetResponseDto | undefined, size: AssetMediaSize = AssetMediaSize.Preview) {
+    if (!asset) {
+      return;
+    }
+
+    const url = getAssetMediaUrl({ id: asset.id, size, cacheKey: asset.thumbhash });
+    if (!url) {
+      return;
+    }
+
+    const img = new Image();
+    img.src = url;
+  }
+
+  cancel(asset: AssetResponseDto | undefined, size: AllAssetMediaSize = AssetMediaSize.Preview) {
+    if (!asset) {
+      return;
+    }
+
+    const sizes = size === 'all' ? Object.values(AssetMediaSize) : [size];
+    for (const size of sizes) {
+      const url = getAssetMediaUrl({ id: asset.id, size, cacheKey: asset.thumbhash });
+      if (url) {
+        cancelImageUrl(url);
+      }
+    }
+  }
+
+  cancelPreloadUrl(url: string | undefined) {
+    if (url) {
+      cancelImageUrl(url);
+    }
+  }
+}
+
+export const imageManager = new ImageManager();