Cache the small image when we get the browser art

We use the RawImageDataProvider here to pass the already downloaded
image onto this transform, to avoid fetching it from MPD again. The
180x180 size artwork is plenty big enough to use as source for the 32x32
queue/dragged song artwork.

Persephone/Components/Browser/Album Browser/AlbumViewItem.swift

@@ -71,7 +71,34 @@ class AlbumViewItem: NSCollectionViewItem {
         .processor(DownsamplingImageProcessor(size: .albumListCoverSize)),
         .scaleFactor(2),
       ]
-    )
+    ) { result in
+      switch result {
+      case .success(let imageResult):
+        guard let imageData = imageResult.image.tiffRepresentation
+          else { return }
+        
+        let rawProvider = RawImageDataProvider(
+          data: imageData,
+          cacheKey: album.hash
+        )
+        
+        self.cacheSmallCover(provider: rawProvider)
+
+      case .failure(_):
+        break
+      }
+    }
+  }
+  
+  func cacheSmallCover(provider: ImageDataProvider) {
+    _ = KingfisherManager.shared.retrieveImage(
+      with: .provider(provider),
+      options: [
+        .memoryCacheExpiration(.never),
+        .processor(DownsamplingImageProcessor(size: .queueSongCoverSize)),
+        .scaleFactor(2),
+      ]
+    ) { result in }
   }
 
   func setAppearance(selected isSelected: Bool) {

Persephone/Components/Browser/Album Detail/AlbumDetailView.swift

@@ -145,19 +145,6 @@ class AlbumDetailView: NSViewController {
         .scaleFactor(2),
       ]
     )
-
-    cacheSmallCover(provider: provider)
-  }
-  
-  func cacheSmallCover(provider: MPDAlbumArtImageDataProvider) {
-    _ = KingfisherManager.shared.retrieveImage(
-      with: .provider(provider),
-      options: [
-        .memoryCacheExpiration(.never),
-        .processor(DownsamplingImageProcessor(size: .queueSongCoverSize)),
-        .scaleFactor(2),
-      ]
-    ) { result in }
   }
 
   func setAppearance() {