Fix cover not displaying for NcAlbum if the file is shared

app/lib/api/api_util.dart

@@ -81,6 +81,16 @@ String getFilePreviewUrlByFileId(
   return url;
 }
 
+/// Return the preview image URL for [fileId], using the new Photos API in
+/// Nextcloud 25
+String getPhotosApiFilePreviewUrlByFileId(
+  Account account,
+  int fileId, {
+  required int width,
+  required int height,
+}) =>
+    "${account.url}/apps/photos/api/v1/preview/$fileId?x=$width&y=$height";
+
 String getFileUrl(Account account, FileDescriptor file) {
   return "${account.url}/${getFileUrlRelative(file)}";
 }

app/lib/entity/collection/content_provider/nc_album.dart

@@ -64,12 +64,11 @@ class CollectionNcAlbumProvider
     if (album.lastPhoto == null) {
       return null;
     } else {
-      return api_util.getFilePreviewUrlByFileId(
+      return api_util.getPhotosApiFilePreviewUrlByFileId(
         account,
         album.lastPhoto!,
         width: width,
         height: height,
-        isKeepAspectRatio: isKeepAspectRatio ?? false,
       );
     }
   }