fix: loading state from open url

fix: some animation export error

Pixiview/Illust/ViewIllustPage.xaml.cs

@@ -317,7 +317,8 @@ namespace Pixiview.Illust
                 {
                     tmp[i] = new IllustDetailItem
                     {
-                        Id = illustItem.Id
+                        Id = illustItem.Id,
+                        Loading = true
                     };
                 }
                 Illusts = items = tmp;