fix cloud gacha download crash

src/Snap.Hutao/Snap.Hutao/Extension/EnumerableExtension.Collection.cs

@@ -10,6 +10,20 @@ namespace Snap.Hutao.Extension;
 /// </summary>
 internal static partial class EnumerableExtension
 {
+    /// <summary>
+    /// 尝试添加物品
+    /// </summary>
+    /// <typeparam name="T">物品类型</typeparam>
+    /// <param name="collection">集合</param>
+    /// <param name="item">物品</param>
+    public static void AddIfNotContains<T>(this Collection<T> collection, T item)
+    {
+        if (!collection.Contains(item))
+        {
+            collection.Add(item);
+        }
+    }
+
     /// <summary>
     /// 移除集合中满足条件的项
     /// </summary>

src/Snap.Hutao/Snap.Hutao/Service/GachaLog/GachaLogService.cs

@@ -311,7 +311,7 @@ internal sealed class GachaLogService : IGachaLogService
     {
         if (archive == null)
         {
-            archive = appDbContext.GachaArchives.SingleOrDefault(a => a.Uid == uid);
+            archive = appDbContext.GachaArchives.AsNoTracking().SingleOrDefault(a => a.Uid == uid);
 
             if (archive == null)
             {
@@ -320,7 +320,7 @@ internal sealed class GachaLogService : IGachaLogService
 
                 // System.InvalidOperationException: Sequence contains no elements
                 // ? how this happen here?
-                archive = appDbContext.GachaArchives.Single(a => a.Uid == uid);
+                archive = appDbContext.GachaArchives.AsNoTracking().Single(a => a.Uid == uid);
                 GachaArchive temp = archive;
                 ThreadHelper.InvokeOnMainThread(() => archiveCollection!.Add(temp));
             }

src/Snap.Hutao/Snap.Hutao/ViewModel/GachaLog/GachaLogViewModel.cs

@@ -321,6 +321,7 @@ internal sealed class GachaLogViewModel : Abstraction.ViewModel
             if (isOk)
             {
                 await ThreadHelper.SwitchToMainThreadAsync();
+                Archives?.AddIfNotContains(archive!);
                 SetSelectedArchiveAndUpdateStatistics(archive, true);
             }
         }