inventory snapshot addition

src/Poe2Trade.Inventory/IInventoryManager.cs

@@ -1,4 +1,5 @@
 using Poe2Trade.Core;
+using Poe2Trade.Screen;
 
 namespace Poe2Trade.Inventory;
 
@@ -11,6 +12,7 @@ public interface IInventoryManager
     string SellerAccount { get; }
     void SetLocation(bool atHome, string? seller = null);
     Task ScanInventory(PostAction defaultAction = PostAction.Stash);
+    Task<ScanResult> SnapshotInventory();
     Task ClearToStash();
     Task<bool> EnsureAtOwnHideout();
     Task ProcessInventory();