Practice battles work

SVSim.EmulatedEntrypoint/Controllers/DeckController.cs

@@ -256,13 +256,6 @@ public class DeckController : SVSimController
         return Task.FromResult<ActionResult<EmptyResponse>>(new EmptyResponse());
     }
 
-    private bool TryGetViewerId(out long viewerId)
-    {
-        viewerId = 0;
-        var claim = User.Claims.FirstOrDefault(c => c.Type == ShadowverseClaimTypes.ViewerIdClaim)?.Value;
-        return claim is not null && long.TryParse(claim, out viewerId);
-    }
-
     /// <summary>
     /// Convert a flat `card_id_array` (cards repeated for count) into a grouped DeckCard list.
     /// Cards not in the DB are silently dropped — until CardImport lands the result is always