Adding equipment works

Messages/EditEquipmentDone.cs

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+using GazpromApp.ViewModels;
+
+namespace GazpromApp.Messages;
+
+public class EditEquipmentDone(EquipmentViewModel equipment)
+{
+    public EquipmentViewModel Equipment { get; } = equipment;
+}

Messages/EditEquipmentMessage.cs

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+using CommunityToolkit.Mvvm.Messaging.Messages;
+using GazpromApp.ViewModels;
+
+namespace GazpromApp.Messages;
+
+public class EditEquipmentMessage(EquipmentViewModel equipment) : AsyncRequestMessage<EquipmentViewModel?>
+{
+    public EquipmentViewModel Equipment { get; } = equipment;
+}

Messages/NewEquipmentDone.cs

@@ -0,0 +1,8 @@
+using GazpromApp.ViewModels;
+
+namespace GazpromApp.Messages;
+
+public class NewEquipmentDone(EquipmentViewModel equipment)
+{
+    public EquipmentViewModel Equipment { get; } =  equipment;
+}

Messages/NewEquipmentMessage.cs

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+using CommunityToolkit.Mvvm.Messaging.Messages;
+using GazpromApp.ViewModels;
+
+namespace GazpromApp.Messages;
+
+public class NewEquipmentMessage : AsyncRequestMessage<EquipmentViewModel?>;