Frequency navigation WIP

src/AppCommon/FileTime.App.Core.Abstraction/Services/IModalService.cs

@@ -9,4 +9,5 @@ public interface IModalService
 
     void OpenModal(IModalViewModel modalToOpen);
     void CloseModal(IModalViewModel modalToClose);
+    T OpenModal<T>() where T : IModalViewModel;
 }

src/AppCommon/FileTime.App.Core.Abstraction/UserCommand/GoByFrequencyCommand.cs

@@ -0,0 +1,14 @@
+namespace FileTime.App.Core.UserCommand;
+
+public class GoByFrequencyCommand : IIdentifiableUserCommand
+{
+    public const string CommandName = "go_by_frequency";
+    
+    public static GoByFrequencyCommand Instance { get; } = new();
+    
+    private GoByFrequencyCommand()
+    {
+    }
+
+    public string UserCommandID => CommandName;
+}