RapidTravel impr, GoBack/Forward, header navigation

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

@@ -0,0 +1,15 @@
+namespace FileTime.App.Core.UserCommand;
+
+public class GoBackCommand : IIdentifiableUserCommand
+{
+    public const string CommandName = "go_back";
+
+    public static GoBackCommand Instance { get; } = new();
+
+    private GoBackCommand()
+    {
+    }
+
+    public string UserCommandID => CommandName;
+    public string Title => "Go back";
+}

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

@@ -0,0 +1,15 @@
+namespace FileTime.App.Core.UserCommand;
+
+public class GoForwardCommand : IIdentifiableUserCommand
+{
+    public const string CommandName = "go_forward";
+
+    public static GoForwardCommand Instance { get; } = new();
+
+    private GoForwardCommand()
+    {
+    }
+
+    public string UserCommandID => CommandName;
+    public string Title => "Go forward";
+}

src/AppCommon/FileTime.App.Core.Abstraction/ViewModels/IAppState.cs

@@ -12,6 +12,7 @@ public interface IAppState
     IObservable<string?> SearchText { get; }
     IDeclarativeProperty<ViewMode> ViewMode { get; }
     DeclarativeProperty<string?> RapidTravelText { get; }
+    IDeclarativeProperty<string?> RapidTravelTextDebounced { get; }
     ITimelineViewModel TimelineViewModel { get; }
     IDeclarativeProperty<string?> ContainerStatus { get; }