Enter/Exit folder

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

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+using System.Collections.ObjectModel;
+using FileTime.App.Core.Models.Enums;
+
+namespace FileTime.App.Core.ViewModels
+{
+    public interface IAppState
+    {
+        ObservableCollection<ITabViewModel> Tabs { get; }
+        IObservable<ITabViewModel?> SelectedTab { get; }
+        IObservable<string?> SearchText { get; }
+        ViewMode ViewMode { get; }
+
+        void AddTab(ITabViewModel tabViewModel);
+        void RemoveTab(ITabViewModel tabViewModel);
+        void SetSearchText(string? searchText);
+    }
+}