Focus next/previous input element with Tab

src/ConsoleApp/FileTime.ConsoleUI.App/ConsoleAppState.cs

@@ -1,4 +1,5 @@
-using FileTime.App.Core.ViewModels;
+using System.Collections.ObjectModel;
+using FileTime.App.Core.ViewModels;
 using PropertyChanged.SourceGenerator;
 
 namespace FileTime.ConsoleUI.App;
@@ -6,4 +7,6 @@ namespace FileTime.ConsoleUI.App;
 public partial class ConsoleAppState : AppStateBase, IConsoleAppState
 {
     [Notify] private string? _errorText;
+    //TODO: make it thread safe
+    public ObservableCollection<string> PopupTexts { get; } = new();
 }