fix:should be PathPickerForListView in demo

add:Maybe we can add a command demo here to show how to trigger the bound command.
change:I think these two themes should be merged, and the "AcceptReturn" should just be controlled by "AllowMultiple"
add:One more thing, we should add a property to control what to do when user cancelled a selection. Sometimes I just want to keep the original selection.

demo/Ursa.Demo/ViewModels/PathPickerDemoViewModel.cs

@@ -1,5 +1,6 @@
 using System.Collections.Generic;
 using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
 
 namespace Ursa.Demo.ViewModels;
 
@@ -7,4 +8,11 @@ public partial class PathPickerDemoViewModel : ViewModelBase
 {
     [ObservableProperty] private string? _path;
     [ObservableProperty] private IReadOnlyList<string>? _paths;
+    [ObservableProperty] private int _commandTriggerCount = 0;
+
+    [RelayCommand]
+    private void Selected(IReadOnlyList<string> paths)
+    {
+        CommandTriggerCount++;
+    }
 }