Add subtitle for shell command

Author: Yu Leng (from Dev Box)

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Bookmark/Command/ShellCommand.cs

@@ -24,7 +24,7 @@ public sealed partial class ShellCommand : InvokableCommand
 
     private string BookmarkName { get; }
 
-    private string BookmarkValue { get; }
+    public string BookmarkValue { get; }
 
     public ShellCommand(BookmarkData data)
         : this(data.Name, data.Bookmark, data.Type)

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.Bookmark/Helpers/CommandItemFactory.cs

@@ -9,6 +9,7 @@
 using Microsoft.CmdPal.Ext.Bookmarks.Properties;
 using Microsoft.CmdPal.Ext.Indexer;
 using Microsoft.CommandPalette.Extensions.Toolkit;
+using Microsoft.Diagnostics.Utilities;
 using Windows.Foundation;
 
 namespace Microsoft.CmdPal.Ext.Bookmarks.Helpers;
@@ -114,6 +115,8 @@ private static CommandItem CreateShellCommand(BookmarkData bookmark, TypedEventH
 
         List<CommandContextItem> contextMenu = [];
 
+        listItem.Subtitle = invokableCommand.BookmarkValue;
+
         var edit = new AddBookmarkPage(bookmark) { Icon = IconHelper.EditIcon };
         edit.AddedCommand += addBookmarkFunc;
         contextMenu.Add(new CommandContextItem(edit));