Fix: Enabled Play action for single media file selection (#18520)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: yair100

src/Files.App/Actions/Content/PlayAllAction.cs

@@ -11,7 +11,9 @@ internal sealed partial class PlayAllAction : ObservableObject, IAction
 		private readonly IContentPageContext context;
 
 		public string Label
-			=> Strings.PlayAll.GetLocalizedResource();
+			=> context.SelectedItems.Count > 1
+				? Strings.PlayAll.GetLocalizedResource()
+				: Strings.Play.GetLocalizedResource();
 
 		public string Description
 			=> Strings.PlayAllDescription.GetLocalizedResource();
@@ -24,7 +26,7 @@ public RichGlyph Glyph
 
 		public bool IsExecutable =>
 			context.PageType != ContentPageTypes.RecycleBin &&
-			context.SelectedItems.Count > 1 &&
+			context.SelectedItems.Count > 0 &&
 			context.SelectedItems.All(item => FileExtensionHelpers.IsMediaFile(item.FileExtension));
 
 		public PlayAllAction()
@@ -46,6 +48,7 @@ private void Context_PropertyChanged(object? sender, PropertyChangedEventArgs e)
 				case nameof(IContentPageContext.PageType):
 				case nameof(IContentPageContext.SelectedItems):
 					OnPropertyChanged(nameof(IsExecutable));
+					OnPropertyChanged(nameof(Label));
 					break;
 			}
 		}

src/Files.App/Strings/en-US/Resources.resw

@@ -2412,6 +2412,9 @@
     <value>Are you sure you want to delete this tag?</value>
   </data>
   <data name="PlayAll" xml:space="preserve">
+    <value>Play All</value>
+  </data>
+  <data name="Play" xml:space="preserve">
     <value>Play</value>
   </data>
   <data name="Height" xml:space="preserve">

src/Files.Shared/Helpers/FileExtensionHelpers.cs

@@ -259,7 +259,8 @@ public static bool IsMediaFile(string? filePathToCheck)
 		{
 			return HasExtension(
 				filePathToCheck, ".mp4", ".m4v", ".mp4v", ".3g2", ".3gp2", ".3gp", ".3gpp",
-				".mpg", ".mp2", ".mpeg", ".mpe", ".mpv", ".mkv", ".ogg", ".avi", ".wmv", ".mov", ".qt");
+				".mpg", ".mp2", ".mpeg", ".mpe", ".mpv", ".mkv", ".ogg", ".avi", ".wmv", ".mov", ".qt",
+				".mp3", ".m4a", ".oga", ".wav", ".wma", ".aac", ".flac");
 		}
 
 		/// <summary>