also bind Cmd+Y to redo on macOS

frontend/apps/artcraft/app/src/pages/PageEnigma/Editor/keybinds_controls.ts

@@ -393,8 +393,8 @@ export class MouseControls {
         } finally {
           this.isProcessing = false;
         }
-      } else if (keyLower === "y" && !event.metaKey) {
-        // redo (Ctrl+Y, Windows/Linux)
+      } else if (keyLower === "y") {
+        // redo (Ctrl+Y on Windows/Linux, Cmd+Y on macOS)
         event.preventDefault();
         this.isProcessing = true;
         try {