feat(ui): add silent option to transformer.startTransform

A "silent" transformation executes without any user feedback.

invokeai/frontend/web/src/features/controlLayers/components/Transform/Transform.tsx

@@ -25,6 +25,7 @@ const TransformContent = memo(({ adapter }: { adapter: CanvasEntityAdapter }) =>
   const onChangeIsolatedPreview = useCallback(() => {
     dispatch(settingsIsolatedTransformingPreviewToggled());
   }, [dispatch]);
+  const silentTransform = useStore(adapter.transformer.$silentTransform);
 
   useRegisteredHotkeys({
     id: 'applyTransform',
@@ -42,6 +43,10 @@ const TransformContent = memo(({ adapter }: { adapter: CanvasEntityAdapter }) =>
     dependencies: [adapter.transformer, isProcessing, isCanvasFocused],
   });
 
+  if (silentTransform) {
+    return null;
+  }
+
   return (
     <Flex
       ref={ref}