message: Header: simplify HeaderContent
diff: @@ -50,11 +50,10 @@ const HeaderContent: FC<HeaderContentProps> = ({ platform, mode, ...restProps })
  switch (mode) {
  case 'primary':
  + case 'tertiary':
  return <Headline weight="medium" {...restProps} />;
  case 'secondary':
  return <Caption level="1" weight="medium" caps {...restProps} />;
  - case 'tertiary':
  - return <Headline weight="medium" {...restProps} />;
  }
  };
  