feat: 增加extra

Author: Roxannej

src/Dialog/Content/index.tsx

@@ -37,12 +37,6 @@ const Content = React.forwardRef<ContentRef, ContentProps>((props, ref) => {
 
   const panelRef = useRef<PanelRef>(null);
 
-  const hasExtra =
-  extra !== null &&
-  extra !== undefined &&
-  typeof extra !== 'boolean' &&
-  !(typeof extra === 'string' && extra.trim() === '');
-
   // ============================== Refs ==============================
   React.useImperativeHandle(ref, () => ({
     ...panelRef.current,