Revert "chore: rm unnecessary placeholder div"

This reverts commit 7e74dbf.

Author: wackerow

src/components/PostsSwiper/index.tsx

@@ -34,6 +34,7 @@ const PostsSwiper = ({ className, items }: PostsSwiperProps) => (
       ))}
 
       <MdChevronLeft className="swiper-button-prev" />
+      <div className="swiper-pagination" />
       <MdChevronRight className="swiper-button-next" />
     </Swiper>
   </div>

src/components/SwiperCards/index.tsx

@@ -50,6 +50,7 @@ const SwiperCards = ({ className }: ClassNameProp) => {
         ))}
 
         <MdChevronLeft className="swiper-button-prev" />
+        <div className="swiper-pagination" />
         <MdChevronRight className="swiper-button-next" />
       </Swiper>
     </div>