fix: add line-clamp property for media viewer text overflow

Author: Sunwuyuan

src/components/posts/PostCard.vue

@@ -1594,6 +1594,7 @@ const openMediaViewer = (index) => {
   line-height: 1.4;
   display: -webkit-box;
   -webkit-line-clamp: 3;
+  line-clamp: 3;
   -webkit-box-orient: vertical;
   overflow: hidden;
 }