support post preview video

Author: James-Kua

src/components/Post.tsx

@@ -112,6 +112,8 @@ const PostComponent = ({ post }: { post: Post }) => {
               </a>
             </p>
           </div>
+        ) : post.preview?.reddit_video_preview ? (
+          <PostPreview preview={post.preview} />
         ) : post.secure_media_embed?.media_domain_url ? (
           <SecureMediaEmbed
             url_overridden_by_dest={post.url_overridden_by_dest}