mark posts as read when opening

lib/widgets/homepage_post.dart

@@ -32,11 +32,18 @@ class _HomepagePostState extends State<HomepagePost> {
             : Theme.of(context).colorScheme.secondaryContainer.withAlpha(150),
       ),
       child: InkWell(
-          onTap: () {
+          onTap: () async {
             Navigator.of(context).push(
               MaterialPageRoute(
                   builder: (context) => ArticlePage(article: post)),
             );
+            if (!post.isRead) {
+              await post.api
+                  .request()
+                  .markItem(post, ItemMarkType.read)
+                  .execute();
+              setState(() {});
+            }
           },
           onLongPress: () async {
             var theme = Theme.of(context);