fix(post form): block temporary media links

src/components/post-form/post-form.module.css

@@ -188,6 +188,11 @@
   color: red;
 }
 
+.formError {
+  margin: 8px 0;
+  padding: 6px 5px;
+}
+
 .status {
   padding: 5px;
 }