fix(submit): keep sidebar visible on front submit page

assets/css/frontend/pages/submit.css

@@ -1,4 +1,9 @@
 /* Front-end article editor — follows the reference theme's newposts page. */
+/* The form wraps both float columns; flow-root keeps it from collapsing. */
+#aksrt-submit-form {
+  display: flow-root;
+}
+
 #aksrt-submit-form .zib-widget {
   margin-bottom: 15px;
   padding: 15px;