add ui

ui/pages/problem_settings.page.js

@@ -0,0 +1,19 @@
+import { NamedPage } from 'vj/misc/PageLoader';
+
+async function handleCategoryClick(ev) {
+  const $target = $(ev.currentTarget);
+  const $txt = $('[name="category"]');
+  console.log($target);
+  console.log($txt);
+  $txt.val(`${$txt.val()}, ${$target.data('category')}`);
+}
+
+const page = new NamedPage('problem_settings', async () => {
+  $(document).on('click', '.category-a', handleCategoryClick);
+  $(document).on('click', '[name="problem-sidebar__show-category"]', (ev) => {
+    $(ev.currentTarget).hide();
+    $('[name="problem-sidebar__categories"]').show();
+  });
+});
+
+export default page;