refactor layout

* ui polishing
* frontend and backend fixes

apps/client/src/components/settings/settings-title.tsx

@@ -0,0 +1,13 @@
+import React from 'react';
+import { Divider, Title } from '@mantine/core';
+
+export default function SettingsTitle({ title }: { title: string }) {
+  return (
+    <>
+      <Title order={3}>
+        {title}
+      </Title>
+      <Divider my="md" />
+    </>
+  );
+}