fix: prevent menu closure when switching language in user dropdown

Set comboboxProps={{ withinPortal: false }} on the language Select
inside Menu.Dropdown so its option list renders inside the Menu's DOM
tree rather than a portal. This prevents the Menu from treating option
clicks as outside interactions and closing before changeLanguage fires.

apps/web/src/apps/auth/login/index.tsx

@@ -87,7 +87,6 @@ export default function LoginPage() {
               size="xs"
               variant="unstyled"
               w={90}
-              comboboxProps={{ withinPortal: false }}
               data={[
                 { value: 'en', label: t('common:english') },
                 { value: 'id', label: t('common:indonesian') },