🐛(front) improve domain "return" button

The button to return to domain list was reloading the whole page which
was quite long (and somehow failing on staging).

src/frontend/apps/desk/src/features/mail-domains/domains/__tests__/MailDomainView.test.tsx

@@ -57,6 +57,11 @@ jest.mock('@openfun/cunningham-react', () => ({
   }),
 }));
 
+jest.mock('next/navigation', () => ({
+  ...jest.requireActual('next/navigation'),
+  useRouter: () => jest.fn(),
+}));
+
 describe('<MailDomainView />', () => {
   const apiUrl = `end:/mail-domains/${mockMailDomain.slug}/fetch/`;
 

src/frontend/apps/desk/src/features/mail-domains/domains/components/MailDomainView.tsx

@@ -1,4 +1,5 @@
 import { Button } from '@openfun/cunningham-react';
+import { useRouter } from 'next/navigation';
 import * as React from 'react';
 import { useTranslation } from 'react-i18next';
 
@@ -26,6 +27,7 @@ export const MailDomainView = ({
 }: Props) => {
   const { t } = useTranslation();
   const { colorsTokens } = useCunninghamTheme();
+  const router = useRouter();
   const [showModal, setShowModal] = React.useState(false);
 
   const handleShowModal = () => {
@@ -53,7 +55,7 @@ export const MailDomainView = ({
         >
           <Box $direction="row" $align="center" $gap="8px">
             <Button
-              href="/mail-domains"
+              onClick={() => router.push('/mail-domains/')}
               icon={<span className="material-icons">arrow_back</span>}
               iconPosition="left"
               color="secondary"