🐛(frontend) fix mail domain creation form

- allow to submit form by pressing "Enter" key
- force focus on form when form is submited
but is invalid
- add error 500 handling
- update related e2e tests

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

@@ -2,10 +2,16 @@ import { zodResolver } from '@hookform/resolvers/zod';
 import { Button, Input, Loader, ModalSize } from '@openfun/cunningham-react';
 import { useRouter } from 'next/navigation';
 import React from 'react';
-import { Controller, FormProvider, useForm } from 'react-hook-form';
+import {
+  Controller,
+  FormProvider,
+  UseFormReturn,
+  useForm,
+} from 'react-hook-form';
 import { useTranslation } from 'react-i18next';
 import { z } from 'zod';
 
+import { APIError } from '@/api';
 import { Box, Text, TextErrors } from '@/components';
 import { Modal } from '@/components/Modal';
 import { useCreateMailDomain } from '@/features/mail-domains';
@@ -14,7 +20,68 @@ import { default as MailDomainsLogo } from '../assets/mail-domains-logo.svg';
 
 const FORM_ID = 'form-add-mail-domain';
 
-export const ModalCreateMailDomain = () => {
+const useAddMailDomainApiError = ({
+  error,
+  methods,
+}: {
+  error: APIError | null;
+  methods: UseFormReturn<{ name: string }> | null;
+}): string[] | undefined => {
+  const [errorCauses, setErrorCauses] = React.useState<undefined | string[]>(
+    undefined,
+  );
+  const { t } = useTranslation();
+
+  React.useEffect(() => {
+    if (methods && t && error) {
+      let causes = undefined;
+
+      if (error.cause?.length) {
+        const parseCauses = (causes: string[]) =>
+          causes.reduce((arrayCauses, cause) => {
+            switch (cause) {
+              case 'Mail domain with this name already exists.':
+              case 'Mail domain with this Slug already exists.':
+                methods.setError('name', {
+                  type: 'manual',
+                  message: t(
+                    'This mail domain is already used. Please, choose another one.',
+                  ),
+                });
+                break;
+              default:
+                arrayCauses.push(cause);
+            }
+
+            return arrayCauses;
+          }, [] as string[]);
+
+        causes = parseCauses(error.cause);
+      }
+
+      if (error.status === 500 || !error.cause) {
+        causes = [
+          t(
+            'Your request cannot be processed because the server is experiencing an error. If the problem ' +
+              'persists, please contact our support to resolve the issue: suiteterritoriale@anct.gouv.fr.',
+          ),
+        ];
+      }
+
+      setErrorCauses(causes);
+    }
+  }, [methods, t, error]);
+
+  React.useEffect(() => {
+    if (errorCauses && methods) {
+      methods.setFocus('name');
+    }
+  }, [methods, errorCauses]);
+
+  return errorCauses;
+};
+
+export const ModalAddMailDomain = () => {
   const { t } = useTranslation();
   const router = useRouter();
 
@@ -42,28 +109,16 @@ export const ModalCreateMailDomain = () => {
     },
   });
 
-  const onSubmitCallback = () => {
-    void methods.handleSubmit(({ name }, event) => {
-      event?.preventDefault();
+  const errorCauses = useAddMailDomainApiError({ error, methods });
+
+  const onSubmitCallback = (event: React.FormEvent) => {
+    event.preventDefault();
+
+    void methods.handleSubmit(({ name }) => {
       void createMailDomain(name);
     })();
   };
 
-  const causes = error?.cause?.filter((cause) => {
-    const isFound = cause === 'Mail domain with this name already exists.';
-
-    if (isFound) {
-      methods.setError('name', {
-        type: 'manual',
-        message: t(
-          'This mail domain is already used. Please, choose another one.',
-        ),
-      });
-    }
-
-    return !isFound;
-  });
-
   if (!methods) {
     return null;
   }
@@ -82,7 +137,8 @@ export const ModalCreateMailDomain = () => {
       onClose={() => router.push('/mail-domains/')}
       rightActions={
         <Button
-          onClick={onSubmitCallback}
+          type="submit"
+          form={FORM_ID}
           disabled={!methods.watch('name') || isPending}
         >
           {t('Add the domain')}
@@ -98,8 +154,16 @@ export const ModalCreateMailDomain = () => {
         </>
       }
     >
+      {!!errorCauses?.length ? (
+        <TextErrors
+          $margin={{ bottom: 'small' }}
+          $textAlign="left"
+          causes={errorCauses}
+        />
+      ) : null}
+
       <FormProvider {...methods}>
-        <form action="" id={FORM_ID}>
+        <form id={FORM_ID} onSubmit={onSubmitCallback}>
           <Controller
             control={methods.control}
             name="name"
@@ -123,7 +187,6 @@ export const ModalCreateMailDomain = () => {
             )}
           />
         </form>
-        {!!causes?.length ? <TextErrors causes={causes} /> : null}
 
         {isPending && (
           <Box $align="center">