fix: add missing email reply validation (#1934)

## Description

General fixes to the email domain features

Changes made:
- Add "email" validation for "Reply-To email" fields
- Fix issue where you can't remove the "Reply-To" email after it's set
- Fix issue where setting the "Sender email" back to Documenso would
still send using the org/team pref

apps/remix/app/routes/_authenticated+/o.$orgUrl.settings.email-domains.$id.tsx

@@ -171,7 +171,7 @@ export default function OrganisationEmailDomainSettingsPage({ params }: Route.Co
         <OrganisationEmailDomainRecordsDialog
           records={records}
           trigger={
-            <Button variant="secondary">
+            <Button variant="outline">
               <Trans>View DNS Records</Trans>
             </Button>
           }