✨(download) add raw email download button

src/frontend/public/locales/common/en-US.json

@@ -99,6 +99,7 @@
   "Domain admin": "Domain admin",
   "Domain not found": "Domain not found",
   "Download": "Download",
+  "Download raw email": "Download raw email",
   "Draft": "Draft",
   "Draft deleted": "Draft deleted",
   "Draft saved": "Draft saved",

src/frontend/public/locales/common/fr-FR.json

@@ -99,6 +99,7 @@
   "Domain admin": "Gestion des domaines",
   "Domain not found": "Domaine introuvable",
   "Download": "Télécharger",
+  "Download raw email": "Télécharger l'email brut",
   "Draft": "Brouillon",
   "Draft deleted": "Brouillon supprimé",
   "Draft saved": "Brouillon enregistré",

src/frontend/src/features/layouts/components/thread-view/components/thread-message/index.tsx

@@ -15,6 +15,8 @@ import { MessageFormMode } from "@/features/forms/components/message-form";
 import MailHelper from "@/features/utils/mail-helper";
 import useAbility, { Abilities } from "@/hooks/use-ability";
 import { ContactChip } from "@/features/ui/components/contact-chip";
+import { getMessagesEmlRetrieveUrl } from "@/features/api/gen/messages/messages";
+import { getRequestUrl } from "@/features/api/utils";
 
 type ThreadMessageProps = {
     message: Message,
@@ -158,6 +160,19 @@ export const ThreadMessage = forwardRef<HTMLElement, ThreadMessageProps>(
                                             icon: <span className="material-icons">mark_email_unread</span>,
                                             callback: () => markAsUnreadFrom(message.id)
                                         },
+                                        {
+                                            label: t('Download raw email'),
+                                            icon: <span className="material-icons">download</span>,
+                                            callback: () => {
+                                                const downloadUrl = getRequestUrl(getMessagesEmlRetrieveUrl(message.id));
+                                                const link = document.createElement('a');
+                                                link.href = downloadUrl;
+                                                link.download = `message-${message.id}.eml`;
+                                                document.body.appendChild(link);
+                                                link.click();
+                                                document.body.removeChild(link);
+                                            }
+                                        },
                                         ...(message.is_trashed ? [] : [{
                                             label: t('Delete'),
                                             icon: <span className="material-icons">delete</span>,