Import email attachments to app

Adds MIME metadata to demo email attachments and wires the inbox download action to fetch the attachment blob and import it via useFileHandler. This lets users add PDF and document files directly from email messages into the editor workflow.

frontend/editor/src/core/pages/EmailInboxPage.tsx

@@ -17,6 +17,8 @@ import { useNavigate, useSearchParams } from "react-router-dom";
 import { Button } from "@app/ui/Button";
 import { ActionIcon } from "@app/ui/ActionIcon";
 import apiClient from "@app/services/apiClient";
+import { useFileHandler } from "@app/hooks/useFileHandler";
+import { useAllFiles } from "@app/contexts/file/fileHooks";
 import "@app/pages/EmailInboxPage.css";
 
 type Provider = "Microsoft 365" | "Gmail";
@@ -25,6 +27,7 @@ interface MailAttachment {
   id: string;
   name: string;
   type: string;
+  mimeType: string;
   size: string;
 }
 
@@ -62,6 +65,7 @@ const DEMO_MESSAGES: MailMessage[] = [
         id: "invoice-pdf",
         name: "Rechnung_2026-0814.pdf",
         type: "PDF",
+        mimeType: "application/pdf",
         size: "248 KB",
       },
     ],
@@ -80,9 +84,16 @@ const DEMO_MESSAGES: MailMessage[] = [
         id: "contract-pdf",
         name: "Vertragsunterlagen.pdf",
         type: "PDF",
+        mimeType: "application/pdf",
         size: "1,8 MB",
       },
-      { id: "terms-docx", name: "Anlage_A.docx", type: "DOCX", size: "74 KB" },
+      {
+        id: "terms-docx",
+        name: "Anlage_A.docx",
+        type: "DOCX",
+        mimeType: "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+        size: "74 KB",
+      },
     ],
   },
   {
@@ -105,6 +116,8 @@ const DEMO_ACCOUNT = {
 export default function EmailInboxPage() {
   const { t } = useTranslation();
   const navigate = useNavigate();
+  const { addFiles } = useFileHandler();
+  const { fileStubs } = useAllFiles();
   const [searchParams, setSearchParams] = useSearchParams();
   const [accountConnected, setAccountConnected] = useState(
     searchParams.get("gmail") === "connected",
@@ -190,6 +203,7 @@ export default function EmailInboxPage() {
               id: attachment.id,
               name: attachment.name,
               type: attachment.mimeType.split("/").pop()?.toUpperCase() ?? "FILE",
+              mimeType: attachment.mimeType,
               size: formatFileSize(attachment.size),
             })),
             })),
@@ -226,6 +240,35 @@ export default function EmailInboxPage() {
     setSelectedAccount("work");
   };
 
+  const importAttachment = async (
+    messageId: string,
+    attachment: MailAttachment,
+  ) => {
+    const alreadyExists = fileStubs.some(
+      (file) => file.name.toLocaleLowerCase() === attachment.name.toLocaleLowerCase(),
+    );
+    if (
+      alreadyExists &&
+      !window.confirm(
+        `Die Datei "${attachment.name}" ist bereits vorhanden. Soll sie erneut importiert werden?`,
+      )
+    ) {
+      return;
+    }
+    setDownloadedAttachment(attachment.id);
+    try {
+      const { data } = await apiClient.get<Blob>(
+        `/api/v1/email/gmail/messages/${encodeURIComponent(messageId)}/attachments/${encodeURIComponent(attachment.id)}`,
+        { responseType: "blob" },
+      );
+      await addFiles([
+        new File([data], attachment.name, { type: attachment.mimeType }),
+      ]);
+    } catch {
+      setDownloadedAttachment(null);
+    }
+  };
+
   return (
     <main className="email-page">
       <header className="email-page-header">
@@ -497,7 +540,7 @@ export default function EmailInboxPage() {
                               <CloudDownloadOutlinedIcon fontSize="small" />
                             }
                             onClick={() =>
-                              setDownloadedAttachment(attachment.id)
+                              void importAttachment(selectedMessage.id, attachment)
                             }
                           >
                             {downloadedAttachment === attachment.id