Add end-to-end tests for TLS RPT report ingestion and WebSocket event handling

- Implemented tests for ingesting TLS RPT reports from emails and ensuring they are stored correctly in the database.
- Added tests to verify that the same report can be ingested multiple times without duplication.
- Created tests for backfilling reports that were previously delivered to the inbox.
- Developed WebSocket event handling tests to ensure events are correctly routed to subscribers based on mailbox ownership.
- Included tests for the mail API to validate session handling, mailbox isolation, and error mapping.
- Ensured that the API rejects unauthorized requests and handles malformed JSON gracefully.

services/webmail/src/app/(user)/user/layout.tsx

@@ -43,6 +43,9 @@ export default function UserWebmailLayout({ children }: { children: React.ReactN
     { href: "/user/mail/archive", label: t("mail.archive"), icon: Archive, role: "archive" },
     { href: "/user/mail/junk", label: t("mail.junk"), icon: AlertTriangle, role: "junk" },
     { href: "/user/mail/trash", label: t("mail.trash"), icon: Trash2, role: "trash" },
+    // Where delivered DMARC and TLS-RPT reports are filed. Matched by name
+    // rather than a special-use role, because IMAP defines none for reports.
+    { href: "/user/mail/reports", label: t("mail.reports"), icon: ShieldCheck, role: "reports" },
   ];
 
   const handleLogout = () => {

services/webmail/src/app/(user)/user/mail/[folder]/page.tsx

@@ -306,6 +306,7 @@ export default function MailFolderPage({ params }: { params: Promise<{ folder: s
     archive: t("mail.archive"),
     junk: t("mail.junk"),
     trash: t("mail.trash"),
+    reports: t("mail.reports"),
   };
   const folderTitle = FOLDER_LABELS[folder.toLowerCase()] ?? folder;
 

services/webmail/src/compose-draft-integrity.test.ts

@@ -80,3 +80,23 @@ describe("deleting a message", () => {
     expect(del.slice(0, 1200)).toMatch(/setMessages\(/);
   });
 });
+
+describe("the Reports folder", () => {
+  // DMARC and TLS-RPT reports are parsed on arrival and filed here instead of
+  // the inbox. The sidebar is a fixed list, so without an entry the folder
+  // exists and receives mail that no screen can reach.
+  it("is reachable from the sidebar", () => {
+    const layout = code("src/app/(user)/user/layout.tsx");
+    expect(layout).toContain("/user/mail/reports");
+  });
+
+  it("is named through the translator, not hardcoded", () => {
+    const layout = code("src/app/(user)/user/layout.tsx");
+    expect(layout).toMatch(/t\("mail\.reports"\)/);
+  });
+
+  it("has a title on the message list too", () => {
+    const page = code(MAIL_PAGE);
+    expect(page).toMatch(/reports:\s*t\("mail\.reports"\)/);
+  });
+});