Merge remote-tracking branch 'origin/main' into feature/scheduled-send

# Conflicts:
#	app/[locale]/page.tsx
#	components/email/email-composer.tsx
#	components/email/email-viewer.tsx

lib/__tests__/jmap-send-threading.test.ts

@@ -123,7 +123,7 @@ describe('JMAPClient.sendEmail threading headers', () => {
     const create = setCall[1].create as Record<string, Record<string, unknown>>;
     const draft = Object.values(create)[0];
 
-    // Bare msg-ids per RFC 8621 — angle brackets stripped.
+    // Bare msg-ids per RFC 8621 - angle brackets stripped.
     expect(draft.inReplyTo).toEqual(['parent@example.com']);
     expect(draft.references).toEqual(['root@example.com', 'parent@example.com']);
   });