[CCM-10893] Add account header for multi-user access (#658)

Co-authored-by: Michael Harrison <[email protected]>

Author: nicki-nhs

frontend/package.json

@@ -14,7 +14,7 @@
     "next-client-cookies": "^2.0.1",
     "nhs-notify-backend-client": "^0.0.1",
     "nhs-notify-web-template-management-utils": "^0.0.1",
-    "nhsuk-frontend": "^9.3.0",
+    "nhsuk-frontend": "^10.0.0",
     "nhsuk-react-components": "^5.0.0",
     "path": "^0.12.7",
     "react": "^19.0.0",