This PR implements a confirmation popup on the Domain settings page when a user attempts to save a subdomain change. - When the user saves the updated subdomain, a confirmation modal is shown. - The modal informs the user that changing the subdomain will log them and all other users out. - If the user confirms, the subdomain change proceeds as normal. - If the user cancels, the update is aborted and no changes are made. ### Demo https://github.com/user-attachments/assets/dcea51c8-ffd2-40ca-bc75-0c0228df5344 Related Issue Closes #11741