no issue
- when confirming email send, after initial save in, poll every second for a maximum of 10 seconds and check the status of the email
- if it's `'success'` close the modal immediately
- if it's `'failure'` switch the confirm modal to an error state
- if the save fails for some other reason (validation, server error) close the modal immediately and let the normal editor error handling do it's thing
- fixed confirm modal not appearing when retrying a save after a post validation failed
- show email status in post status area
- `"and sending to x members"` when email is pending or submitting
- `"and sent to x members"` once email is fully submitted
