Add a new field `consecutiveFailures` to the Inbox model to track consecutive errors. Update the inbox guard logic to mark mailboxes as error after exceeding a failure threshold. Implement retry logic in email and IMAP services to handle transient connection issues. Adjust job processing to reclaim stale send jobs and improve overall reliability of email dispatching. Update routes to initialize `consecutiveFailures` on inbox creation and reset it when the inbox status changes to active.
