Send grace-entered and countdown emails to owners alongside recipient grace milestones so unpaid transfers get clear wallet top-up reminders before deletion.
Co-authored-by: Cursor <cursoragent@cursor.com>
Files stay available while wallet renewals succeed each month. Failed renewals
keep files for TRANSFER_GRACE_PERIOD_DAYS (default 15) before automatic cleanup.
Co-authored-by: Cursor <cursoragent@cursor.com>