New "Lock admin during backup" option (on by default). While a stepped
backup is running, every admin page load except the full-screen backup
screen and the login page is replaced by a "backup in progress"
interstitial that auto-refreshes, so no other window can navigate or change
anything mid-backup.
Detection uses the stepped-backup session file heartbeat
(JPATH_ROOT/tmp/mokosuitebackup-sessions/mb_*.json is rewritten every step
and deleted on completion) — a file with an mtime within ~45s means a
backup is live. A crashed/abandoned backup goes stale and releases the lock
on its own, so the admin is never permanently locked. Implemented in the
system plugin's onAfterRoute (admin, HTML page loads only; AJAX/assets and
the backup's own step requests are unaffected).
Claude-Session: https://claude.ai/code/session_01WbGBN9VyRK61zczYWcCQ2i
jmiller