The browse picker swallowed SessionActiveWriteGuardError into a generic
"Delete failed.", and the dashboard bulk delete only reported the deleted
count, silently keeping rows a live turn owns. Surface both: the picker
flashes that the session is active, and SessionsPage shows a toast with the
skipped_active count (new en key; other locales fall back to English via
defineLocale). Also move the api_server import into its sorted slot.