ai... rodboev's #4133, notification-feature ONLY (dropped the unrelated
'invalidate sidebar cache on WAL' commit — that's a separate good fix to split
out). Button now reflects live Notification.permission instead of silent no-op.
Co-authored-by: nesquena-hermes <agent@nesquena-hermes>
Co-authored-by: rodboev <rodboev@users.noreply.github.com>