A manual `off` now drops ~/.local/state/nomarchy/nightlight-off and the
hyprsunset unit refuses to (re)start while it exists
(Unit.ConditionPathExists=!%h/...), so the off survives logout/reboot
until toggled back on. `on`/toggle-on remove the marker before starting
(a failed condition would otherwise no-op the start). Without the marker
behaviour is unchanged: the service stays WantedBy=graphical-session.target
and resumes its schedule at login, so persistence is opt-in via the toggle.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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