v0.5.8

Added

• Sleep-on-battery threshold. New BATTERY_MIN_PERCENT config key
  (default 0 = disabled). When set, niri-screensaver-launch skips
  auto-launch if the machine is running on battery below that percentage,
  to save power. Plugged in (any AC/Mains adapter online) or no battery
  present (desktop) never skips; launch force overrides the check.
  Surfaced in the Noctalia plugin as a new Power settings section
  ("Skip on battery below %"), and reported in niri-screensaver-ctl status when enabled. Battery state is read from
  /sys/class/power_supply/* by type (so adapter/battery naming is
  irrelevant); multiple batteries use the most-drained one.

Fixed

• niri-screensaver-ctl effects listed every TTE effect twice. tte -h
  prints the {beams,...} choices block twice (usage line + positional
  args); get_effects now takes only the first occurrence (grep -m1).