[sway] capture PowerOff button and show wlogout dialog

overlays/sway/etc/sway/modes/default-mode

@@ -37,6 +37,9 @@ bindsym XF86AudioRaiseVolume exec amixer -q sset 'Master' 5%+
 bindsym XF86MonBrightnessDown exec light -U 5
 bindsym XF86MonBrightnessUp exec light -A 5
 
+# capture PowerOff key
+bindsym XF86PowerOff exec $logout
+
 #
 # Moving around:
 #

overlays/sway/etc/systemd/logind.conf

+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+#
+# Entries in this file show the compile time defaults.
+# You can change settings by editing this file.
+# Defaults can be restored by simply deleting this file.
+#
+# See logind.conf(5) for details.
+
+[Login]
+#NAutoVTs=6
+#ReserveVT=6
+#KillUserProcesses=no
+#KillOnlyUsers=
+#KillExcludeUsers=root
+#InhibitDelayMaxSec=5
+HandlePowerKey=ignore
+#HandleSuspendKey=suspend
+#HandleHibernateKey=hibernate
+#HandleLidSwitch=suspend
+#HandleLidSwitchExternalPower=suspend
+#HandleLidSwitchDocked=ignore
+#PowerKeyIgnoreInhibited=no
+#SuspendKeyIgnoreInhibited=no
+#HibernateKeyIgnoreInhibited=no
+#LidSwitchIgnoreInhibited=yes
+#HoldoffTimeoutSec=30s
+#IdleAction=ignore
+#IdleActionSec=30min
+#RuntimeDirectorySize=10%
+#RemoveIPC=yes
+#InhibitorsMax=8192
+#SessionsMax=8192