Show OSD feedback when rebooting or shutting down

Adds named reboot and shutdown OSD icons, and gives the touchscreen
toggle a proper gesture-tap glyph instead of the restart arrow it
was accidentally using.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

bin/omarchy-system-reboot

@@ -8,6 +8,8 @@
 # scope cannot terminate it before it runs.
 systemd-run --user --collect --quiet --on-active="2s" --timer-property=AccuracySec=100ms systemctl reboot --no-wall || exit 1
 
+omarchy-osd -i reboot -m "Rebooting…" -d 5000
+
 omarchy-state clear re*-required
 
 # Now close all windows

bin/omarchy-system-shutdown

@@ -8,6 +8,8 @@
 # scope cannot terminate it before it runs.
 systemd-run --user --collect --quiet --on-active="2s" --timer-property=AccuracySec=100ms systemctl poweroff --no-wall || exit 1
 
+omarchy-osd -i shutdown -m "Shutting down…" -d 5000
+
 omarchy-state clear re*-required
 
 # Now close all windows