Guard the Bluetooth power check and cover it

Every other bluetoothctl call in the script is silenced and time-boxed;
the new power check was neither, so a wedged D-Bus could hang pair before
it reached its own timeout and spill dbus assertions onto stderr.

Cover both paths with a stubbed bluetoothctl: the power-on sequence is
skipped when the adapter reports Powered: yes, and still runs when it
does not.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

bin/omarchy-bluetooth-device

@@ -19,7 +19,7 @@ address=${2:-}
 [[ $address =~ ^([0-9A-Fa-f]{2}:){5}[0-9A-Fa-f]{2}$ ]] || usage
 
 power_on() {
-  bluetoothctl show | grep -Fq "Powered: yes" && return
+  [[ $(timeout 2s bluetoothctl show 2>/dev/null) == *"Powered: yes"* ]] && return
   bluetoothctl power on >/dev/null 2>&1 || true
   sleep 0.5
 }