Switch musicdolphin's screen from the IR remote's power key

pi_kiosk installs kiosk-screen on|off|toggle|status, which switches the monitor via
DPMS on the kiosk's X display (the Dell P2419H has no HDMI-CEC). Turning it back on
also turns DPMS off again, as .xinitrc does, so the screen never blanks by itself.

musicdolphin's backend config runs `kiosk-screen toggle` for the power key (the new
screen: section, MusicMouse 2d0caeb). config.yml is install-once, so the running host
is changed by hand the same way.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

roles/pi_kiosk/tasks/main.yml

@@ -132,6 +132,13 @@
     mode: "0755"
   notify: Reload systemd and restart getty
 
+- name: Install kiosk-screen (switches the monitor on and off)
+  # Run by the MusicMouse backend for the IR remote's power key; see the template.
+  ansible.builtin.template:
+    src: kiosk-screen.j2
+    dest: /usr/local/bin/kiosk-screen
+    mode: "0755"
+
 - name: Ensure the browser policy directory exists
   ansible.builtin.file:
     path: "{{ '/etc/chromium/policies/managed' if pi_kiosk_browser == 'chromium' else '/etc/firefox-esr' }}"