Only restart samba when its config changes

state: restarted is unconditional, so every run reported a change and bounced
smbd - which is the share the music is copied over, so a run during a transfer
would interrupt it. Start/enable it as a task, restart it from a handler the
config copy notifies.

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

roles/pi_musicmouse/tasks/main.yml

@@ -217,13 +217,13 @@
     src: smb.conf
     dest: /etc/samba/
     mode: "0644"
+  notify: Restart samba
 
-- name: Restart samba
+- name: Enable samba
   ansible.builtin.systemd:
     name: smbd
-    state: restarted
-    enabled: "yes"
-    daemon_reload: "yes"
+    state: started
+    enabled: true
 # manual steps:
 #    - set samba passwords with smbpasswd
 #    - copy music into /media/musicmouse: scripts/sync-library.sh in the app repo, which