Add Stop Podman to Settings, alongside Start/Restart

Rounds out the Podman Service card to the full start/stop/restart trio.
Stop and Restart both get a confirm() first — both actually stop every
running container (with its own configured grace period) before touching
the API service itself, not just the service process; worth surfacing
that explicitly rather than letting it be a surprise.

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

webui/plugins/podman/javascript/settings.js

@@ -72,8 +72,13 @@
     }
   }
 
+  function serviceButtons() {
+    return ['settings-service-status-btn', 'settings-service-start-btn', 'settings-service-stop-btn', 'settings-service-restart-btn']
+      .map(function (id) { return P.el(id); });
+  }
+
   function refreshServiceStatus() {
-    const buttons = [P.el('settings-service-status-btn'), P.el('settings-service-start-btn'), P.el('settings-service-restart-btn')];
+    const buttons = serviceButtons();
     buttons.forEach(function (b) { b.disabled = true; });
     return P.get('settings', 'service_status').then(renderServiceResult).catch(function (err) {
       P.el('settings-service-chip').className = 'podman-chip podman-chip-bad';
@@ -86,7 +91,7 @@
   }
 
   function runServiceAction(action) {
-    const buttons = [P.el('settings-service-status-btn'), P.el('settings-service-start-btn'), P.el('settings-service-restart-btn')];
+    const buttons = serviceButtons();
     buttons.forEach(function (b) { b.disabled = true; });
     P.el('settings-service-log').style.display = '';
     P.el('settings-service-log').textContent = 'Working…';
@@ -205,7 +210,14 @@
 
     P.el('settings-service-status-btn').addEventListener('click', refreshServiceStatus);
     P.el('settings-service-start-btn').addEventListener('click', function () { runServiceAction('service_start'); });
-    P.el('settings-service-restart-btn').addEventListener('click', function () { runServiceAction('service_restart'); });
+    P.el('settings-service-stop-btn').addEventListener('click', function () {
+      if (!confirm('Stop podman? All running containers will be stopped first (each with its own configured grace period).')) return;
+      runServiceAction('service_stop');
+    });
+    P.el('settings-service-restart-btn').addEventListener('click', function () {
+      if (!confirm('Restart podman? All running containers will be stopped and podman.sock will be unavailable until it comes back up.')) return;
+      runServiceAction('service_restart');
+    });
     P.el('settings-format-disk-btn').addEventListener('click', openFormatDiskModal);
 
     refreshServiceStatus();