Gate both kiosks behind a device token, and make an unreachable setting a test failure

plugins/printers/frontend/views/PrinterAlertsSettings.vue

@@ -26,6 +26,16 @@
           <input v-model.number="values.printers_alert_critical_threshold"
                  type="number" min="0" max="100" class="form-control" />
         </div>
+        <div class="form-group">
+          <label>Dashboard threshold (% remaining)</label>
+          <input v-model.number="values.printers_dashboardpercent"
+                 type="number" min="0" max="100" class="form-control" />
+          <p class="field-hint">
+            At or below this, a printer's supply shows on the dashboard. Separate
+            from the alert thresholds above: this one only decides what is
+            listed, it sends nothing.
+          </p>
+        </div>
       </div>
 
       <div class="form-group">
@@ -101,7 +111,8 @@ const KEYS = [
   'printers_alert_roleids',
   'printers_alert_supportteamid',
   'printers_alert_warning_threshold',
-  'printers_alert_critical_threshold'
+  'printers_alert_critical_threshold',
+  'printers_dashboardpercent'
 ]
 
 const values = ref({
@@ -110,6 +121,7 @@ const values = ref({
   printers_alert_roleids: '',
   printers_alert_supportteamid: '',
   printers_alert_warning_threshold: 5,
+  printers_dashboardpercent: 5,
   printers_alert_critical_threshold: 0
 })
 const supportTeams = ref([])