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

plugins/warranty/frontend/views/DellWarrantySettings.vue

@@ -4,6 +4,23 @@
       <h2>Dell Warranty Lookup</h2>
     </div>
 
+    <div class="section-card">
+      <div class="setting-group">
+        <p class="setting-description">
+          How far ahead the dashboard counts a warranty as expiring.
+        </p>
+        <div class="setting-row">
+          <label>
+            <span>Expiring window (days)</span>
+            <input type="number" min="1"
+                   v-model.number="settings.warranty_expiringdays"
+                   @blur="saveSetting('warranty_expiringdays', settings.warranty_expiringdays)"
+                   :disabled="saving">
+          </label>
+        </div>
+      </div>
+    </div>
+
     <div class="section-card">
       <div class="setting-group">
         <p class="setting-description">