ENH - unify phone notifications as popups

Replace the central Konsta notification banner with the shared Sky UI popup across phone and preview surfaces. Add light and dark materials, app icons, timestamps, routed opening, swipe dismissal, and contract coverage.

frontend/src/App.vue

@@ -1311,6 +1311,17 @@ onMounted(() => {
     if (developmentParameters.has('payphonePreview')) {
       openDevelopmentPayphonePreview()
     }
+    if (developmentParameters.has('notificationPreview')) {
+      window.setTimeout(() => {
+        notifications.show({
+          appId: 'messages',
+          persistent: true,
+          route: '/apps/messages',
+          text: 'You still got that spare alternator?',
+          title: 'Tommy V',
+        })
+      }, 250)
+    }
   }
 })