feat: add unsubscribe functionality for push notifications and update key/cert file paths

frontend/vue-app/src/components/shared/LoginButton.vue

@@ -12,10 +12,14 @@ import {
   hasPendingReturnUrl,
   clearPendingReturnUrl,
 } from '../../stores/auth'
-import { getCachedImageUrl, getCachedImageBlob } from '@/common/imageCache'
+import { getCachedImageBlob } from '@/common/imageCache'
 import '@/assets/styles.css'
 import ModalDialog from './ModalDialog.vue'
-import { subscribeToPushWithResult, isPushOptedOut } from '@/services/pushSubscription'
+import {
+  subscribeToPushWithResult,
+  unsubscribeFromPush,
+  isPushOptedOut,
+} from '@/services/pushSubscription'
 
 const router = useRouter()
 const show = ref(false)
@@ -157,6 +161,7 @@ function handlePinInput(event: Event) {
 }
 
 const handleLogout = () => {
+  unsubscribeFromPush()
   logoutParent()
   router.push('/child')
 }