refactor(register): drop auth-store dependency from success.vue, rely on query param

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/app/src/pages/register/success.vue

@@ -1,6 +1,4 @@
 <script setup lang="ts">
-import { usePortalAuthStore } from '@/stores/portal/usePortalAuthStore'
-
 definePage({
   name: 'register-success',
   meta: {
@@ -10,11 +8,10 @@ definePage({
 })
 
 const route = useRoute('register-success')
-const authStore = usePortalAuthStore()
 
 const eventName = computed(() => (route.query.event as string) || 'het evenement')
 const bannerUrl = computed(() => (route.query.banner as string) || null)
-const isAuthenticated = computed(() => route.query.authenticated === '1' || authStore.isAuthenticated)
+const isAuthenticated = computed(() => route.query.authenticated === '1')
 </script>
 
 <template>