feat(portal): horizontal navbar layout with avatar menu and profile restructuring

Replace the simple inline header with a proper Vuexy-style horizontal
navbar featuring left (logo + event switcher), center (conditional menu
items based on approval status), and right (avatar dropdown with profile
link and logout) sections. Move profile page from /profile to /profiel
as a platform-level page with "Mijn evenementen" section, removing the
event-scoped status card and remarks field. Registration and success
pages now use the portal layout with hideEventMenu meta so they get the
navbar when logged in but no event menu items.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/portal/components.d.ts

@@ -46,5 +46,6 @@ declare module 'vue' {
     TheCustomizer: typeof import('./src/@core/components/TheCustomizer.vue')['default']
     ThemeSwitcher: typeof import('./src/@core/components/ThemeSwitcher.vue')['default']
     TiptapEditor: typeof import('./src/@core/components/TiptapEditor.vue')['default']
+    UserAvatarMenu: typeof import('./src/components/portal/UserAvatarMenu.vue')['default']
   }
 }