Fix tenant event form package selector so it no longer renders empty-value options, handles loading/empty

states, and pulls data from the authenticated /api/v1/tenant/packages endpoint.
    (resources/js/admin/pages/EventFormPage.tsx, resources/js/admin/api.ts)
  - Harden tenant-admin auth flow: prevent PKCE state loss, scope out StrictMode double-processing, add SPA
    routes for /event-admin/login and /event-admin/logout, and tighten token/session clearing semantics (resources/js/admin/auth/{context,tokens}.tsx, resources/js/admin/pages/{AuthCallbackPage,LogoutPage}.tsx,
    resources/js/admin/router.tsx, routes/web.php)

resources/views/emails/contact-confirmation.blade.php

@@ -1,10 +1,7 @@
 @component('mail::message')
-# Hallo {{ $name }},
+# {{ __('emails.contact_confirmation.greeting', ['name' => $name]) }}
 
-vielen Dank fuer Ihre Nachricht an das Fotospiel Team. Wir melden uns so schnell wie moeglich bei Ihnen.
+{{ __('emails.contact_confirmation.body') }}
 
-Falls Sie weitere Informationen hinzufuegen moechten, antworten Sie einfach auf diese E-Mail.
-
-Viele Gruesse  
-Ihr Fotospiel Team
+{{ __('emails.contact_confirmation.footer') }}
 @endcomponent