- Reworked the tenant admin login page

- Updated the User model to implement Filament’s tenancy contracts
- Seeded a ready-to-use demo tenant (user, tenant, active package, purchase)
- Introduced a branded, translated 403 error page to replace the generic forbidden message for unauthorised admin hits
- Removed the public “Register” links from the marketing header
- hardened join event logic and improved error handling in the guest pwa.

resources/js/admin/pages/EventsPage.tsx

@@ -1,6 +1,6 @@
 import React from 'react';
 import { Link, useNavigate } from 'react-router-dom';
-import { ArrowRight, CalendarDays, Plus, Settings, Sparkles } from 'lucide-react';
+import { ArrowRight, CalendarDays, Plus, Settings, Sparkles, Share2 } from 'lucide-react';
 
 import { Alert, AlertDescription, AlertTitle } from '@/components/ui/alert';
 import { Badge } from '@/components/ui/badge';
@@ -156,9 +156,9 @@ function EventCard({ event }: { event: TenantEvent }) {
           <Link to={ADMIN_EVENT_TASKS_PATH(slug)}>Tasks</Link>
         </Button>
         <Button asChild variant="outline" className="border-slate-200 text-slate-700 hover:bg-slate-50">
-          <a href={`/e/${slug}`} target="_blank" rel="noreferrer">
-            Oeffnen im Gastportal
-          </a>
+          <Link to={`${ADMIN_EVENT_VIEW_PATH(slug)}#join-invites`}>
+            <Share2 className="h-3.5 w-3.5" /> Einladungen
+          </Link>
         </Button>
       </div>
     </div>