feat: Allow event owners to delete their own events and admins to delete any event with UI action buttons and confirmation dialog

frontend/src/pages/HomePage.jsx

@@ -1,7 +1,7 @@
 /* Hallmark · pre-emit critique: P5 H5 E5 S5 R5 V5 */
 /* Hallmark · redesign: HomePage · studied-DNA: https://inihaus.de · macrostructure: Newsstand Feed */
 import React, { useState } from 'react';
-import { Search, Calendar, MapPin, Clock, ArrowRight, Plus, EyeOff, CheckCircle2, Edit3, ShieldAlert } from 'lucide-react';
+import { Search, Calendar, MapPin, Clock, ArrowRight, Plus, EyeOff, CheckCircle2, Edit3, ShieldAlert, Trash2 } from 'lucide-react';
 
 export default function HomePage({
   events,
@@ -10,6 +10,7 @@ export default function HomePage({
   onOpenCreateEvent,
   onToggleEventActive,
   onEditEvent,
+  onDeleteEvent,
   branding
 }) {
   const [searchQuery, setSearchQuery] = useState('');
@@ -212,6 +213,16 @@ export default function HomePage({
                             {evt.is_active !== false ? <EyeOff className="w-3.5 h-3.5" /> : <CheckCircle2 className="w-3.5 h-3.5" />}
                           </button>
                         )}
+
+                        {(isUserAdmin || (user && (evt.created_by === user.id || evt.created_by?.id === user.id))) && onDeleteEvent && (
+                          <button
+                            onClick={() => onDeleteEvent(evt)}
+                            className="py-1.5 px-2 rounded-sm text-[10px] font-mono font-bold bg-red-500/10 text-red-400 border border-red-500/20 hover:bg-red-500/20 transition flex items-center gap-1 shrink-0"
+                            title="Veranstaltung unwiderruflich löschen"
+                          >
+                            <Trash2 className="w-3.5 h-3.5" />
+                          </button>
+                        )}
                       </div>
                     </div>
                   </div>