feat(notifications): add delete functionality for individual and all notifications

feat(guest-join): support access code in guest join URL

src/pages/GuestJoin.jsx

@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react';
-import { useParams, Link } from 'react-router-dom';
+import { useParams, Link, useSearchParams } from 'react-router-dom';
 import { Video, User, Lock, Shield, ArrowRight, Loader2, Users, Radio, AlertCircle, FileText } from 'lucide-react';
 import BrandLogo from '../components/BrandLogo';
 import api from '../services/api';
@@ -10,6 +10,7 @@ import { useBranding } from '../contexts/BrandingContext';
 
 export default function GuestJoin() {
   const { uid } = useParams();
+  const [searchParams] = useSearchParams();
   const { t } = useLanguage();
   const { user } = useAuth();
   const { imprintUrl, privacyUrl } = useBranding();
@@ -19,7 +20,7 @@ export default function GuestJoin() {
   const [error, setError] = useState(null);
   const [joining, setJoining] = useState(false);
   const [name, setName] = useState(user?.name || '');
-  const [accessCode, setAccessCode] = useState('');
+  const [accessCode, setAccessCode] = useState(searchParams.get('ac') || '');
   const [moderatorCode, setModeratorCode] = useState('');
   const [status, setStatus] = useState({ running: false });
   const [recordingConsent, setRecordingConsent] = useState(false);