Update guest v2 branding and theming

resources/js/guest-v2/screens/LandingScreen.tsx

@@ -10,7 +10,8 @@ import { QrCode, ArrowRight } from 'lucide-react';
 import { useTranslation } from '@/guest/i18n/useTranslation';
 import { fetchEvent } from '../services/eventApi';
 import { readGuestName } from '../context/GuestIdentityContext';
-import { useAppearance } from '@/hooks/use-appearance';
+import EventLogo from '../components/EventLogo';
+import { useGuestThemeVariant } from '../lib/guestTheme';
 
 const qrConfig = { fps: 10, qrbox: { width: 240, height: 240 } } as const;
 
@@ -24,14 +25,14 @@ export default function LandingScreen() {
   const [errorKey, setErrorKey] = React.useState<LandingErrorKey | null>(null);
   const [isScanning, setIsScanning] = React.useState(false);
   const scannerRef = React.useRef<Html5Qrcode | null>(null);
-  const { resolved } = useAppearance();
-  const isDark = resolved === 'dark';
+  const { isDark } = useGuestThemeVariant();
   const cardBackground = isDark ? 'rgba(15, 23, 42, 0.7)' : 'rgba(255, 255, 255, 0.9)';
   const cardBorder = isDark ? 'rgba(148, 163, 184, 0.2)' : 'rgba(15, 23, 42, 0.12)';
   const primaryText = isDark ? '#F8FAFF' : '#0F172A';
   const mutedText = isDark ? 'rgba(226, 232, 240, 0.78)' : 'rgba(15, 23, 42, 0.6)';
   const mutedButton = isDark ? 'rgba(248, 250, 255, 0.1)' : 'rgba(15, 23, 42, 0.06)';
   const mutedButtonBorder = isDark ? 'rgba(248, 250, 255, 0.2)' : 'rgba(15, 23, 42, 0.12)';
+  const brandName = 'Fotospiel';
 
   const errorMessage = errorKey ? t(`landing.errors.${errorKey}`) : null;
 
@@ -159,6 +160,12 @@ export default function LandingScreen() {
   return (
     <YStack flex={1} minHeight="100vh" padding="$5" justifyContent="center" backgroundColor={isDark ? '#0B101E' : '#FFF8F5'}>
       <YStack gap="$5" maxWidth={480} width="100%" alignSelf="center">
+        <XStack alignItems="center" gap="$3">
+          <EventLogo name={brandName} size="s" />
+          <Text fontSize="$5" fontFamily="$display" fontWeight="$8" color={primaryText}>
+            {brandName}
+          </Text>
+        </XStack>
         <YStack gap="$2">
           <Text fontSize="$8" fontFamily="$display" fontWeight="$9" color={primaryText}>
             {t('landing.pageTitle')}