feat: update Projects component with framer-motion variants and improve animations

refactor: modify layout to use ClientOnly and BackgroundBlobsClient components

fix: correct import statement for ActivityFeed in the main page

fix: enhance sitemap fetching logic with error handling and mock support

refactor: convert BackgroundBlobs to default export for consistency

refactor: simplify ErrorBoundary component and improve error handling UI

chore: update framer-motion to version 12.24.10 in package.json and package-lock.json

test: add minimal Prisma Client mock for testing purposes

feat: create BackgroundBlobsClient for dynamic import of BackgroundBlobs

feat: implement ClientOnly component to handle client-side rendering

feat: add custom error handling components for better user experience

app/api/email/route.tsx

@@ -17,8 +17,8 @@ function sanitizeInput(input: string, maxLength: number = 10000): string {
 
 export async function POST(request: NextRequest) {
     try {
-        // Rate limiting
-        const ip = request.headers.get('x-forwarded-for') || request.headers.get('x-real-ip') || 'unknown';
+        // Rate limiting (defensive: headers may be undefined in tests)
+        const ip = request.headers?.get?.('x-forwarded-for') ?? request.headers?.get?.('x-real-ip') ?? 'unknown';
         if (!checkRateLimit(ip, 5, 60000)) { // 5 emails per minute per IP
             return NextResponse.json(
                 { error: 'Zu viele Anfragen. Bitte versuchen Sie es später erneut.' },