show error message if no camera is present

src/components/Scanner.tsx

@@ -138,6 +138,14 @@ export default function Scanner({ onScan }: ScannerProps) {
 
   return (
     <div className="w-full max-w-2xl mx-auto">
+      {hasCamera === false ? (
+        <div className="p-4 text-center">
+          <p className="text-red-600 text-lg">
+            Denne nettsiden krever tilgang til et kamera.
+          </p>
+        </div>
+      ) : (
+        <>
           <div className={getVideoContainerClass()}>
             <video
               ref={videoRef}
@@ -270,6 +278,9 @@ export default function Scanner({ onScan }: ScannerProps) {
               )}
             </div>
           </div>
+        </>
+      )}
+
       <style jsx>{`
         /* Responsive video container for mobile portrait */
         @media (max-width: 768px) and (orientation: portrait) {