add live QR code next to referral link that updates with username

index.html

@@ -481,6 +481,10 @@
       <button class="copy-sm-btn" id="copyLinkBtn" onclick="copySharedLink()">📄 Copy</button>
     </div>
     <div class="sub-hint">The referral opens the calculator with your username pre-loaded</div>
+    <div class="qr-row" style="margin-top: 12px; text-align: center;">
+      <img id="refQrCode" src="https://api.qrserver.com/v1/create-qr-code/?size=200x200&data=https://cbp-calculator.saasy.top?ref=cryptoteambuild" alt="QR Code" style="width:160px;height:160px;border-radius:12px;border:2px solid var(--border);">
+      <div style="font-size:12px;color:var(--text-secondary);margin-top:6px;">📱 Scan to open calculator</div>
+    </div>
   </div>
 </div>
 
@@ -1146,6 +1150,11 @@ function updateSharedLinkBox() {
   if (signupBtn) {
     signupBtn.href = `https://clickbaitpays.me/?ref=${refUser}`;
   }
+  // Update QR code
+  const qrImg = document.getElementById('refQrCode');
+  if (qrImg) {
+    qrImg.src = `https://api.qrserver.com/v1/create-qr-code/?size=200x200&data=${encodeURIComponent(shareUrl)}`;
+  }
 }
 
 function copySharedLink() {