fix: larger QR code (280px) + scanner URL trim + return guard

Author: Ravi Singh

firmware/receiver-c3/components/web_server/web_server.c

@@ -426,7 +426,7 @@ static const char DASHBOARD_HTML[] =
 /* Fallback: just show the URL text for manual entry */
 "const c=document.getElementById('qr-container');"
 "try{"
-  "const size=200;"
+  "const size=280;"
   "c.innerHTML=`<img src='https://api.qrserver.com/v1/create-qr-code/?size=${size}x${size}&data=${encodeURIComponent(d.url)}&bgcolor=FFFFFF&color=000000' "
   "width='${size}' height='${size}' alt='QR Code' style='image-rendering:pixelated' "
   "onerror=\"this.parentNode.innerHTML='<div style=color:#000;padding:2rem;font-size:.8rem>QR GENERATION FAILED<br>USE THE LINK BELOW</div>'\">`;"

firmware/receiver/components/web_server/web_server.c

@@ -426,7 +426,7 @@ static const char DASHBOARD_HTML[] =
 /* Fallback: just show the URL text for manual entry */
 "const c=document.getElementById('qr-container');"
 "try{"
-  "const size=200;"
+  "const size=280;"
   "c.innerHTML=`<img src='https://api.qrserver.com/v1/create-qr-code/?size=${size}x${size}&data=${encodeURIComponent(d.url)}&bgcolor=FFFFFF&color=000000' "
   "width='${size}' height='${size}' alt='QR Code' style='image-rendering:pixelated' "
   "onerror=\"this.parentNode.innerHTML='<div style=color:#000;padding:2rem;font-size:.8rem>QR GENERATION FAILED<br>USE THE LINK BELOW</div>'\">`;"

pwa/client/src/pages/SetupWizard.jsx

@@ -59,12 +59,14 @@ export default function SetupWizard() {
           });
 
           if (code && code.data) {
+            const scanned = code.data.trim();
             try {
-              const parsed = new URL(code.data);
-              // New format: http://<ip>/claim — open directly (receiver handles redirect)
+              const parsed = new URL(scanned);
+              // New format: http://<ip>/claim
               if (parsed.pathname === '/claim') {
                 stopScan();
-                window.location.href = code.data;
+                window.location.href = scanned;
+                return;
               }
               // Old format: https://cloud/link?id=...&token=...&ip=...
               const id = parsed.searchParams.get('id');
@@ -73,6 +75,7 @@ export default function SetupWizard() {
               if (id && token && ip) {
                 stopScan();
                 window.location.href = `/link?id=${id}&token=${token}&ip=${ip}`;
+                return;
               }
             } catch {} // Not a valid URL — keep scanning
           }