fix: improve camera permission error feedback

- Add user-visible notification when camera access is denied
- Keep error message in UI for better visibility
- Pass notification timeout as second argument

src/views/ContactQRScanShowView.vue

@@ -220,6 +220,13 @@ export default class ContactQRScanShow extends Vue {
         if (!granted) {
           this.error = "Camera permission denied";
           this.isScanning = false;
+          // Show notification for better visibility
+          this.$notify({
+            group: "alert",
+            type: "warning",
+            title: "Camera Access Required",
+            text: "Camera permission denied"
+          }, 5000);
           return;
         }
       }