fix(club): use real scannable QR code instead of pseudo-random grid

project/frontend/src/components/club/ClubExperience.tsx

@@ -2,6 +2,7 @@
 
 import Link from 'next/link';
 import { useRouter } from 'next/navigation';
+import qrcode from 'qrcode';
 import { useEffect, useMemo, useState } from 'react';
 
 type ClubMode = 'landing' | 'join' | 'card';
@@ -101,43 +102,11 @@ function isIosDevice(): boolean {
   return /iphone|ipad|ipod/i.test(window.navigator.userAgent);
 }
 
-function buildVisualCode(seed: string): boolean[][] {
+function buildVisualCode(_seed: string): boolean[][] {
+  // DEPRECATED: replaced by MemberQrCode component using real QR codes.
+  // Kept as a no-op stub for backward compatibility (tests, etc.).
   const size = 21;
-  const grid = Array.from({ length: size }, () => Array.from({ length: size }, () => false));
-
-  const drawFinder = (startRow: number, startCol: number) => {
-    for (let row = 0; row < 7; row += 1) {
-      for (let col = 0; col < 7; col += 1) {
-        const edge = row === 0 || row === 6 || col === 0 || col === 6;
-        const center = row >= 2 && row <= 4 && col >= 2 && col <= 4;
-        grid[startRow + row]![startCol + col] = edge || center;
-      }
-    }
-  };
-
-  drawFinder(0, 0);
-  drawFinder(0, size - 7);
-  drawFinder(size - 7, 0);
-
-  let hash = 0;
-  for (let index = 0; index < seed.length; index += 1) {
-    hash = (hash * 33 + seed.charCodeAt(index)) >>> 0;
-  }
-
-  for (let row = 0; row < size; row += 1) {
-    for (let col = 0; col < size; col += 1) {
-      const inFinder =
-        (row < 7 && col < 7) ||
-        (row < 7 && col >= size - 7) ||
-        (row >= size - 7 && col < 7);
-      if (inFinder) continue;
-      const bit = ((hash >> ((row + col) % 24)) ^ ((row + 1) * 17) ^ ((col + 1) * 31)) & 1;
-      grid[row]![col] = bit === 1;
-      hash = ((hash * 1664525 + 1013904223) >>> 0) ^ (row * 97 + col * 53);
-    }
-  }
-
-  return grid;
+  return Array.from({ length: size }, () => Array.from({ length: size }, () => false));
 }
 
 function InstallButton() {
@@ -198,26 +167,37 @@ function InstallButton() {
 }
 
 function MemberVisualCode({ memberCode }: { memberCode: string }) {
-  const cells = useMemo(() => buildVisualCode(memberCode), [memberCode]);
+  const [svg, setSvg] = useState<string>('');
+
+  useEffect(() => {
+    let cancelled = false;
+    qrcode
+      .toString(memberCode, {
+        type: 'svg',
+        errorCorrectionLevel: 'M',
+        margin: 2,
+        width: 220,
+        color: { dark: '#1B4332', light: '#ffffff' },
+      })
+      .then((output) => {
+        if (!cancelled) setSvg(output);
+      })
+      .catch(() => {
+        if (!cancelled) setSvg('');
+      });
+    return () => {
+      cancelled = true;
+    };
+  }, [memberCode]);
+
+  if (!svg) return null;
   return (
-    <svg viewBox="0 0 210 210" className="h-44 w-44 rounded-3xl bg-white p-4 shadow-inner">
-      <rect width="210" height="210" rx="24" fill="white" />
-      {cells.flatMap((row, rowIndex) =>
-        row.map((value, colIndex) =>
-          value ? (
-            <rect
-              key={`${rowIndex}-${colIndex}`}
-              x={colIndex * 10}
-              y={rowIndex * 10}
-              width="10"
-              height="10"
-              rx="2"
-              fill="#1B4332"
-            />
-          ) : null,
-        ),
-      )}
-    </svg>
+    <div
+      className="h-44 w-44 rounded-3xl bg-white p-3 shadow-inner [&_svg]:h-full [&_svg]:w-full"
+      role="img"
+      aria-label={`Código QR del socio ${memberCode}`}
+      dangerouslySetInnerHTML={{ __html: svg }}
+    />
   );
 }