fix(pdp-image-white-bg): product detail image card background must be white

work/artifacts/PDP-IMAGE-WHITE-BG/implementer.md

@@ -0,0 +1,11 @@
+# Implementer evidence — PDP-IMAGE-WHITE-BG
+
+## Resumen
+Cambiado `bg-gray-50` → `bg-white` en la tarjeta de imagen del producto en `/products/[slug]/page.tsx`.
+
+## Cambio
+Línea 114: `bg-gray-50 rounded-2xl` → `bg-white rounded-2xl`
+
+## Validación
+- `cd project/frontend && npm run build` ✅
+- `git diff --check` ✅