fix(playground): mock @react-email/render for cf build

Author: onmax

playground/nuxt.config.ts

@@ -34,5 +34,7 @@ export default defineNuxtConfig({
     '/two-factor/otp': { auth: false },
   },
 
+  nitro: { alias: { '@react-email/render': 'unenv/runtime/mock/empty' } },
+
   compatibilityDate: '2025-01-01',
 })