Switch to Preact for Production builds

next.config.js

@@ -1,3 +1,15 @@
 module.exports = {
   trailingSlash: true,
-};
+  webpack: (config, { dev, isServer }) => {
+    // Replace React with Preact only in client production build
+    if (!dev && !isServer) {
+      Object.assign(config.resolve.alias, {
+        react: 'preact/compat',
+        'react-dom/test-utils': 'preact/test-utils',
+        'react-dom': 'preact/compat',
+      });
+    }
+  
+    return config;
+  },
+};