Fix structuredClone compatibility issue for Node.js 16.x

Co-authored-by: rajbos <6085745+rajbos@users.noreply.github.com>

Author: Copilot

eslint.config.mjs

@@ -38,7 +38,38 @@ export default [
       prettier: prettier
     },
     rules: {
-      ...js.configs.recommended.rules,
+      // Basic ESLint recommended rules (manually selected to avoid structuredClone dependency)
+      'no-constant-binary-expression': 'error',
+      'no-constant-condition': 'error',
+      'no-control-regex': 'error',
+      'no-debugger': 'error',
+      'no-dupe-args': 'error',
+      'no-dupe-keys': 'error',
+      'no-duplicate-case': 'error',
+      'no-empty': 'error',
+      'no-empty-character-class': 'error',
+      'no-ex-assign': 'error',
+      'no-extra-boolean-cast': 'error',
+      'no-func-assign': 'error',
+      'no-invalid-regexp': 'error',
+      'no-irregular-whitespace': 'error',
+      'no-loss-of-precision': 'error',
+      'no-misleading-character-class': 'error',
+      'no-prototype-builtins': 'error',
+      'no-regex-spaces': 'error',
+      'no-shadow-restricted-names': 'error',
+      'no-sparse-arrays': 'error',
+      'no-unexpected-multiline': 'error',
+      'no-unreachable': 'error',
+      'no-unsafe-finally': 'error',
+      'no-unsafe-negation': 'error',
+      'no-unused-labels': 'error',
+      'no-useless-catch': 'error',
+      'no-useless-escape': 'error',
+      'no-with': 'error',
+      'require-yield': 'error',
+      'use-isnan': 'error',
+      'valid-typeof': 'error',
 
       // Disable conflicting rules
       'i18n-text/no-en': 'off',