fix: prevent asset conflicts between React and Grid.js versions

Add coexistence checks to all enqueue methods to prevent loading
both React and Grid.js assets simultaneously.

Changes:
- ReactAdmin.php: Only enqueue React assets when ?react=1
- Init.php: Skip Grid.js when React active on admin pages
- Form.php, Coupon.php, Access.php: Restore classic assets when ?react=0
- Customer.php, Product.php, License.php: Add coexistence checks

Now the toggle between Classic and React versions works correctly.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

node_modules/@wordpress/scripts/utils/index.js

@@ -0,0 +1,59 @@
+/**
+ * Internal dependencies
+ */
+const { getAsBooleanFromENV } = require( './process' );
+const {
+	getArgFromCLI,
+	getArgsFromCLI,
+	getFileArgsFromCLI,
+	getNodeArgsFromCLI,
+	hasArgInCLI,
+	hasFileArgInCLI,
+	spawnScript,
+} = require( './cli' );
+const {
+	getJestOverrideConfigFile,
+	getWebpackArgs,
+	getWordPressSrcDirectory,
+	getWebpackEntryPoints,
+	getRenderPropPaths,
+	hasBabelConfig,
+	hasCssnanoConfig,
+	hasJestConfig,
+	hasPostCSSConfig,
+	hasPrettierConfig,
+} = require( './config' );
+const { fromProjectRoot, fromConfigRoot, hasProjectFile } = require( './file' );
+const { getPackageProp, hasPackageProp } = require( './package' );
+const {
+	getBlockJsonModuleFields,
+	getBlockJsonScriptFields,
+} = require( './block-json' );
+
+module.exports = {
+	fromProjectRoot,
+	fromConfigRoot,
+	getAsBooleanFromENV,
+	getArgFromCLI,
+	getArgsFromCLI,
+	getFileArgsFromCLI,
+	getJestOverrideConfigFile,
+	getNodeArgsFromCLI,
+	getPackageProp,
+	getWebpackArgs,
+	getWordPressSrcDirectory,
+	getWebpackEntryPoints,
+	getRenderPropPaths,
+	getBlockJsonModuleFields,
+	getBlockJsonScriptFields,
+	hasArgInCLI,
+	hasBabelConfig,
+	hasCssnanoConfig,
+	hasFileArgInCLI,
+	hasJestConfig,
+	hasPackageProp,
+	hasPostCSSConfig,
+	hasPrettierConfig,
+	hasProjectFile,
+	spawnScript,
+};