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/eslint-plugin/utils/get-translate-function-args.js

@@ -0,0 +1,40 @@
+/**
+ * Given a function name and array of argument Node values,
+ * returns all arguments except for text domain and number arguments.
+ *
+ * @param {string}        functionName   Function name.
+ * @param {espree.Node[]} args           Espree argument Node objects.
+ * @param {boolean}       includeContext Whether to include the context argument or not.
+ *
+ * @return {espree.Node[]} Translate function arguments.
+ */
+function getTranslateFunctionArgs( functionName, args, includeContext = true ) {
+	switch ( functionName ) {
+		case '__':
+			// __( text, domain ) -> [ text ].
+			return args.slice( 0, 1 );
+
+		case '_x':
+			// _x( text, context, domain ) -> [ text, context ].
+			return includeContext ? args.slice( 0, 2 ) : args.slice( 0, 1 );
+
+		case '_n':
+			// _n( single, plural, number, domain ) -> [ single, plural ].
+			return args.slice( 0, 2 );
+
+		case '_nx':
+			// _nx( single, plural, number, context, domain ) -> [ single, plural, context ].
+			const result = args.slice( 0, 2 );
+			if ( includeContext ) {
+				result.push( args[ 3 ] );
+			}
+			return result;
+
+		default:
+			return [];
+	}
+}
+
+module.exports = {
+	getTranslateFunctionArgs,
+};