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/deprecated/build-module/index.js

@@ -0,0 +1,84 @@
+/**
+ * WordPress dependencies
+ */
+import { doAction } from '@wordpress/hooks';
+
+/**
+ * Object map tracking messages which have been logged, for use in ensuring a
+ * message is only logged once.
+ *
+ * @type {Record<string, true | undefined>}
+ */
+export const logged = Object.create(null);
+
+/**
+ * Logs a message to notify developers about a deprecated feature.
+ *
+ * @param {string} feature               Name of the deprecated feature.
+ * @param {Object} [options]             Personalisation options
+ * @param {string} [options.since]       Version in which the feature was deprecated.
+ * @param {string} [options.version]     Version in which the feature will be removed.
+ * @param {string} [options.alternative] Feature to use instead
+ * @param {string} [options.plugin]      Plugin name if it's a plugin feature
+ * @param {string} [options.link]        Link to documentation
+ * @param {string} [options.hint]        Additional message to help transition away from the deprecated feature.
+ *
+ * @example
+ * ```js
+ * import deprecated from '@wordpress/deprecated';
+ *
+ * deprecated( 'Eating meat', {
+ * 	since: '2019.01.01'
+ * 	version: '2020.01.01',
+ * 	alternative: 'vegetables',
+ * 	plugin: 'the earth',
+ * 	hint: 'You may find it beneficial to transition gradually.',
+ * } );
+ *
+ * // Logs: 'Eating meat is deprecated since version 2019.01.01 and will be removed from the earth in version 2020.01.01. Please use vegetables instead. Note: You may find it beneficial to transition gradually.'
+ * ```
+ */
+export default function deprecated(feature, options = {}) {
+  const {
+    since,
+    version,
+    alternative,
+    plugin,
+    link,
+    hint
+  } = options;
+  const pluginMessage = plugin ? ` from ${plugin}` : '';
+  const sinceMessage = since ? ` since version ${since}` : '';
+  const versionMessage = version ? ` and will be removed${pluginMessage} in version ${version}` : '';
+  const useInsteadMessage = alternative ? ` Please use ${alternative} instead.` : '';
+  const linkMessage = link ? ` See: ${link}` : '';
+  const hintMessage = hint ? ` Note: ${hint}` : '';
+  const message = `${feature} is deprecated${sinceMessage}${versionMessage}.${useInsteadMessage}${linkMessage}${hintMessage}`;
+
+  // Skip if already logged.
+  if (message in logged) {
+    return;
+  }
+
+  /**
+   * Fires whenever a deprecated feature is encountered
+   *
+   * @param {string}  feature             Name of the deprecated feature.
+   * @param {?Object} options             Personalisation options
+   * @param {string}  options.since       Version in which the feature was deprecated.
+   * @param {?string} options.version     Version in which the feature will be removed.
+   * @param {?string} options.alternative Feature to use instead
+   * @param {?string} options.plugin      Plugin name if it's a plugin feature
+   * @param {?string} options.link        Link to documentation
+   * @param {?string} options.hint        Additional message to help transition away from the deprecated feature.
+   * @param {?string} message             Message sent to console.warn
+   */
+  doAction('deprecated', feature, options, message);
+
+  // eslint-disable-next-line no-console
+  console.warn(message);
+  logged[message] = true;
+}
+
+/** @typedef {import('utility-types').NonUndefined<Parameters<typeof deprecated>[1]>} DeprecatedOptions */
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/deprecated/build-module/index.js.map

@@ -0,0 +1 @@
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