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/api-fetch/build/utils/response.js

@@ -0,0 +1,83 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.parseAndThrowError = parseAndThrowError;
+exports.parseResponseAndNormalizeError = void 0;
+var _i18n = require("@wordpress/i18n");
+/**
+ * WordPress dependencies
+ */
+
+/**
+ * Parses the apiFetch response.
+ *
+ * @param {Response} response
+ * @param {boolean}  shouldParseResponse
+ *
+ * @return {Promise<any> | null | Response} Parsed response.
+ */
+const parseResponse = (response, shouldParseResponse = true) => {
+  if (shouldParseResponse) {
+    if (response.status === 204) {
+      return null;
+    }
+    return response.json ? response.json() : Promise.reject(response);
+  }
+  return response;
+};
+
+/**
+ * Calls the `json` function on the Response, throwing an error if the response
+ * doesn't have a json function or if parsing the json itself fails.
+ *
+ * @param {Response} response
+ * @return {Promise<any>} Parsed response.
+ */
+const parseJsonAndNormalizeError = response => {
+  const invalidJsonError = {
+    code: 'invalid_json',
+    message: (0, _i18n.__)('The response is not a valid JSON response.')
+  };
+  if (!response || !response.json) {
+    throw invalidJsonError;
+  }
+  return response.json().catch(() => {
+    throw invalidJsonError;
+  });
+};
+
+/**
+ * Parses the apiFetch response properly and normalize response errors.
+ *
+ * @param {Response} response
+ * @param {boolean}  shouldParseResponse
+ *
+ * @return {Promise<any>} Parsed response.
+ */
+const parseResponseAndNormalizeError = (response, shouldParseResponse = true) => {
+  return Promise.resolve(parseResponse(response, shouldParseResponse)).catch(res => parseAndThrowError(res, shouldParseResponse));
+};
+
+/**
+ * Parses a response, throwing an error if parsing the response fails.
+ *
+ * @param {Response} response
+ * @param {boolean}  shouldParseResponse
+ * @return {Promise<any>} Parsed response.
+ */
+exports.parseResponseAndNormalizeError = parseResponseAndNormalizeError;
+function parseAndThrowError(response, shouldParseResponse = true) {
+  if (!shouldParseResponse) {
+    throw response;
+  }
+  return parseJsonAndNormalizeError(response).then(error => {
+    const unknownError = {
+      code: 'unknown_error',
+      message: (0, _i18n.__)('An unknown error occurred.')
+    };
+    throw error || unknownError;
+  });
+}
+//# sourceMappingURL=response.js.map

node_modules/@wordpress/api-fetch/build/utils/response.js.map

@@ -0,0 +1 @@
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