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/date-fns/locale/_lib/buildFormatLongFn/index.js

@@ -0,0 +1,16 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = buildFormatLongFn;
+function buildFormatLongFn(args) {
+  return function () {
+    var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+    // TODO: Remove String()
+    var width = options.width ? String(options.width) : args.defaultWidth;
+    var format = args.formats[width] || args.formats[args.defaultWidth];
+    return format;
+  };
+}
+module.exports = exports.default;

node_modules/date-fns/locale/_lib/buildLocalizeFn/index.js

@@ -0,0 +1,25 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = buildLocalizeFn;
+function buildLocalizeFn(args) {
+  return function (dirtyIndex, options) {
+    var context = options !== null && options !== void 0 && options.context ? String(options.context) : 'standalone';
+    var valuesArray;
+    if (context === 'formatting' && args.formattingValues) {
+      var defaultWidth = args.defaultFormattingWidth || args.defaultWidth;
+      var width = options !== null && options !== void 0 && options.width ? String(options.width) : defaultWidth;
+      valuesArray = args.formattingValues[width] || args.formattingValues[defaultWidth];
+    } else {
+      var _defaultWidth = args.defaultWidth;
+      var _width = options !== null && options !== void 0 && options.width ? String(options.width) : args.defaultWidth;
+      valuesArray = args.values[_width] || args.values[_defaultWidth];
+    }
+    var index = args.argumentCallback ? args.argumentCallback(dirtyIndex) : dirtyIndex;
+    // @ts-ignore: For some reason TypeScript just don't want to match it, no matter how hard we try. I challenge you to try to remove it!
+    return valuesArray[index];
+  };
+}
+module.exports = exports.default;

node_modules/date-fns/locale/_lib/buildMatchFn/index.js

@@ -0,0 +1,49 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = buildMatchFn;
+function buildMatchFn(args) {
+  return function (string) {
+    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+    var width = options.width;
+    var matchPattern = width && args.matchPatterns[width] || args.matchPatterns[args.defaultMatchWidth];
+    var matchResult = string.match(matchPattern);
+    if (!matchResult) {
+      return null;
+    }
+    var matchedString = matchResult[0];
+    var parsePatterns = width && args.parsePatterns[width] || args.parsePatterns[args.defaultParseWidth];
+    var key = Array.isArray(parsePatterns) ? findIndex(parsePatterns, function (pattern) {
+      return pattern.test(matchedString);
+    }) : findKey(parsePatterns, function (pattern) {
+      return pattern.test(matchedString);
+    });
+    var value;
+    value = args.valueCallback ? args.valueCallback(key) : key;
+    value = options.valueCallback ? options.valueCallback(value) : value;
+    var rest = string.slice(matchedString.length);
+    return {
+      value: value,
+      rest: rest
+    };
+  };
+}
+function findKey(object, predicate) {
+  for (var key in object) {
+    if (object.hasOwnProperty(key) && predicate(object[key])) {
+      return key;
+    }
+  }
+  return undefined;
+}
+function findIndex(array, predicate) {
+  for (var key = 0; key < array.length; key++) {
+    if (predicate(array[key])) {
+      return key;
+    }
+  }
+  return undefined;
+}
+module.exports = exports.default;

node_modules/date-fns/locale/_lib/buildMatchPatternFn/index.js

@@ -0,0 +1,24 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = buildMatchPatternFn;
+function buildMatchPatternFn(args) {
+  return function (string) {
+    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+    var matchResult = string.match(args.matchPattern);
+    if (!matchResult) return null;
+    var matchedString = matchResult[0];
+    var parseResult = string.match(args.parsePattern);
+    if (!parseResult) return null;
+    var value = args.valueCallback ? args.valueCallback(parseResult[0]) : parseResult[0];
+    value = options.valueCallback ? options.valueCallback(value) : value;
+    var rest = string.slice(matchedString.length);
+    return {
+      value: value,
+      rest: rest
+    };
+  };
+}
+module.exports = exports.default;