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/core-js/es/date/get-year.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/es.date.get-year');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('Date', 'getYear');

node_modules/core-js/es/date/index.js

@@ -0,0 +1,12 @@
+'use strict';
+require('../../modules/es.date.get-year');
+require('../../modules/es.date.now');
+require('../../modules/es.date.set-year');
+require('../../modules/es.date.to-gmt-string');
+require('../../modules/es.date.to-iso-string');
+require('../../modules/es.date.to-json');
+require('../../modules/es.date.to-string');
+require('../../modules/es.date.to-primitive');
+var path = require('../../internals/path');
+
+module.exports = path.Date;

node_modules/core-js/es/date/now.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/es.date.now');
+var path = require('../../internals/path');
+
+module.exports = path.Date.now;

node_modules/core-js/es/date/set-year.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/es.date.set-year');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('Date', 'setYear');

node_modules/core-js/es/date/to-gmt-string.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/es.date.to-gmt-string');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('Date', 'toGMTString');

node_modules/core-js/es/date/to-iso-string.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.date.to-iso-string');
+require('../../modules/es.date.to-json');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('Date', 'toISOString');

node_modules/core-js/es/date/to-json.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/es.date.to-json');
+var entryUnbind = require('../../internals/entry-unbind');
+
+module.exports = entryUnbind('Date', 'toJSON');

node_modules/core-js/es/date/to-primitive.js

@@ -0,0 +1,6 @@
+'use strict';
+require('../../modules/es.date.to-primitive');
+var uncurryThis = require('../../internals/function-uncurry-this');
+var toPrimitive = require('../../internals/date-to-primitive');
+
+module.exports = uncurryThis(toPrimitive);

node_modules/core-js/es/date/to-string.js

@@ -0,0 +1,5 @@
+'use strict';
+require('../../modules/es.date.to-string');
+var uncurryThis = require('../../internals/function-uncurry-this');
+
+module.exports = uncurryThis(Date.prototype.toString);