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/components/build/disabled/styles/disabled-styles.js

@@ -0,0 +1,19 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.disabledStyles = void 0;
+var _react = require("@emotion/react");
+function _EMOTION_STRINGIFIED_CSS_ERROR__() { return "You have tried to stringify object returned from `css` function. It isn't supposed to be used directly (e.g. as value of the `className` prop), but rather handed to emotion so it can handle it (e.g. as value of `css` prop)."; }
+const disabledStyles = process.env.NODE_ENV === "production" ? {
+  name: "u2jump",
+  styles: "position:relative;pointer-events:none;&::after{content:'';position:absolute;top:0;right:0;bottom:0;left:0;}*{pointer-events:none;}"
+} : {
+  name: "iqemdn-disabledStyles",
+  styles: "position:relative;pointer-events:none;&::after{content:'';position:absolute;top:0;right:0;bottom:0;left:0;}*{pointer-events:none;};label:disabledStyles;",
+  map: "/*# sourceMappingURL=data:application/json;charset=utf-8;base64,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 */",
+  toString: _EMOTION_STRINGIFIED_CSS_ERROR__
+};
+exports.disabledStyles = disabledStyles;
+//# sourceMappingURL=disabled-styles.js.map

node_modules/@wordpress/components/build/disabled/styles/disabled-styles.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["_react","require","_EMOTION_STRINGIFIED_CSS_ERROR__","disabledStyles","process","env","NODE_ENV","name","styles","map","toString","exports"],"sources":["@wordpress/components/src/disabled/styles/disabled-styles.tsx"],"sourcesContent":["/**\n * External dependencies\n */\nimport { css } from '@emotion/react';\n\nexport const disabledStyles = css`\n\tposition: relative;\n\tpointer-events: none;\n\n\t&::after {\n\t\tcontent: '';\n\t\tposition: absolute;\n\t\ttop: 0;\n\t\tright: 0;\n\t\tbottom: 0;\n\t\tleft: 0;\n\t}\n\n\t// Also make nested blocks unselectable.\n\t* {\n\t\tpointer-events: none;\n\t}\n`;\n"],"mappings":";;;;;;AAGA,IAAAA,MAAA,GAAAC,OAAA;AAAqC,SAAAC,iCAAA;AAE9B,MAAMC,cAAc,GAAAC,OAAA,CAAAC,GAAA,CAAAC,QAAA;EAAAC,IAAA;EAAAC,MAAA;AAAA;EAAAD,IAAA;EAAAC,MAAA;EAAAC,GAAA;EAAAC,QAAA,EAAAR;AAAA,CAiB1B;AAACS,OAAA,CAAAR,cAAA,GAAAA,cAAA"}