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-module/mobile/clipboard/index.native.js

@@ -0,0 +1,17 @@
+const createClipboard = () => {
+  let currentClipboard;
+  const setClipboard = clipboard => {
+    currentClipboard = clipboard;
+  };
+  const getClipboard = () => currentClipboard;
+  return {
+    setClipboard,
+    getClipboard
+  };
+};
+const clipboard = createClipboard();
+export const {
+  setClipboard,
+  getClipboard
+} = clipboard;
+//# sourceMappingURL=index.native.js.map

node_modules/@wordpress/components/build-module/mobile/clipboard/index.native.js.map

@@ -0,0 +1 @@
+{"version":3,"names":["createClipboard","currentClipboard","setClipboard","clipboard","getClipboard"],"sources":["@wordpress/components/src/mobile/clipboard/index.native.js"],"sourcesContent":["const createClipboard = () => {\n\tlet currentClipboard;\n\n\tconst setClipboard = ( clipboard ) => {\n\t\tcurrentClipboard = clipboard;\n\t};\n\n\tconst getClipboard = () => currentClipboard;\n\n\treturn {\n\t\tsetClipboard,\n\t\tgetClipboard,\n\t};\n};\n\nconst clipboard = createClipboard();\n\nexport const { setClipboard, getClipboard } = clipboard;\n"],"mappings":"AAAA,MAAMA,eAAe,GAAGA,CAAA,KAAM;EAC7B,IAAIC,gBAAgB;EAEpB,MAAMC,YAAY,GAAKC,SAAS,IAAM;IACrCF,gBAAgB,GAAGE,SAAS;EAC7B,CAAC;EAED,MAAMC,YAAY,GAAGA,CAAA,KAAMH,gBAAgB;EAE3C,OAAO;IACNC,YAAY;IACZE;EACD,CAAC;AACF,CAAC;AAED,MAAMD,SAAS,GAAGH,eAAe,CAAC,CAAC;AAEnC,OAAO,MAAM;EAAEE,YAAY;EAAEE;AAAa,CAAC,GAAGD,SAAS"}