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/dedent/macro.js

@@ -0,0 +1,32 @@
+const { MacroError, createMacro } = require("babel-plugin-macros");
+const dedent = require("./dist/dedent.js").default;
+
+module.exports = createMacro(prevalMacros);
+
+function prevalMacros({ babel, references, state }) {
+	references.default.forEach((referencePath) => {
+		if (referencePath.parentPath.type === "TaggedTemplateExpression") {
+			asTag(referencePath.parentPath.get("quasi"), state, babel);
+		} else if (referencePath.parentPath.type === "CallExpression") {
+			asFunction(referencePath.parentPath.get("arguments"), state, babel);
+		} else {
+			throw new MacroError(
+				`dedent.macro can only be used as tagged template expression or function call. You tried ${referencePath.parentPath.type}.`,
+			);
+		}
+	});
+}
+
+function asTag(quasiPath, _, babel) {
+	const string = quasiPath.parentPath.get("quasi").evaluate().value;
+	const { types: t } = babel;
+
+	quasiPath.parentPath.replaceWith(t.stringLiteral(dedent(string)));
+}
+
+function asFunction(argumentsPaths, _, babel) {
+	const string = argumentsPaths[0].evaluate().value;
+	const { types: t } = babel;
+
+	argumentsPaths[0].parentPath.replaceWith(t.stringLiteral(dedent(string)));
+}