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/stylelint/lib/rules/selector-descendant-combinator-no-non-space/index.js

@@ -0,0 +1,94 @@
+'use strict';
+
+const isStandardSyntaxRule = require('../../utils/isStandardSyntaxRule');
+const parseSelector = require('../../utils/parseSelector');
+const report = require('../../utils/report');
+const ruleMessages = require('../../utils/ruleMessages');
+const validateOptions = require('../../utils/validateOptions');
+
+const ruleName = 'selector-descendant-combinator-no-non-space';
+
+const messages = ruleMessages(ruleName, {
+	rejected: (nonSpaceCharacter) => `Unexpected "${nonSpaceCharacter}"`,
+});
+
+const meta = {
+	url: 'https://stylelint.io/user-guide/rules/selector-descendant-combinator-no-non-space',
+	fixable: true,
+};
+
+/** @type {import('stylelint').Rule} */
+const rule = (primary, _secondaryOptions, context) => {
+	return (root, result) => {
+		const validOptions = validateOptions(result, ruleName, {
+			actual: primary,
+		});
+
+		if (!validOptions) {
+			return;
+		}
+
+		root.walkRules((ruleNode) => {
+			if (!isStandardSyntaxRule(ruleNode)) {
+				return;
+			}
+
+			let hasFixed = false;
+			const selector = ruleNode.raws.selector ? ruleNode.raws.selector.raw : ruleNode.selector;
+
+			// Return early for selectors containing comments
+			// TODO: renable when parser and stylelint are compatible
+			if (selector.includes('/*')) return;
+
+			const fixedSelector = parseSelector(selector, result, ruleNode, (fullSelector) => {
+				fullSelector.walkCombinators((combinatorNode) => {
+					if (combinatorNode.value !== ' ') {
+						return;
+					}
+
+					const value = combinatorNode.toString();
+
+					if (
+						value.includes('  ') ||
+						value.includes('\t') ||
+						value.includes('\n') ||
+						value.includes('\r')
+					) {
+						if (context.fix && /^\s+$/.test(value)) {
+							hasFixed = true;
+
+							if (!combinatorNode.raws) combinatorNode.raws = {};
+
+							combinatorNode.raws.value = ' ';
+							combinatorNode.rawSpaceBefore = combinatorNode.rawSpaceBefore.replace(/^\s+/, '');
+							combinatorNode.rawSpaceAfter = combinatorNode.rawSpaceAfter.replace(/\s+$/, '');
+
+							return;
+						}
+
+						report({
+							result,
+							ruleName,
+							message: messages.rejected(value),
+							node: ruleNode,
+							index: combinatorNode.sourceIndex,
+						});
+					}
+				});
+			});
+
+			if (hasFixed && fixedSelector) {
+				if (!ruleNode.raws.selector) {
+					ruleNode.selector = fixedSelector;
+				} else {
+					ruleNode.raws.selector.raw = fixedSelector;
+				}
+			}
+		});
+	};
+};
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+rule.meta = meta;
+module.exports = rule;