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/e2e-test-utils-playwright/build/lighthouse/index.js

@@ -0,0 +1,58 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Lighthouse = void 0;
+const lighthouse = require("lighthouse/core/index.cjs");
+class Lighthouse {
+    page;
+    port;
+    constructor({ page, port }) {
+        this.page = page;
+        this.port = port;
+    }
+    /**
+     * Returns the Lighthouse report for the current URL.
+     *
+     * Runs several Lighthouse audits in a separate browser window and returns
+     * the summary.
+     */
+    async getReport() {
+        // From https://github.com/GoogleChrome/lighthouse/blob/d149e9c1b628d5881ca9ca451278d99ff1b31d9a/core/config/default-config.js#L433-L503
+        const audits = {
+            'largest-contentful-paint': 'LCP',
+            'total-blocking-time': 'TBT',
+            interactive: 'TTI',
+            'cumulative-layout-shift': 'CLS',
+            'experimental-interaction-to-next-paint': 'INP',
+        };
+        const report = await lighthouse(this.page.url(), { port: this.port }, {
+            extends: 'lighthouse:default',
+            settings: {
+                // "provided" means no throttling.
+                // TODO: Make configurable.
+                throttlingMethod: 'provided',
+                // Default is "mobile".
+                // See https://github.com/GoogleChrome/lighthouse/blob/main/docs/emulation.md
+                // TODO: Make configurable.
+                formFactor: 'desktop',
+                screenEmulation: {
+                    disabled: true,
+                },
+                // Speeds up the report.
+                disableFullPageScreenshot: true,
+                // Only run certain audits to speed things up.
+                onlyAudits: Object.keys(audits),
+            },
+        });
+        const result = {};
+        if (!report) {
+            return result;
+        }
+        const { lhr } = report;
+        for (const [audit, acronym] of Object.entries(audits)) {
+            result[acronym] = lhr.audits[audit]?.numericValue || 0;
+        }
+        return result;
+    }
+}
+exports.Lighthouse = Lighthouse;
+//# sourceMappingURL=index.js.map

node_modules/@wordpress/e2e-test-utils-playwright/build/lighthouse/index.js.map

@@ -0,0 +1 @@
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