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/lighthouse/cli/run.d.ts

@@ -0,0 +1,24 @@
+export type ExitError = Error & {
+    code: string;
+    friendlyMessage?: string;
+};
+/**
+ * exported for testing
+ * @param {string|Array<string>} flags
+ * @return {Array<string>}
+ */
+export function parseChromeFlags(flags?: string | Array<string>): Array<string>;
+/**
+ * @param {LH.RunnerResult} runnerResult
+ * @param {LH.CliFlags} flags
+ * @return {Promise<void>}
+ */
+export function saveResults(runnerResult: LH.RunnerResult, flags: LH.CliFlags): Promise<void>;
+/**
+ * @param {string} url
+ * @param {LH.CliFlags} flags
+ * @param {LH.Config|undefined} config
+ * @return {Promise<LH.RunnerResult|undefined>}
+ */
+export function runLighthouse(url: string, flags: LH.CliFlags, config: LH.Config | undefined): Promise<LH.RunnerResult | undefined>;
+//# sourceMappingURL=run.d.ts.map