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/shared/tsconfig.json

@@ -0,0 +1,21 @@
+{
+  "extends": "../tsconfig-base.json",
+  "compilerOptions": {
+    // Limit defs to base JS.
+    "lib": ["es2020", "es2022.intl"],
+    // Only include `@types/node` from node_modules/.
+    "types": ["node"],
+    // "listFiles": true,
+  },
+  "references": [
+    {"path": "../types/lhr/"},
+  ],
+  "include": [
+    "**/*.js",
+    "types/**/*.d.ts",
+    "../esm-utils.js",
+  ],
+  "exclude": [
+    "test/**/*.js",
+  ],
+}