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/@babel/compat-data/data/overlapping-plugins.json

@@ -0,0 +1,35 @@
+{
+  "transform-async-to-generator": [
+    "bugfix/transform-async-arrows-in-class"
+  ],
+  "transform-parameters": [
+    "bugfix/transform-edge-default-parameters",
+    "bugfix/transform-safari-id-destructuring-collision-in-function-expression"
+  ],
+  "transform-function-name": [
+    "bugfix/transform-edge-function-name"
+  ],
+  "transform-block-scoping": [
+    "bugfix/transform-safari-block-shadowing",
+    "bugfix/transform-safari-for-shadowing"
+  ],
+  "transform-template-literals": [
+    "bugfix/transform-tagged-template-caching"
+  ],
+  "transform-optional-chaining": [
+    "bugfix/transform-v8-spread-parameters-in-optional-chaining"
+  ],
+  "proposal-optional-chaining": [
+    "bugfix/transform-v8-spread-parameters-in-optional-chaining"
+  ],
+  "transform-class-properties": [
+    "bugfix/transform-v8-static-class-fields-redefine-readonly",
+    "bugfix/transform-firefox-class-in-computed-class-key",
+    "bugfix/transform-safari-class-field-initializer-scope"
+  ],
+  "proposal-class-properties": [
+    "bugfix/transform-v8-static-class-fields-redefine-readonly",
+    "bugfix/transform-firefox-class-in-computed-class-key",
+    "bugfix/transform-safari-class-field-initializer-scope"
+  ]
+}