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/eslint-plugin-jest/docs/rules/no-interpolation-in-snapshots.md

@@ -0,0 +1,65 @@
+# Disallow string interpolation inside snapshots (`no-interpolation-in-snapshots`)
+
+💼 This rule is enabled in the ✅ `recommended`
+[config](https://github.com/jest-community/eslint-plugin-jest/blob/main/README.md#shareable-configurations).
+
+<!-- end auto-generated rule header -->
+
+Prevents the use of string interpolations in snapshots.
+
+## Rule details
+
+Interpolation prevents snapshots from being updated. Instead, properties should
+be overloaded with a matcher by using
+[property matchers](https://jestjs.io/docs/en/snapshot-testing#property-matchers).
+
+Examples of **incorrect** code for this rule:
+
+```js
+expect(something).toMatchInlineSnapshot(
+  `Object {
+    property: ${interpolated}
+  }`,
+);
+
+expect(something).toMatchInlineSnapshot(
+  { other: expect.any(Number) },
+  `Object {
+    other: Any<Number>,
+    property: ${interpolated}
+  }`,
+);
+
+expect(errorThrowingFunction).toThrowErrorMatchingInlineSnapshot(
+  `${interpolated}`,
+);
+```
+
+Examples of **correct** code for this rule:
+
+```js
+expect(something).toMatchInlineSnapshot();
+
+expect(something).toMatchInlineSnapshot(
+  `Object {
+    property: 1
+  }`,
+);
+
+expect(something).toMatchInlineSnapshot(
+  { property: expect.any(Date) },
+  `Object {
+    property: Any<Date>
+  }`,
+);
+
+expect(errorThrowingFunction).toThrowErrorMatchingInlineSnapshot();
+
+expect(errorThrowingFunction).toThrowErrorMatchingInlineSnapshot(
+  `Error Message`,
+);
+```
+
+## When Not To Use It
+
+Don't use this rule on non-jest test files.