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/framer-motion/dist/es/projection/geometry/utils.mjs

@@ -0,0 +1,25 @@
+import { calcLength } from './delta-calc.mjs';
+
+function isAxisDeltaZero(delta) {
+    return delta.translate === 0 && delta.scale === 1;
+}
+function isDeltaZero(delta) {
+    return isAxisDeltaZero(delta.x) && isAxisDeltaZero(delta.y);
+}
+function boxEquals(a, b) {
+    return (a.x.min === b.x.min &&
+        a.x.max === b.x.max &&
+        a.y.min === b.y.min &&
+        a.y.max === b.y.max);
+}
+function boxEqualsRounded(a, b) {
+    return (Math.round(a.x.min) === Math.round(b.x.min) &&
+        Math.round(a.x.max) === Math.round(b.x.max) &&
+        Math.round(a.y.min) === Math.round(b.y.min) &&
+        Math.round(a.y.max) === Math.round(b.y.max));
+}
+function aspectRatio(box) {
+    return calcLength(box.x) / calcLength(box.y);
+}
+
+export { aspectRatio, boxEquals, boxEqualsRounded, isDeltaZero };