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/@wordpress/primitives/src/block-quotation/README.md

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+# Block Quotation
+
+A drop-in replacement for the HTML [blockquote](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/blockquote) element that works both on the web and in the mobile apps. It indicates that the enclosed text is an extended quotation.
+
+## Usage
+
+```jsx
+import { BlockQuotation } from '@wordpress/components';
+
+const MyBlockQuotation = () => (
+	<BlockQuotation>...Quote content</BlockQuotation>
+);
+```

node_modules/@wordpress/primitives/src/block-quotation/index.js

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+export const BlockQuotation = 'blockquote';

node_modules/@wordpress/primitives/src/block-quotation/index.native.js

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+/**
+ * External dependencies
+ */
+import { View } from 'react-native';
+/**
+ * WordPress dependencies
+ */
+import { Children, cloneElement, forwardRef } from '@wordpress/element';
+import { usePreferredColorSchemeStyle } from '@wordpress/compose';
+/**
+ * Internal dependencies
+ */
+import styles from './style.scss';
+
+export const BlockQuotation = forwardRef( ( { ...props }, ref ) => {
+	const { style } = props;
+
+	const blockQuoteStyle = [
+		usePreferredColorSchemeStyle(
+			styles.wpBlockQuoteLight,
+			styles.wpBlockQuoteDark
+		),
+		style?.baseColors?.color?.text && {
+			borderLeftColor: style.baseColors.color.text,
+		},
+		style?.color && {
+			borderLeftColor: style.color,
+		},
+		style,
+		style?.backgroundColor && styles.paddingWithBackground,
+	];
+	const colorStyle = style?.color ? { color: style.color } : {};
+
+	const newChildren = Children.map( props.children, ( child ) => {
+		const { identifier, attributeKey } = child?.props || {};
+		const identifierKey = identifier ?? attributeKey;
+
+		if ( identifierKey === 'citation' ) {
+			return cloneElement( child, {
+				style: {
+					...styles.wpBlockQuoteCitation,
+					...colorStyle,
+				},
+			} );
+		}
+		if ( child && child.props.identifier === 'value' ) {
+			return cloneElement( child, {
+				tagsToEliminate: [ 'div' ],
+				style: colorStyle,
+			} );
+		}
+		return child;
+	} );
+	return (
+		<View ref={ ref } style={ blockQuoteStyle }>
+			{ newChildren }
+		</View>
+	);
+} );

node_modules/@wordpress/primitives/src/block-quotation/style.native.scss

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+%wpBlockQuote-shared {
+	border-left-width: 4px;
+	border-left-style: solid;
+	padding-left: $block-edge-to-content;
+	margin-left: 0;
+}
+
+.wpBlockQuoteLight {
+	@extend %wpBlockQuote-shared;
+	border-left-color: $black;
+}
+
+.wpBlockQuoteDark {
+	@extend %wpBlockQuote-shared;
+	border-left-color: $white;
+}
+
+.wpBlockQuoteCitation {
+	margin-top: 16px;
+	font-size: 14px;
+}
+
+.paddingWithBackground {
+	padding-top: $block-edge-to-content - $block-selected-margin;
+}