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/@sentry/utils/dist/string.d.ts

@@ -0,0 +1,43 @@
+/**
+ * Truncates given string to the maximum characters count
+ *
+ * @param str An object that contains serializable values
+ * @param max Maximum number of characters in truncated string (0 = unlimited)
+ * @returns string Encoded
+ */
+export declare function truncate(str: string, max?: number): string;
+/**
+ * This is basically just `trim_line` from
+ * https://github.com/getsentry/sentry/blob/master/src/sentry/lang/javascript/processor.py#L67
+ *
+ * @param str An object that contains serializable values
+ * @param max Maximum number of characters in truncated string
+ * @returns string Encoded
+ */
+export declare function snipLine(line: string, colno: number): string;
+/**
+ * Join values in array
+ * @param input array of values to be joined together
+ * @param delimiter string to be placed in-between values
+ * @returns Joined values
+ */
+export declare function safeJoin(input: any[], delimiter?: string): string;
+/**
+ * Checks if the value matches a regex or includes the string
+ * @param value The string value to be checked against
+ * @param pattern Either a regex or a string that must be contained in value
+ */
+export declare function isMatchingPattern(value: string, pattern: RegExp | string): boolean;
+/**
+ * Given a string, escape characters which have meaning in the regex grammar, such that the result is safe to feed to
+ * `new RegExp()`.
+ *
+ * Based on https://github.com/sindresorhus/escape-string-regexp. Vendored to a) reduce the size by skipping the runtime
+ * type-checking, and b) ensure it gets down-compiled for old versions of Node (the published package only supports Node
+ * 12+).
+ *
+ * @param regexString The string to escape
+ * @returns An version of the string with all special regex characters escaped
+ */
+export declare function escapeStringForRegex(regexString: string): string;
+//# sourceMappingURL=string.d.ts.map