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/graphemer/lib/boundaries.d.ts

@@ -0,0 +1,35 @@
+/**
+ * The Grapheme_Cluster_Break property value
+ * @see https://www.unicode.org/reports/tr29/#Default_Grapheme_Cluster_Table
+ */
+export declare enum CLUSTER_BREAK {
+    CR = 0,
+    LF = 1,
+    CONTROL = 2,
+    EXTEND = 3,
+    REGIONAL_INDICATOR = 4,
+    SPACINGMARK = 5,
+    L = 6,
+    V = 7,
+    T = 8,
+    LV = 9,
+    LVT = 10,
+    OTHER = 11,
+    PREPEND = 12,
+    E_BASE = 13,
+    E_MODIFIER = 14,
+    ZWJ = 15,
+    GLUE_AFTER_ZWJ = 16,
+    E_BASE_GAZ = 17
+}
+/**
+ * The Emoji character property is an extension of UCD but shares the same namespace and structure
+ * @see http://www.unicode.org/reports/tr51/tr51-14.html#Emoji_Properties_and_Data_Files
+ *
+ * Here we model Extended_Pictograhpic only to implement UAX #29 GB11
+ * \p{Extended_Pictographic} Extend* ZWJ	×	\p{Extended_Pictographic}
+ *
+ * The Emoji character property should not be mixed with Grapheme_Cluster_Break since they are not exclusive
+ */
+export declare const EXTENDED_PICTOGRAPHIC = 101;
+//# sourceMappingURL=boundaries.d.ts.map