feat: add example

examples/demo-frontend/src/domains/cart/hooks/use-cart.hook.ts

@@ -0,0 +1,19 @@
+'use client'
+
+import { useContext } from 'react'
+
+import { CartContext } from '../cart.context'
+import type { CartContextValue } from '../types/cart.type'
+
+/**
+ * Возвращает application-scoped API корзины.
+ */
+export const useCart = (): CartContextValue => {
+  const context = useContext(CartContext)
+
+  if (context === null) {
+    throw new Error('useCart must be used inside CartProvider')
+  }
+
+  return context
+}