Initial commit

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01F22Ms5Cxam5UHyxaCrtZzu

lib/cart.ts

@@ -0,0 +1,11 @@
+import { createCartComponents } from "@shopify/hydrogen/react";
+
+import type { cartHandlers } from "./cart-handlers";
+
+/**
+ * React cart bindings derived from the cart server handlers' type. The
+ * `CartProvider` accepts the full handler data envelope (`{cart, errors?}`) as
+ * `initialData` — see `hydrogen-cart-ui` / `references/react.md`. Do not unwrap
+ * to `data.cart`: `{cart: null}` tells the client the server already checked.
+ */
+export const { CartProvider, useCart, useCartForm } = createCartComponents<typeof cartHandlers>();