Add customer accounts: login, signup, reset, activate, orders

- Storefront customer operations in graphql/customer.js and a server-safe
  services/shopify/customer.ts
- Session held in an httpOnly, sameSite=lax cookie set by the
  /api/account handlers; the access token never reaches client JS
- Pages: /account/login, /register, /recover, /reset/[id]/[token] and
  /activate/[id]/[token] for Shopify's emailed links
- /account renders order history as master-detail on one screen, since
  the Storefront API has no standalone order-by-id query for customers
- Header user icon: links to sign-in when signed out, otherwise a menu
  with name, email, order history, and sign out
- Login errors are collapsed and password recovery responds identically
  for known and unknown emails, so neither form enumerates accounts

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016jWbNNJLksC1QG8z8845FX

app/account/page.tsx

@@ -0,0 +1,38 @@
+import { redirect } from 'next/navigation';
+import Header from '@/components/shopify/header';
+import Footer from '@/components/shopify/footer';
+import OrderHistory from '@/components/shopify/order-history';
+import { getSessionToken } from '@/services/shopify/session';
+import { getCustomer } from '@/services/shopify/customer';
+
+export const metadata = { title: 'Order history — Shop' };
+
+export default async function Page() {
+  const token = await getSessionToken();
+  if (!token) redirect('/account/login');
+
+  const customer = await getCustomer(token, 20);
+  // An expired or revoked token reads as signed out.
+  if (!customer) redirect('/account/login');
+
+  return (
+    <>
+      <Header storeName="Shop" logoUrl="" />
+
+      <main className="max-w-screen-2xl mx-auto w-full px-8 py-12">
+        <h1 className="text-2xl md:text-3xl font-normal text-foreground">
+          Order history
+        </h1>
+        <p className="mt-1 text-sm text-muted-foreground">
+          {customer.displayName} · {customer.email}
+        </p>
+
+        <div className="mt-10">
+          <OrderHistory customer={customer} />
+        </div>
+      </main>
+
+      <Footer storeName="Shop" copyright="© 2026 Shop. All rights reserved." />
+    </>
+  );
+}