Add guest cart drawer, Continue handoff, and shared customer login.

Co-authored-by: Cursor <cursoragent@cursor.com>

Ai-data/prompt-cart.txt

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+Build storefront cart UI + Continue handoff + shared customer login for this Meshkee website.
+## Remote only
+- Production Meshkee API and live site only — no localhost / local ports.
+- Customer app: https://customer.<WEBSITE_DOMAIN>
+- Business app: https://business.<WEBSITE_DOMAIN>
+Production env:
+NEXT_PUBLIC_API_BASE_URL=https://api.meshkee.com/api/v1
+NEXT_PUBLIC_DOMAIN=<WEBSITE_DOMAIN>
+NEXT_PUBLIC_CUSTOMER_ORIGIN=https://customer.<WEBSITE_DOMAIN>
+NEXT_PUBLIC_BUSINESS_ORIGIN=https://business.<WEBSITE_DOMAIN>
+
+
+## Scope
+Website only. Do not rebuild customer checkout, payment, addresses, or account pages — those are global on customer.<WEBSITE_DOMAIN>.
+
+
+## Cart UI
+- Header cart icon + count badge
+- Popup/drawer: lines, quantity, remove, total, Continue
+- Cart lines use store item variant id (not product id)
+- Guest cart: localStorage key meshkee-guest-cart + cookie on .<WEBSITE_DOMAIN>
+- Guest line: { id, name, slug?, price, quantity, image? } (id = variant id)
+
+
+## Continue
+- Logged in → customer.<WEBSITE_DOMAIN>/checkout/cart#guestCart=<base64url JSON>
+- Guest → customer.<WEBSITE_DOMAIN>/login?redirect=/checkout/cart#guestCart=<base64url JSON>
+- If no guest lines left, open /checkout/cart without the hash
+
+
+## Shared session
+- Cookies: meshkee_customer_access_token / meshkee_customer_refresh_token on .<WEBSITE_DOMAIN> (SameSite=Lax; chunk large tokens)
+- Hydrate site session from those cookies
+- ورود → customer login with redirect=/
+- Logged in: "{firstName} عزیز" menu → profile, orders, logout; “مدیریت وبسایت” only for site admins → business app (handoff when available)
+Match existing site design. Keep the change limited to cart popup, Continue handoff, and header auth.