♻️ refactor(HostedCart): resolve order ID once using `resolvedOrderId`

[acasazza]

Problem

In HostedCart.tsx, the pattern order?.id ?? orderId (where orderId comes from localStorage.getItem(persistKey)) was repeated multiple times across the useEffect, leading to duplication and reduced readability:

• order?.id == null && orderId == null
• order?.id != null || orderId != null
• orderId: order?.id ?? orderId
• orderId: order?.id ?? orderId ?? ""

Solution

Introduce a single resolvedOrderId variable at the top of the useEffect that merges both sources:

const resolvedOrderId = order?.id ?? localStorage.getItem(persistKey)

All subsequent null checks and usages then reference resolvedOrderId consistently, simplifying the conditions and removing the ?? "" fallback.