Same class of bug as the earlier matching-cascade fix: selectedCustomerAddress
is resolved asynchronously against the address book and can lag behind or
mismatch. appState.address.display is set synchronously the moment the user
picks an address (AddressesView.selectAddress) — it's the authoritative live
value. customerAddressName had these backwards, checking the async value
first.
CheckoutView.swift's addressSection showed the literal string "Casa"
as the address name/label regardless of which address was actually
selected — only the street/detail line below it (customerAddressLabel)
was wired to real state. Added customerAddressName, preferring
selectedCustomerAddress?.label then appState.address.display, matching
the same fallback pattern already used for the detail line.
