fix(ssr): right-size the pay modal; fix stale post-create title

The pay wizard modal was w-[50em] (800px) but its bank-account cards are
w-[30em] (480px), so once the CSS rebuild activated the real width it rendered
with a large empty right region — visible especially via the "Pay now" step
after creating an invoice. It had effectively been content-width (~543px) before
and looked fine. Set the pay modal to w-[34em] (544px) so it fits its content
and stays consistent across both pay steps. Verified live: modal is 544px and
the method cards fill it, centered.

Also fix the post-create "next steps" modal's stale header text
("Invoice accounts " -> "Invoice created").

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/clj/auto_ap/ssr/invoice/new_invoice_wizard.clj

@@ -675,7 +675,7 @@
    (com/modal {}
               (com/modal-card-advanced
                {:class "transition duration-300 ease-in-out scale-100 translate-x-0 opacity-100"}
-               (com/modal-header {} [:div.p-2 "Invoice accounts "])
+               (com/modal-header {} [:div.p-2 "Invoice created"])
                (com/modal-body
                 {}
                 [:p.text-lg "Would you like to pay this invoice now?"]