Ark: a Lightning invoice steps past a preimage index another device already spent.

The ASP answered "invoice has already been paid" for a point-of-sale
invoice: the receive counter on the phone was behind the one the laptop
had used. createLnInvoice now retries on that answer with the next index
(the counter only moves up; the key index is allocated once an invoice
exists), so the Receive tab, NWC make_invoice and the point of sale all
recover instead of failing.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Tmfg8k5f3TbNJS34qiqHAp

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