fix(ecash): stop Minibits LN-address claims from being silently lost

A Minibits /claim response consumes the payment server-side the instant
it's returned — it can never be re-fetched. claim_and_redeem previously
decrypted/redeemed each claim inline and just warn!-logged any failure,
so a mint-unreachable blip, a stale cached server key, or an operator
who'd edited their accepted-mints list to drop the default mint (via
streaming.configure-mints) could make a real payment vanish with
nothing but a log line to show for it — claimed_count/received_sats
still came back as a clean 0, identical to "nothing arrived."

Now: every fetched claim is persisted to MinibitsState.pending_claims
before decrypt/redeem is attempted, survives failures across polls
instead of being dropped, and claim_and_redeem no longer bails out on a
fetch error without first retrying whatever was already pending.
ensure_mint_accepted self-heals the accepted-mints allow-list so the
Minibits mint (the address is inherently backed by it) can't be
excluded out from under a claim. ClaimOutcome gains failed_count,
threaded through wallet.ecash-lnaddress-claim and shown in
ReceiveBitcoinModal so a stuck claim is visible instead of silent.

Also fixes the server_nostur_pubkey field-name typo (no live state to
migrate — this feature hasn't shipped yet).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EawZPP9iidXj6Tvg3EpG3a

neode-ui/src/locales/es.json

@@ -762,6 +762,7 @@
     "lnAddressLoading": "Configurando su direcci\u00f3n Lightning\u2026",
     "lnAddressUnavailable": "Direcci\u00f3n Lightning no disponible \u2014 a\u00fan puede pegar un token abajo.",
     "lnAddressReceived": "\u00a1Recibi\u00f3 {amount} sats en su direcci\u00f3n Lightning!",
+    "lnAddressPendingRetry": "Lleg\u00f3 un pago pero a\u00fan no se pudo canjear ({count}) \u2014 reintentando autom\u00e1ticamente, mantenga esta pantalla abierta.",
     "processing": "Procesando...",
     "generateAddress": "Generar direcci\u00f3n",
     "createInvoice": "Crear factura",