Send: pay a pasted Lightning invoice via an auto submarine swap (itemized cost)

Paste a bolt11 into the normal Send recipient field and Review now detects it and
routes through a Boltz submarine swap — no 'swap' concept surfaced. Split
startSubmarine into quoteSubmarine (POST + build-but-don't-broadcast the funding
tx) and fundQuotedSubmarine, so the review shows an itemized cost before
committing: Amount + Boltz fee + on-chain network fee = Total. Pay funds the
lockup; Boltz pays the invoice once it confirms.

Verified on regtest: a 60,000-sat invoice quotes to Amount 60,000 / Boltz 362 /
network 442 / Total 60,804, with a Pay button.

Lightning-address (LNURL) input + removing the standalone Swap tab are the
remaining pieces.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/i18n.js b/src/i18n.js
index 041b0be..72d2013 100644
--- a/src/i18n.js
+++ b/src/i18n.js
@@ -356,6 +356,15 @@ const STR = {
     lnCreateInvoice: 'Create invoice',
     copyInvoice: 'Copy invoice',
     amountSatsLabel: 'Amount (sats)',
+    lnQuoting: 'Getting a quote…',
+    lnPayTitle: 'Pay over Lightning',
+    lnPayAmount: 'Amount',
+    lnPayBoltzFee: 'Boltz fee',
+    lnPayNetworkFee: 'Network fee',
+    lnPayTotal: 'Total',
+    lnPayConfirm: 'Pay',
+    lnPaySentTitle: 'Lightning payment sent',
+    lnPaySentBody: 'Boltz pays the invoice once the on-chain lockup confirms.',
     spScan: 'Scan for silent payments',
     spScanning: 'Scanning…',
     spWatching: 'Watching for payments',