Fix send-form UX around lightning pays; harden ln state machines

- a rejected cosign (gRPC INVALID_ARGUMENT) returns the input vtxo to
  spendable and fails the action instead of leaving it pending forever —
  the stuck-pending state that pushed small zaps onto Boltz's 25k minimum
- ark ln-pay now takes over when funds are settling (retrying quote) rather
  than falling through to Boltz
- typing a destination clears stale send errors (also cleared on tab
  switch); paste path likewise
- typed lightning addresses no longer auto-advance mid-keystroke (the
  matcher fired at `[email protected]` before `.com`, yanking the form away): the send
  form offers an explicit "Zap <addr>" button; pasted/scanned addresses
  still advance immediately
- ln-recv: HTLC vtxos anchored to a not-yet-confirmed pool round park and
  retry instead of throwing; the requested HTLC expiry is anchored on first
  prepare so retries can't inflate it past the server's grant

Co-Authored-By: Claude Fable 5 <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/tools/ark/ln-e2e-test.js b/tools/ark/ln-e2e-test.js
index b11f542..4d31b56 100644
--- a/tools/ark/ln-e2e-test.js
+++ b/tools/ark/ln-e2e-test.js
@@ -112,6 +112,9 @@ const payerDone = new Promise((r) => payer.on('close', (code) => r(code)));
 
 for (let i = 0; i < 40 && !['done', 'failed'].includes(mgr.lnAction(recv.id).step); i++) {
   await sleep(1500);
+  // fresh pool vtxos anchor to a possibly-unconfirmed issuance round — keep
+  // blocks coming so the HTLC vtxo validation can pass
+  if (i % 3 === 2) sh('docker exec bc bitcoin-cli -rpcwallet=coinos -generate 1 >/dev/null');
   await mgr.driveLn(recv.id);
 }
 const r = mgr.lnAction(recv.id);