Send: a lightning address moves on to the amount by itself

- Pasted with the keyboard (not only the Paste button) it is complete
  text: it advances at once, as a paste always did through the button.
- Typed and then left alone for 0.9s, it is checked quietly (names: our
  registrar or BIP-353 DNS; zaps: the LNURL-pay endpoint answers) and the
  form moves on only if something answers. A half-typed domain answers
  nothing, so it just waits, with no error; finishing it moves on.
- tools/send-lnaddr-advance-test.js (live registrar/DNS, [email protected]).

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Dmcrt9KyNDKVWFKnb8BREo

1 files changed, 6 insertions, 0 deletions

diff --git a/src/features/zaps.js b/src/features/zaps.js
index a99de94..f0b655a 100644
--- a/src/features/zaps.js
+++ b/src/features/zaps.js
@@ -414,6 +414,12 @@ export function zapsFeature(ctx) {
       begin(target, zapDisplay(target, text), tap);
       return true;
     },
+    // A lightning address is real when its server answers as a pay endpoint.
+    async probeLnAddress(text) {
+      const target = parseZapTarget(text);
+      if (!target || target.kind !== 'lnaddr') return false;
+      return fetchPayParams(target.url).then(() => true, () => false);
+    },
     // The typed-lightning-address affordance on the send form.
     sendFormNote(a) {
       if (!canPay() || !ui.send || ui.send.recipients.length !== 1) return null;