Allow signed-tx export when online; clarify it isn't sent

- Add a "Sign & export (broadcast elsewhere)" action on the online
  review screen so you can sign here and broadcast from another device,
  not just in offline mode.
- The signed-result screen now reads as an amber caution ("Signed, but
  not sent yet… it will not send on its own") instead of a green
  success banner, so it can't be mistaken for a completed send.

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

2 files changed, 9 insertions, 3 deletions

diff --git a/src/app.js b/src/app.js
index 86a2811..11f0589 100644
--- a/src/app.js
+++ b/src/app.js
@@ -1079,7 +1079,12 @@ function reviewView() {
         : wallet.offline
           ? h('button', { class: 'btn-primary grow', onClick: signForExport }, t('signTx'))
           : h('button', { class: 'btn-primary grow', onClick: broadcast }, t('signBroadcast'))
-    )
+    ),
+    // Online: also allow signing without broadcasting, to relay the signed tx
+    // from another device (air-gapped, or a different network).
+    !wallet.offline && !ui.busy
+      ? h('button', { class: 'btn-block', style: 'margin-top:8px', onClick: signForExport }, t('signExport'))
+      : null
   );
 }
 
@@ -1122,7 +1127,7 @@ function sendResultView() {
     return h(
       'div',
       { class: 'card col' },
-      h('div', { class: 'notice ok' }, t('txSignedNote')),
+      h('div', { class: 'warn-box' }, t('txSignedNote')),
       h('div', { class: 'small muted' }, t('transactionId')),
       h('div', { class: 'addr-box' }, r.txid),
       h('div', { class: 'small muted mt8' }, t('signedTxRaw')),
diff --git a/src/i18n.js b/src/i18n.js
index ba85819..9a02afe 100644
--- a/src/i18n.js
+++ b/src/i18n.js
@@ -103,10 +103,11 @@ const STR = {
     offlineSignNote: 'Offline: sign now, then broadcast the signed transaction from an online device.',
     signBroadcast: 'Sign & broadcast',
     signTx: 'Sign transaction',
+    signExport: 'Sign & export (broadcast elsewhere)',
     broadcastFailed: 'Broadcast failed: {msg}',
     signingFailed: 'Signing failed: {msg}',
     done: 'Done',
-    txSignedNote: '✓ Transaction signed. Broadcast the code below from any online device (e.g. mempool.space → Broadcast).',
+    txSignedNote: 'Signed, but not sent yet. To actually send it, broadcast the code below from any online device (e.g. mempool.space → Broadcast). It will not send on its own.',
     transactionId: 'Transaction ID',
     signedTxRaw: 'Signed transaction (code)',
     copyHex: 'Copy code',