Fix false "payment received" on import; PWA; send-page font

- Don't celebrate historical payments on import. receiveSeenIndex was
  baselined to 0 before the scan ran, so when the scan advanced the
  index every past payment looked new and flashed "payment received".
  Leave it null until the post-scan ack logic baselines it.
- PWA: add a web manifest, ₿ icons (192/512 + maskable), theme/apple
  meta tags, and a service worker that precaches the shell so the
  installed app works offline. index.html stays self-contained; the
  sidecar files just 404 harmlessly from file://. build.js emits them.
- Send page: drop btn-sm from the amount unit toggle so "sats" matches
  the "Max" button size (both 16px).

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

1 files changed, 9 insertions, 4 deletions

diff --git a/src/app.js b/src/app.js
index bccb86d..8343290 100644
--- a/src/app.js
+++ b/src/app.js
@@ -466,6 +466,10 @@ async function enterWallet(mnemonic, passphrase) {
   const hadCache = wallet.restoreCache(); // show last-known balance/history instantly
   ui.screen = 'wallet';
   ui.tab = 'receive';
+  // Not baselined yet — stays null until the scan + ack logic below sets it,
+  // so the celebration never fires for payments that were already there at
+  // import (the index only looks "advanced" because the scan hadn't run yet).
+  ui.receiveSeenIndex = null;
   ui.send = blankSend();
   ui.draft = null;
   ui.sendResult = null;
@@ -760,11 +764,12 @@ function tabContent() {
 
 // ---------------------------------------------------------------- Receive
 function receiveTab() {
-  if (ui.receiveSeenIndex == null) ui.receiveSeenIndex = wallet.nextReceiveIndex;
-
   // A payment landed on the shown address (the fresh index advanced past what
   // the user last saw) — celebrate, and wait for a tap before showing the next.
-  if (wallet.nextReceiveIndex > ui.receiveSeenIndex) {
+  // Until receiveSeenIndex has been baselined (post-scan, in enterWallet) it
+  // stays null and we never celebrate, so importing a wallet with existing
+  // history doesn't flash "payment received" for old payments.
+  if (ui.receiveSeenIndex != null && wallet.nextReceiveIndex > ui.receiveSeenIndex) {
     let amt = 0;
     for (let i = ui.receiveSeenIndex; i < wallet.nextReceiveIndex; i++) {
       const e = wallet._addrInfo(0, i);
@@ -837,7 +842,7 @@ function recipientRow(s, r, i) {
           r.amount = v;
         },
       }),
-      h('button', { type: 'button', class: 'btn-sm', title: t('switchUnit'), onClick: toggleUnit }, unitLabel()),
+      h('button', { type: 'button', title: t('switchUnit'), onClick: toggleUnit }, unitLabel()),
       single && h('button', { type: 'button', class: s.max ? 'btn-primary' : '', onClick: () => { s.max = !s.max; render(); } }, t('max'))
     )
   );