Gift cross-device sync, snapshot size cap, reliable SW updates, gift-detail layout

- Gifts now sync across devices: gift records + reserved/reclaimed coin
  sets ride the encrypted snapshot as a merge-safe extension (like ark),
  and every gift state change (create/reclaim/revoke) triggers a
  saveCache so it actually publishes. A gift made on one device now
  shows on the others.
- Cap the published snapshot at ~40KB JSON (relay rejects >64KB events,
  nip44 expands ~1.5x): trim oldest on-chain txs when oversized; another
  device backfills via rescan. Typical wallets untouched.
- Service worker: register with updateViaCache:'none' so a new build is
  detected immediately (not held by the 4h HTTP cache), and reload once
  on controllerchange so the fresh app runs without a manual second
  refresh.
- Gift detail: View/Reclaim share a row, Revoke on its own full-width
  line so 'Revoke now' stops wrapping.

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

1 files changed, 8 insertions, 1 deletions

diff --git a/build.js b/build.js
index 5165669..58ca0ba 100644
--- a/build.js
+++ b/build.js
@@ -104,8 +104,15 @@ const PWA_HEAD = `<link rel="manifest" href="manifest.webmanifest">
 <link rel="apple-touch-icon" href="icon-192.png">
 `;
 
+// Register with updateViaCache:'none' so the browser always re-fetches sw.js
+// (never from HTTP cache) and detects a new build immediately. When the new SW
+// takes control (it skipWaiting + clients.claim), reload once so the fresh
+// inlined app runs — but only if a SW was already controlling this page, so a
+// first-ever visit doesn't reload.
 const SW_REGISTER =
-  `<script>if('serviceWorker'in navigator)addEventListener('load',function(){navigator.serviceWorker.register('sw.js').catch(function(){})});</script>`;
+  `<script>if('serviceWorker'in navigator){var _had=!!navigator.serviceWorker.controller,_ref=false;` +
+  `navigator.serviceWorker.addEventListener('controllerchange',function(){if(_had&&!_ref){_ref=true;location.reload()}});` +
+  `addEventListener('load',function(){navigator.serviceWorker.register('sw.js',{updateViaCache:'none'}).catch(function(){})})}</script>`;
 
 // Bundle the standalone jsQR decoder (sets window.jsQR) for lazy loading.
 export async function buildJsQr({ minify = true } = {}) {