Push notifications for payments and messages; offline Spending notice

The nwcpush notifier grows a second registration kind alongside NWC:
a notify watch of what it can see without keys — kind-1059 wraps
p-tagged at the user (DMs, direct invites), zap receipts (9735/9737),
and wraps authored by the user's community channel keys (chat). It
pushes a typed nudge, throttled per device (chat bursts collapse); the
service worker shows a generic notification unless a window is visible,
and tapping opens the app. The names registrar reports settled
lightning-address receives server-to-server (token-gated /notify), so
the common payment path notifies even with no nostr event in sight.

The app registers silently whenever permission is already granted and
keeps the watch current as communities change; a dismissible card on
the chat home offers to enable it otherwise. Ark zap receipts (9737)
join the relay whitelist so the payment watch can see them.

Also: the offline Spending receive pane now says you're offline and
offers a one-tap switch to Savings instead of spinning forever.

Co-Authored-By: Claude Fable 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Wvj4aoeMZwA7VUGdJP9Swi

1 files changed, 21 insertions, 0 deletions

diff --git a/src/sw-nwc.js b/src/sw-nwc.js
index b6cfc01..0fdc4d7 100644
--- a/src/sw-nwc.js
+++ b/src/sw-nwc.js
@@ -11,6 +11,27 @@ const NOTIFIER = 'https://nwcpush.coinos.io';
 self.addEventListener('push', (e) => {
   let data = {};
   try { data = e.data ? e.data.json() : {}; } catch (_) {}
+  // User-facing notifications (payments, DMs, community chat). An open
+  // window already shows everything live — stay quiet then.
+  if (data.type === 'notify') {
+    e.waitUntil((async () => {
+      const clients = await self.clients.matchAll({ type: 'window', includeUncontrolled: true });
+      if (clients.some((c) => c.visibilityState === 'visible')) return;
+      const T = {
+        payment: ['Payment received', data.amountSat ? `+${Number(data.amountSat).toLocaleString()} sats — open coinos to see it.` : 'Open coinos to see it.'],
+        dm: ['New message', 'You have a new private message.'],
+        chat: ['New chat activity', 'There are new messages in your communities.'],
+      };
+      const [title, body] = T[data.reason] || T.chat;
+      await self.registration.showNotification(title, {
+        body,
+        icon: 'icon-192.png', badge: 'icon-192.png',
+        tag: 'notify-' + (data.reason || 'chat'), renotify: data.reason === 'payment',
+        data: { url: './' },
+      });
+    })());
+    return;
+  }
   if (data.type !== 'nwc') return;
   e.waitUntil((async () => {
     // An open window handles requests itself with full wallet state — nudge