Wake hal for wallet-connect requests while it is closed

Step 3, first half. Android Chrome freezes backgrounded PWAs and closes their
relay sockets, so a phone with hal "open" answers nothing — which is what made
Amethyst spin. Push is the only way to reach a frozen app.

- service worker gains a `push` handler. It deliberately does NOT spend: if a
  window is open it nudges it to re-listen, otherwise it raises a notification
  that opens hal on tap. Putting a spend path in the worker is the remaining
  half and wants its own testing.
- hal-side: request permission, subscribe with the notifier's VAPID key, and
  register its service pubkeys with nwcpush.coinos.io. Turning it off
  deregisters, unsubscribes, and clears the pouch — no reason to leave
  spendable keys where a worker can read them if nothing will.
- a Settings toggle, and the ark feature exposes the ASP context the pouch
  record needs.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/src/i18n.js b/src/i18n.js
index b9371e7..1fa7d74 100644
--- a/src/i18n.js
+++ b/src/i18n.js
@@ -439,6 +439,11 @@ const STR = {
     nwcDesc: 'Let another app pay from this wallet over nostr — it never sees your keys, only spends within the limits you set, and you can cut it off at any time. Payments go out over Ark.',
     nwcTabWarning: 'Only works while Hal is open in a tab — it is not an always-on service.',
     nwcAdd: 'Add a connection',
+    nwcBackground: 'Alert me when closed',
+    nwcOn: 'On',
+    nwcOff: 'Off',
+    nwcBackgroundOn: 'You will be notified of payment requests',
+    nwcBackgroundOff: 'Background alerts turned off',
     nwcAppName: 'App name (e.g. Damus)',
     nwcMaxPayment: 'Max per payment (sats)',
     nwcDailyBudget: 'Daily budget (sats)',