Fold the coinos opt-out into a single Data source picker

Replace the Esplora|Electrum backend toggle plus the separate 'Instant
notifications' on/off with one 'Data source' selector:
  • coinos (instant)  — default; explorer data + coinos push
  • Block explorer     — REST + polling, nothing sent to coinos (the opt-out)
  • Electrum server    — one WS server for data + push (your node / public)

Picking a non-coinos source IS the privacy opt-out, so the standalone toggle is
gone. A single 'mode' setting drives getBackend()/getRealtimeEnabled(), so the
wallet/wsUrl logic is unchanged; existing per-feature settings migrate in
(realtime=off → explorer, backend=electrum → electrum). coinos⇄explorer just
flips the watcher (no rescan); to/from electrum rebuilds the backend.

Sets up cleanly for a future coinos Fulcrum: 'coinos' mode upgrades from
REST+watcher to a full Electrum backend transparently.

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

1 files changed, 7 insertions, 5 deletions

diff --git a/src/i18n.js b/src/i18n.js
index aa8b499..e3341a7 100644
--- a/src/i18n.js
+++ b/src/i18n.js
@@ -260,14 +260,16 @@ const STR = {
     explorerUrl: 'Server URL',
     explorerUrlHint: 'Esplora / electrs REST base, e.g. https://mempool.space/api',
     dataSource: 'Data source',
-    backendEsplora: 'Explorer',
-    backendElectrum: 'Electrum',
-    backendElectrumDesc: 'Fetch data and get instant payments over one Electrum WebSocket. Point it at your own Fulcrum/electrs for a fully self-hosted wallet — no coinos, no REST.',
+    dataSourceDesc: 'Where Hal reads the chain and how it learns about incoming payments.',
+    modeCoinos: 'coinos (instant)',
+    modeCoinosDesc: 'The default. Instant payment alerts via coinos, with chain data from a public block explorer.',
+    modeExplorer: 'Block explorer',
+    modeExplorerDesc: 'Reads from your chosen block explorer and polls for payments — nothing is sent to coinos. A bit slower.',
+    modeElectrum: 'Electrum server',
+    backendElectrumDesc: 'Data and instant payments over one Electrum WebSocket. Point it at your own Fulcrum/electrs for a fully self-hosted wallet — no coinos, no REST.',
     electrumUrl: 'Electrum server (wss://)',
     electrumUrlHint: 'A WebSocket Electrum server, e.g. wss://your-node:50004',
     silentPaymentNote: 'Silent payment',
-    instantNotif: 'Instant notifications',
-    instantNotifDesc: 'Uses coinos to push payments the instant they arrive. Turn off to poll the explorer above instead — a bit slower, but your addresses are never sent to coinos.',
     deviceSync: 'Device sync',
     deviceSyncDesc: 'Keep this wallet in sync across your devices by storing an encrypted copy on a Nostr relay — only a device with your seed can read it. Turn it off to keep everything on this device.',
     syncAcross: 'Sync across devices',