Per-network data source; drop duplicate regtest fields; add mutinynet

The network card is now just the network picker. Each network's endpoints
(Electrum server + block explorer) live solely in the Data source card, whose
options change per network and are stored per network (so switching networks
remembers each one's choice). Removes the duplicate regtest Esplora/WS fields.

Adds mutinynet (signet — testnet address format, explorer at mutinynet.com).
Per-network defaults: mainnet → coinos Electrum, testnet/mutinynet → explorer,
regtest → local Fulcrum. Fixes tx-explorer links to use each network's web base
(no double /testnet).

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

1 files changed, 9 insertions, 6 deletions

diff --git a/src/wallet.js b/src/wallet.js
index 3c88b77..5882ee2 100644
--- a/src/wallet.js
+++ b/src/wallet.js
@@ -21,7 +21,7 @@ import * as btc from '@scure/btc-signer';
 import { p2wpkh } from '@scure/btc-signer/payment';
 import { concatBytes } from '@scure/btc-signer/utils.js';
 
-import { Api, pool, wsUrl, getBackend, explorerWeb, electrumCandidates } from './api.js';
+import { Api, pool, getBackend, explorerWeb, electrumCandidates } from './api.js';
 import { ElectrumApi } from './electrum.js';
 import { NostrSync, getSyncConfig } from './nostr.js';
 import { isSilentPaymentAddress, decodeSilentPaymentAddress, silentPaymentScripts, silentPaymentPlaceholder } from './silentpay.js';
@@ -41,6 +41,9 @@ const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
 const NETS = {
   mainnet: { net: btc.NETWORK, coin: 0 },
   testnet: { net: btc.TEST_NETWORK, coin: 1 },
+  // mutinynet is a signet — same address format / version bytes / coin type as
+  // testnet (`tb` HRP); only the chain + servers differ.
+  mutinynet: { net: btc.TEST_NETWORK, coin: 1 },
   // Regtest shares testnet's version bytes / coin type; only the bech32 HRP
   // differs (`bcrt`). @scure/btc-signer derives addresses + validates from this.
   regtest: { net: { ...btc.TEST_NETWORK, bech32: 'bcrt' }, coin: 1 },
@@ -1268,14 +1271,14 @@ export class Wallet {
   // Pushes us new mempool/confirmed transactions for our addresses so history
   // and balances update with no polling.
   wsUrl() {
-    // Electrum backend: pick the current failover candidate (rotated on failure).
-    // Mainnet (when cut over to Fulcrum) and regtest (local Fulcrum) use Electrum.
-    if (getBackend() === 'electrum' && (this.netName === 'mainnet' || this.netName === 'regtest')) {
-      if (!this._wsCandidates || !this._wsCandidates.length) { this._wsCandidates = electrumCandidates(); this._wsCandIdx = 0; }
+    // Electrum backend (any network): pick the current failover candidate for the
+    // active network (rotated on failure). Esplora backend has no push → poll.
+    if (getBackend() === 'electrum') {
+      if (!this._wsCandidates || !this._wsCandidates.length) { this._wsCandidates = electrumCandidates(this.netName); this._wsCandIdx = 0; }
       const list = this._wsCandidates;
       return list.length ? list[(this._wsCandIdx || 0) % list.length] : null;
     }
-    return wsUrl(this.netName); // coinos watcher, or null
+    return null;
   }
 
   // What realtime watches: the fresh frontier (next receive + next change), plus