fix: use isolate.run in bip340 event verifier

packages/ndk/lib/data_layer/repositories/verifiers/bip340_event_verifier.dart

@@ -1,3 +1,5 @@
+import 'dart:isolate';
+
 import 'package:bip340/bip340.dart' as bip340;
 
 import '../../../domain_layer/entities/nip_01_event.dart';
@@ -6,8 +8,14 @@ import '../../../domain_layer/repositories/event_verifier.dart';
 /// Pure dart event verifier using https://pub.dev/packages/bip340
 /// can be slow on mobile devices
 class Bip340EventVerifier implements EventVerifier {
+  bool useIsolate = true;
+
+  Bip340EventVerifier({this.useIsolate = true});
+
   @override
   Future<bool> verify(Nip01Event event) async {
-    return bip340.verify(event.pubKey, event.id, event.sig);
+    return useIsolate? await Isolate.run(() {
+      return bip340.verify(event.pubKey, event.id, event.sig);
+    }) : bip340.verify(event.pubKey, event.id, event.sig);
   }
 }

packages/sample-app/lib/query_performance.dart

@@ -5,6 +5,7 @@ import 'package:ndk_rust_verifier/data_layer/repositories/verifiers/rust_event_v
 
 class MyVerifiers {
   static final bip340Verifier = Bip340EventVerifier();
+  static final bip340VerifierNoIsolate = Bip340EventVerifier(useIsolate: false);
   static final rustVerifier = RustEventVerifier();
 }
 
@@ -19,16 +20,25 @@ class QueryPerformancePage extends StatefulWidget {
 class _QueryPerformancePageState extends State<QueryPerformancePage> {
   int _eventCount = 100;
   String _bip340Time = '';
+  String _bip340NoIsolateTime = '';
   String _rustTime = '';
   bool _isVerifyingBip340 = false;
+  bool _isVerifyingBip340NoIsolate = false;
   bool _isVerifyingRust = false;
 
-  static const relays = ["ws://localhost:10547"];
+  static const relays = ["wss://relay.primal.net"];
 
   final ndkBip340 = Ndk(NdkConfig(
     eventVerifier: MyVerifiers.bip340Verifier,
     cache: MemCacheManager(),
     bootstrapRelays: relays,
+    logLevel: LogLevel.warning
+  ));
+
+  final ndkBip340NoIsolate = Ndk(NdkConfig(
+    eventVerifier: MyVerifiers.bip340VerifierNoIsolate,
+    cache: MemCacheManager(),
+    bootstrapRelays: relays,
   ));
 
   final ndkRust = Ndk(NdkConfig(
@@ -53,6 +63,22 @@ class _QueryPerformancePageState extends State<QueryPerformancePage> {
     });
   }
 
+  Future<void> _runBip340NoIsolateQuery() async {
+    setState(() {
+      _isVerifyingBip340NoIsolate = true;
+      _bip340NoIsolateTime = '';
+    });
+
+    final stopwatch = Stopwatch()..start();
+    await _runQuery(ndkBip340NoIsolate);
+    stopwatch.stop();
+
+    setState(() {
+      _isVerifyingBip340NoIsolate = false;
+      _bip340NoIsolateTime = '${stopwatch.elapsedMilliseconds}ms';
+    });
+  }
+
   Future<void> _runRustQuery() async {
     setState(() {
       _isVerifyingRust = true;
@@ -135,6 +161,23 @@ class _QueryPerformancePageState extends State<QueryPerformancePage> {
               style: Theme.of(context).textTheme.bodyLarge,
             ),
             const SizedBox(height: 24),
+            ElevatedButton(
+              onPressed: _isVerifyingBip340NoIsolate ? null : _runBip340NoIsolateQuery,
+              child: _isVerifyingBip340NoIsolate
+                  ? const SizedBox(
+                height: 20,
+                width: 20,
+                child: CircularProgressIndicator(strokeWidth: 2),
+              )
+                  : const Text('Run with BIP340 (no isolate)'),
+            ),
+            const SizedBox(height: 8),
+            Text(
+              _bip340NoIsolateTime.isEmpty ? 'Not run yet' : 'Time: $_bip340NoIsolateTime',
+              textAlign: TextAlign.center,
+              style: Theme.of(context).textTheme.bodyLarge,
+            ),
+            const SizedBox(height: 24),
             ElevatedButton(
               onPressed: _isVerifyingRust ? null : _runRustQuery,
               child: _isVerifyingRust