Fix Windows local node daemon arguments

lib/services/windows_local_node_service.dart

@@ -39,20 +39,9 @@ class WindowsLocalNodeService implements LocalNodeService {
   @override
   Future<bool> stop() async {
     final effective = _resolveConfig(null);
-    final pidFile = File(await _pidFilePath());
-    if (!await pidFile.exists()) {
-      _logger.w('Local node pidfile not found at ${pidFile.path}');
-      return false;
-    }
-    final rawPid = await pidFile.readAsString();
-    final pid = int.tryParse(rawPid.trim());
-    if (pid == null) {
-      _logger.w('Local node pidfile invalid: $rawPid');
-      return false;
-    }
-    final killed = Process.killPid(pid);
-    if (!killed) {
-      _logger.w('Failed to terminate local node process ($pid)');
+    final stopped = await _stopViaRpc(effective);
+    if (!stopped) {
+      _logger.w('Failed to stop local node via RPC.');
       return false;
     }
     return _waitForStop(effective);
@@ -86,7 +75,6 @@ class WindowsLocalNodeService implements LocalNodeService {
       );
       return false;
     }
-    final pidFile = await _pidFilePath();
     final daemonLogFile = await AppPaths.localNodeLogFile();
     final launcherLogFile = await AppPaths.localNodeLauncherLogFile();
     await launcherLogFile.parent.create(recursive: true);
@@ -97,8 +85,6 @@ class WindowsLocalNodeService implements LocalNodeService {
       config.rpcHost,
       '--rpc-bind-port',
       config.rpcPort.toString(),
-      '--pidfile',
-      pidFile,
       '--log-file',
       daemonLogFile.path,
       ...config.extraArgs,
@@ -200,6 +186,35 @@ class WindowsLocalNodeService implements LocalNodeService {
     }
   }
 
+  Future<bool> _stopViaRpc(LocalNodeConfig config) async {
+    HttpClient? client;
+    try {
+      client = HttpClient();
+      final uri = Uri.parse('http://${config.rpcHost}:${config.rpcPort}/json_rpc');
+      final request = await client.postUrl(uri);
+      request.headers.contentType = ContentType.json;
+      request.write(jsonEncode({
+        'jsonrpc': '2.0',
+        'id': '0',
+        'method': 'stop_daemon',
+      }));
+      final response = await request.close();
+      final body = await utf8.decoder.bind(response).join();
+      if (response.statusCode != HttpStatus.ok) {
+        _logger.w(
+          'Local node stop_daemon returned HTTP ${response.statusCode}: $body',
+        );
+        return false;
+      }
+      return true;
+    } catch (error) {
+      _logger.w('Failed to call stop_daemon on local node: $error');
+      return false;
+    } finally {
+      client?.close(force: true);
+    }
+  }
+
   LocalNodeConfig _resolveConfig(LocalNodeConfig? config) {
     final base = config ?? _lastConfig ?? const LocalNodeConfig();
     return _applyOverrides(base);
@@ -252,8 +267,4 @@ class WindowsLocalNodeService implements LocalNodeService {
     }
     return null;
   }
-
-  Future<String> _pidFilePath() async {
-    return (await AppPaths.localNodePidFile()).path;
-  }
 }