feat: native 重连机制优化

native/lib/features/terminal/ssh_terminal_controller.dart

@@ -50,8 +50,15 @@ class SshTerminalController {
     try {
       final transport = await _transportFactory.open(
         config,
-        logger: (message) => terminal.write('[Info] $message\r\n'),
+        logger: (message) {
+          if (_disposed) return;
+          terminal.write('[Info] $message\r\n');
+        },
       );
+      if (_disposed) {
+        await transport.close();
+        return;
+      }
       _transport = transport;
       terminal.write('[Info] 准备连接目标终端: ${config.name} - ${config.host}\r\n');
       // dartssh2 `SSHKeyPair.fromPem` already returns `List<SSHKeyPair>`, no
@@ -68,18 +75,24 @@ class SshTerminalController {
         identities: identities,
       );
     } on SshTransportException catch (error) {
+      if (_disposed) return;
       terminal.write('[Error] ${error.message}\r\n');
       rethrow;
     } catch (error) {
+      if (_disposed) return;
       terminal.write('[Error] $error\r\n');
       rethrow;
     }
+    if (_disposed) return;
     final session = await _client!.shell();
+    if (_disposed) return;
     _session = session;
     _stdoutSub = session.stdout.listen((data) {
+      if (_disposed) return;
       _writeTerminalOutput(utf8.decode(data, allowMalformed: true));
     });
     _stderrSub = session.stderr.listen((data) {
+      if (_disposed) return;
       _writeTerminalOutput(utf8.decode(data, allowMalformed: true));
     });
     terminal.onOutput = (data) {
@@ -140,6 +153,8 @@ class SshTerminalController {
 
   Future<void> disconnect() async {
     _disposed = true;
+    terminal.onOutput = null;
+    terminal.onResize = null;
     await _stdoutSub?.cancel();
     await _stderrSub?.cancel();
     _stdoutSub = null;

native/lib/features/terminal/terminal_session_manager.dart

@@ -74,12 +74,18 @@ class TerminalSessionManager extends ChangeNotifier {
     final session = _findOrNull(id);
     if (session == null) return;
     final terminal = session.controller.terminal;
-    await session.controller.disconnect();
+    // Force-disconnect regardless of current state (connecting/connected/error).
+    final oldController = session.controller;
     session.controller = SshTerminalController(
       config: session.config,
       terminal: terminal,
     );
-    session.controller.terminal.write('\r\n[Reconnecting]\r\n');
+    session.status = TerminalSessionStatus.connecting;
+    notifyListeners();
+    // Tear down the old controller in the background — it no longer owns the
+    // terminal so its disconnect cannot interfere with the new connection.
+    unawaited(oldController.disconnect());
+    terminal.write('\r\n[Reconnecting]\r\n');
     await _connect(session);
   }
 
@@ -112,12 +118,18 @@ class TerminalSessionManager extends ChangeNotifier {
   }
 
   Future<void> _connect(TerminalSession session) async {
+    final controller = session.controller;
     session.status = TerminalSessionStatus.connecting;
     session.lastError = null;
     notifyListeners();
     try {
-      await session.controller.connect();
-      if (!_sessions.contains(session)) return;
+      await controller.connect();
+      // After await, verify this controller is still the active one — a
+      // concurrent reconnect may have replaced it.
+      if (!_sessions.contains(session) ||
+          session.controller != controller) {
+        return;
+      }
       session.status = TerminalSessionStatus.connected;
       notifyListeners();
       if (_shouldAutoStartStatusMonitor()) {
@@ -129,7 +141,10 @@ class TerminalSessionManager extends ChangeNotifier {
         );
       }
     } catch (error) {
-      if (!_sessions.contains(session)) return;
+      if (!_sessions.contains(session) ||
+          session.controller != controller) {
+        return;
+      }
       session.status = TerminalSessionStatus.error;
       session.lastError = error.toString();
       session.controller.terminal.write('\r\n[Error] ${session.lastError}\r\n');