fix: address unimplemented/broken issues across server and desktop

desktop/lib/src/terminal_screen.dart

@@ -320,12 +320,12 @@ class _StatusBar extends StatelessWidget {
             ),
           ),
           SizedBox(width: 20),
-          _Hint('鼠标拖选复制', RttyTheme.textFaint),
+          _Hint('拖选复制', RttyTheme.textFaint),
           SizedBox(width: 14),
-          _Hint('右键粘贴', RttyTheme.textFaint),
+          _Hint('Ctrl+Shift+C / V 复制粘贴', RttyTheme.textFaint),
           Spacer(),
           Text(
-            'FLUTTER × XTERM × ALCATTERM ENGINE',
+            'FLUTTER × XTERM TERMINAL',
             style: TextStyle(color: RttyTheme.textFaint, fontSize: 10),
           ),
         ],

desktop/test/e2e_ws_test.dart

@@ -2,18 +2,22 @@
 //
 // 运行前需先启动 Rust 服务端：cd .. && cargo run
 // 运行：flutter test test/e2e_ws_test.dart
-import 'dart:io';
-
 import 'package:flutter_test/flutter_test.dart';
 import 'package:xterm/xterm.dart';
 
-import '../lib/src/rtty_client.dart';
+import 'package:rtty_desktop/src/rtty_client.dart';
+
+import 'support.dart';
 
 void main() {
   TestWidgetsFlutterBinding.ensureInitialized();
 
   test('RttyClient connects to Rust server and renders command output',
       () async {
+    if (!await isServerUp('127.0.0.1', 8080)) {
+      markTestSkipped('Rtty server not running');
+      return;
+    }
     final terminal = Terminal();
     final client = RttyClient(terminal);
 

desktop/test/regression_ws_test.dart

@@ -0,0 +1,77 @@
+// 多端解耦 + 控制权强制回归验证（连真实 Rust 服务端）。
+import 'dart:convert';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:web_socket_channel/io.dart';
+
+import 'support.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  test('多端解耦 + 控制权强制 + 会话清理', () async {
+    if (!await isServerUp('127.0.0.1', 8080)) {
+      markTestSkipped('Rtty server not running');
+      return;
+    }
+    final base = 'ws://127.0.0.1:8080/ws';
+
+    // 1. 桌面端（client=desktop）：收 raw 二进制，不收 snapshot。
+    final desktop = IOWebSocketChannel.connect(Uri.parse('$base?client=desktop'));
+    final dOut = <String>[];
+    desktop.stream.listen((m) {
+      if (m is List<int>) {
+        dOut.add('binary:${utf8.decode(m, allowMalformed: true)}');
+      } else if (m is String) {
+        dOut.add('text:${m.length > 100 ? m.substring(0, 100) : m}');
+      } else {
+        dOut.add('$m');
+      }
+    });
+    await Future<void>.delayed(const Duration(milliseconds: 700));
+    final dHasBinary = dOut.any((e) => e.startsWith('binary:'));
+    final dHasSnapshot = dOut.any((e) => e.contains('mobile_snapshot'));
+    expect(dHasBinary, isTrue, reason: '桌面端应收到原始 ANSI 二进制 $dOut');
+    expect(dHasSnapshot, isFalse, reason: '桌面端不应收到语义快照 $dOut');
+
+    // 2. 移动端（client=mobile）：收 snapshot，不收 binary。
+    final mobile = IOWebSocketChannel.connect(Uri.parse('$base?client=mobile'));
+    final mOut = <String>[];
+    mobile.stream.listen((m) {
+      if (m is List<int>) {
+        mOut.add('binary:${utf8.decode(m, allowMalformed: true)}');
+      } else if (m is String) {
+        mOut.add('text:${m.length > 100 ? m.substring(0, 100) : m}');
+      } else {
+        mOut.add('$m');
+      }
+    });
+    await Future<void>.delayed(const Duration(milliseconds: 700));
+    final mHasSnapshot = mOut.any((e) => e.contains('mobile_snapshot'));
+    final mHasBinary = mOut.any((e) => e.startsWith('binary:'));
+    expect(mHasSnapshot, isTrue, reason: '移动端应收到语义快照 $mOut');
+    expect(mHasBinary, isFalse, reason: '移动端不应收到二进制 $mOut');
+
+    // 3. 桌面端发命令，确认 raw 输出回显。
+    desktop.sink.add(jsonEncode({'type': 'input', 'data': 'echo D_E2E\r\n'}));
+    await Future<void>.delayed(const Duration(milliseconds: 900));
+    expect(dOut.join('\n').contains('D_E2E'), isTrue, reason: '桌面端命令回显');
+
+    // 4. 控制权强制：桌面端 claim 后，移动端输入被拒。
+    desktop.sink.add(jsonEncode({'type': 'claim_control'}));
+    await Future<void>.delayed(const Duration(milliseconds: 400));
+    mobile.sink
+        .add(jsonEncode({'type': 'input', 'data': 'echo BLOCKED_SHOULD_NOT_SHOW\r\n'}));
+    await Future<void>.delayed(const Duration(milliseconds: 900));
+    final both = (dOut.join('\n') + mOut.join('\n'));
+    expect(both.contains('BLOCKED_SHOULD_NOT_SHOW'), isFalse,
+        reason: '非控制者输入应被阻止');
+
+    // 5. 会话清理：exit 触发会话移除。
+    desktop.sink.add(jsonEncode({'type': 'input', 'data': 'exit\r\n'}));
+    await Future<void>.delayed(const Duration(milliseconds: 1300));
+
+    desktop.sink.close();
+    mobile.sink.close();
+  });
+}

desktop/test/support.dart

@@ -0,0 +1,14 @@
+// 集成测试共享工具。
+import 'package:web_socket_channel/io.dart';
+
+/// 探测 Rtty 服务端是否可达；返回 false 时集成测试应被跳过。
+Future<bool> isServerUp(String host, int port) async {
+  try {
+    final ws = IOWebSocketChannel.connect(Uri.parse('ws://$host:$port/ws'));
+    await ws.ready.timeout(const Duration(seconds: 2));
+    ws.sink.close();
+    return true;
+  } catch (_) {
+    return false;
+  }
+}