feat: 实验性连接信息导出与会话恢复，重写关于页

- SessionShare：把 userId / JSESSIONID / token 打成 Base64(JSON)，Cookie 只保留
  JSESSIONID 一项，粘贴时容忍换行与空白，QR 令牌与乱码解不出来
- 主页底部新增「导出连接信息」卡片，标记实验性：内容未加密，字符串在手即可操作账号
- 登录页识别到连接信息时把登录按钮换成「恢复会话」，不必再扫 QR 令牌
- 恢复优先沿用导入的 JSESSIONID（不重发 UserLoginApi，免得顶掉机台上的登录），
  Cookie 失效才退回用 token 登录；验证 Cookie 时顺手拉到的 GetUserDataApi 结果
  直接交给主页展示，省一次请求
- 仅凭 Cookie 恢复的会话没有 loginId / loginDateTime，_gameLogin 保持 null，
  票据与风险页照旧提示「尚未登录游戏服务器」，主页顶部给出说明横幅
- 关于页改用 AppCard / SectionTitle 脚手架，补基本信息与风险提示，把过时的
  「jsQR (web)」致谢换成原生 MethodChannel（QR 解码早已不走 web 库）

README.md

@@ -17,6 +17,7 @@ Android / iOS / Windows / macOS / Linux。
 | B50 | Best 50 成绩图，可导出 PNG（移植自 Empurple 的 `Best50ImageRenderer`） |
 | 风险 | 歌曲解锁、收藏品获取、旅行伙伴发放与编组（含等级）、修改总 Rating、添加舞里程、一键跑图、万花筒专区 |
 | 设置 | Title Server / Auth Server / 机器参数，支持配置导入导出 |
+| 连接信息（实验性） | 主页导出 uid + JSESSIONID + token 的 Base64 快照，登录页粘贴即可恢复会话；内容未加密，请勿外传 |
 
 ## 开发
 

lib/config/strings.dart

@@ -11,10 +11,8 @@ class AppStrings {
 
   // Login
   static const appTitle = 'Ichino';
-  static const loginSubtitle = '扫描或输入二维码进行登录';
   static const qrCodeToken = 'QR Code 令牌';
-  static const qrHint = '粘贴二维码解析内容...';
+  static const qrHint = '粘贴二维码解析内容... / 粘贴连接信息';
-  static const qrParsedResult = '解析结果（截取后 64 位）';
   static const uploadQR = '上传二维码';
   static const login = '登录';
   static const loggingIn = '登录中...';
@@ -26,6 +24,26 @@ class AppStrings {
   static const requestFailed = '请求失败';
   static const settingsTooltip = '设置';
 
+  // 连接信息（实验性）：uid + JSESSIONID + token 的 Base64 快照
+  static const experimentalBadge = '实验性';
+  static const connectionShareTitle = '导出连接信息';
+  static const connectionShareDesc =
+      '把用户 ID、JSESSIONID Cookie 与登录令牌打包成 Base64，'
+      '在其他设备的登录页粘贴即可恢复会话。';
+  static const connectionShareSecurity = '内容未加密，拿到这串字符的人可以直接操作该账号。';
+  static const connectionShareCopy = '复制到剪贴板';
+  static const connectionShareCopied = '连接信息已复制到剪贴板';
+  static const connectionShareEmpty = '当前会话既没有 Cookie 也没有令牌，无法导出。';
+  static const restoreSession = '恢复会话';
+  static const restoringSession = '恢复中...';
+  static const sessionShareDetected = '已识别为连接信息（实验性功能），点击「恢复会话」直接续上这次登录。';
+  static const sessionRestoreFailed = '会话恢复失败';
+  static const sessionRestoreCookie = '已复用连接信息里的 JSESSIONID，没有重新登录';
+  static const sessionRestoreToken = 'Cookie 不可用，已用令牌重新登录';
+  static const sessionRestoredNotice =
+      '这是用连接信息恢复的会话：JSESSIONID 只用于读取数据，'
+      '票据与风险页的写入操作需要先重新登录。';
+
   // Home
   static const logoutTooltip = '退出登录';
   static const titleServerNotConfigured = '未配置 Title Server';
@@ -115,8 +133,7 @@ class AppStrings {
   static const selectedTicket = '已选票';
   static const ticketUsed = '功能票使用完成';
   static const ticketCooldownSeconds = 60;
-  static String ticketCooldownCountdown(int remaining) =>
+  static String ticketCooldownCountdown(int remaining) => '冷却中，剩余 $remaining 秒';
-      '冷却中，剩余 $remaining 秒';
   static String ticketCooldownNotice(int remaining) =>
       '登录后需冷却 $ticketCooldownSeconds 秒，剩余 $remaining 秒后可使用功能票。';
 
@@ -434,14 +451,22 @@ class AppStrings {
   static String best50Exported(String? path) =>
       path == null ? '图片已导出' : '图片已导出到 $path';
   static String best50ExportFailed(String error) => '导出失败: $error';
-  static const best50Footer = 'Generated by Ichino. UI designed by chuxuehaocai.';
+  static const best50Footer =
+      'Generated by Ichino. UI designed by chuxuehaocai.';
 
   // About
   static const aboutTitle = 'Ichino';
   static const aboutDesc = '基于 QR Code 的 maimai DX 街机网络登录客户端。';
+  static const aboutBasics = '基本信息';
+  static const aboutPlatforms = '支持平台';
+  static const aboutPackageId = '应用标识';
+  static const aboutRiskNotice =
+      '「风险」页会向服务器发送伪造的 UpsertUserAllApi 数据包，属于高危操作，可能封号。';
   static const credits = '致谢';
   static const creditBuiltWith = '构建框架';
   static const creditQRDecode = 'QR 解码';
+  static const creditB50 = 'B50 成绩图';
+  static const creditProtocol = '协议实现参考';
   static const creditIconAssets = '图标资源';
   static const creditLicense = '许可证';
 }

lib/models/session_model.dart

@@ -3,6 +3,20 @@ import 'package:flutter/foundation.dart';
 import '../config/title_server_config.dart';
 import '../services/api_service.dart';
 import '../services/title_api_service.dart';
+import 'session_share.dart';
+import 'user_data.dart';
+
+/// [SessionModel.restoreFromShare] 的结果。
+class SessionRestoreResult {
+  /// `true` 表示沿用了连接信息里的 JSESSIONID；`false` 表示用令牌重新登录，
+  /// 拿到了一份新 Cookie。
+  final bool reusedCookie;
+
+  /// 沿用旧会话时顺带拉到的用户数据（HomePage 直接展示，省一次请求）。
+  final UserDataBean? userData;
+
+  const SessionRestoreResult({required this.reusedCookie, this.userData});
+}
 
 class SessionModel extends ChangeNotifier {
   static final SessionModel instance = SessionModel._();
@@ -48,10 +62,7 @@ class SessionModel extends ChangeNotifier {
     return login;
   }
 
-  Future<void> logoutGame({
+  Future<void> logoutGame({required int userId, String? cookies}) async {
-    required int userId,
-    String? cookies,
-  }) async {
     final login = _gameLogin;
     if (login == null) return;
     final config = TitleServerConfigHolder().config;
@@ -75,6 +86,51 @@ class SessionModel extends ChangeNotifier {
     notifyListeners();
   }
 
+  /// 实验性：导出连接信息（用户 ID + JSESSIONID + 令牌）。
+  SessionShare exportConnectionInfo({
+    required int userId,
+    required String token,
+  }) => SessionShare(userId: userId, token: token, cookie: _cookies);
+
+  /// 实验性：用连接信息恢复会话。
+  ///
+  /// 带着可用的 JSESSIONID 时沿用这个会话继续交互，不重发 `UserLoginApi`；
+  /// 没有 Cookie 或 Cookie 已失效，才退回去用令牌登录一次拿新 Cookie。
+  Future<SessionRestoreResult> restoreFromShare(SessionShare share) async {
+    final cookie = share.jsessionid;
+    if (cookie != null) {
+      final userData = await _probeCookieSession(share.userId, cookie);
+      if (userData != null) {
+        // _gameLogin 保持 null：这次没有 UserLoginApi，拿不到 loginId /
+        // loginDateTime，写入类功能页照旧提示「尚未登录游戏服务器」。
+        notifyListeners();
+        return SessionRestoreResult(reusedCookie: true, userData: userData);
+      }
+    }
+
+    if (!share.hasToken) {
+      throw const TitleApiException('连接信息里的 Cookie 已失效，且没有可用于重新登录的令牌');
+    }
+    await loginGame(userId: share.userId, token: share.token);
+    return const SessionRestoreResult(reusedCookie: false);
+  }
+
+  /// 用导入的 Cookie 试拉一次 GetUserDataApi，会话不可用时返回 `null`。
+  Future<UserDataBean?> _probeCookieSession(int userId, String cookie) async {
+    final service = TitleApiService.fromHolder(cookies: cookie);
+    if (service == null) return null;
+    try {
+      final json = await service.getUserData(userId);
+      // 会话失效时服务器仍可能回一个不含 userData 的包，不能当成登录成功。
+      if (json['userData'] is! Map) return null;
+      final userData = UserDataBean.fromJson(json);
+      updateCookies(service.cookies);
+      return userData;
+    } on TitleApiException {
+      return null;
+    }
+  }
+
   void updateCookies(String? cookies) {
     if (cookies != null && cookies.isNotEmpty) {
       _cookies = cookies;

lib/models/session_share.dart

@@ -0,0 +1,76 @@
+import 'dart:convert';
+
+/// 实验性：一次登录的可搬运快照（用户 ID + JSESSIONID Cookie + 令牌），
+/// 编码方式是 Base64(JSON)，用于在别的设备上恢复会话、免重新扫码。
+///
+/// 没有任何加密，字符串在谁手里谁就能操作这个账号，只适合自己传递。
+class SessionShare {
+  static const String _kind = 'ichino.session';
+  static const int _version = 1;
+
+  final int userId;
+  final String token;
+
+  /// 原始 Cookie 串，可能是 `JSESSIONID=...`，也可能带别的字段。
+  final String? cookie;
+
+  const SessionShare({required this.userId, required this.token, this.cookie});
+
+  /// 只取 `JSESSIONID`：传输层后续请求就靠它维持会话
+  /// （见 `TitleApiService._captureCookiesFromResponse`）。
+  String? get jsessionid {
+    final raw = cookie;
+    if (raw == null) return null;
+    for (final part in raw.split(';')) {
+      final pair = part.trim();
+      final eq = pair.indexOf('=');
+      if (eq <= 0) continue;
+      if (pair.substring(0, eq).toUpperCase() != 'JSESSIONID') continue;
+      final value = pair.substring(eq + 1).trim();
+      return value.isEmpty ? null : 'JSESSIONID=$value';
+    }
+    return null;
+  }
+
+  bool get hasCookie => jsessionid != null;
+  bool get hasToken => token.isNotEmpty;
+
+  String encode() {
+    final map = <String, dynamic>{
+      'kind': _kind,
+      'version': _version,
+      'userId': userId,
+      'token': token,
+      'cookie': jsessionid,
+    };
+    return base64Encode(utf8.encode(jsonEncode(map)));
+  }
+
+  /// 不是连接信息时返回 `null`——登录页靠它区分 QR 令牌和会话快照。
+  static SessionShare? tryDecode(String input) {
+    var text = input.replaceAll(RegExp(r'\s'), '');
+    if (text.length < 16) return null;
+    final pad = text.length % 4;
+    if (pad != 0) text += '=' * (4 - pad);
+
+    try {
+      final decoded = jsonDecode(utf8.decode(base64Decode(text)));
+      if (decoded is! Map<String, dynamic>) return null;
+      if (decoded['kind'] != _kind) return null;
+      if ((decoded['version'] as num?)?.toInt() != _version) return null;
+
+      final share = SessionShare(
+        userId: (decoded['userId'] as num?)?.toInt() ?? 0,
+        token: decoded['token'] as String? ?? '',
+        cookie: decoded['cookie'] as String?,
+      );
+      // 两头都空的话这串信息什么都恢复不了。
+      if (share.userId <= 0 || (!share.hasCookie && !share.hasToken)) {
+        return null;
+      }
+      return share;
+    } catch (_) {
+      return null;
+    }
+  }
+}

lib/pages/about_page.dart

@@ -2,6 +2,8 @@ import 'package:flutter/material.dart';
 
 import '../config/responsive.dart';
 import '../config/strings.dart';
+import '../widgets/app_card.dart';
+import '../widgets/app_notice.dart';
 
 class AboutPage extends StatelessWidget {
   const AboutPage({super.key});
@@ -16,16 +18,20 @@ class AboutPage extends StatelessWidget {
         context,
         child: Column(
           children: [
-            const SizedBox(height: 32),
+            const SizedBox(height: 24),
-            Icon(Icons.qr_code_scanner, size: 64, color: theme.colorScheme.primary),
+            Icon(
-            const SizedBox(height: 16),
+              Icons.qr_code_scanner,
+              size: 56,
+              color: theme.colorScheme.primary,
+            ),
+            const SizedBox(height: 12),
             Text(
               AppStrings.aboutTitle,
               style: theme.textTheme.headlineSmall?.copyWith(
                 fontWeight: FontWeight.bold,
               ),
             ),
-            const SizedBox(height: 8),
+            const SizedBox(height: 6),
             Text(
               AppStrings.aboutDesc,
               style: theme.textTheme.bodyMedium?.copyWith(
@@ -33,35 +39,48 @@ class AboutPage extends StatelessWidget {
               ),
               textAlign: TextAlign.center,
             ),
-            const SizedBox(height: 24),
+            const SizedBox(height: 28),
-            Card(
+            AppCard(
-              elevation: 0,
-              shape: RoundedRectangleBorder(
-                borderRadius: BorderRadius.circular(16),
-                side: BorderSide(
-                  color: theme.colorScheme.outline.withValues(alpha: 0.3),
-                ),
-              ),
-              child: Padding(
-                padding: const EdgeInsets.all(20),
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
-                    Text(
+                  const SectionTitle(
-                      AppStrings.credits,
+                    icon: Icons.info_outline,
-                      style: theme.textTheme.labelLarge?.copyWith(
+                    title: AppStrings.aboutBasics,
-                        color: theme.colorScheme.primary,
-                        fontWeight: FontWeight.w600,
                   ),
+                  const SizedBox(height: 14),
+                  _row(theme, AppStrings.creditBuiltWith, 'Flutter'),
+                  _row(
+                    theme,
+                    AppStrings.aboutPlatforms,
+                    'Android · iOS · Windows · macOS · Linux',
                   ),
-                    const SizedBox(height: 12),
+                  _row(theme, AppStrings.aboutPackageId, 'dev.naominet.ichino'),
-                    _creditRow(theme, AppStrings.creditBuiltWith, 'Flutter'),
+                  _row(theme, AppStrings.creditLicense, 'MIT'),
-                    _creditRow(theme, AppStrings.creditQRDecode, 'jsQR (web)'),
-                    _creditRow(theme, AppStrings.creditIconAssets, 'assets2.lxns.net'),
-                    _creditRow(theme, AppStrings.creditLicense, 'MIT'),
                 ],
               ),
             ),
+            const SizedBox(height: 12),
+            AppCard(
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  const SectionTitle(
+                    icon: Icons.group_outlined,
+                    title: AppStrings.credits,
+                  ),
+                  const SizedBox(height: 14),
+                  _row(theme, AppStrings.creditProtocol, 'empurple · eaquira'),
+                  _row(theme, AppStrings.creditB50, 'Empurple'),
+                  _row(theme, AppStrings.creditQRDecode, '原生 MethodChannel'),
+                  _row(theme, AppStrings.creditIconAssets, 'assets2.lxns.net'),
+                ],
+              ),
+            ),
+            const SizedBox(height: 12),
+            const AppNotice(
+              AppStrings.aboutRiskNotice,
+              icon: Icons.warning_amber_rounded,
             ),
           ],
         ),
@@ -69,13 +88,14 @@ class AboutPage extends StatelessWidget {
     );
   }
 
-  Widget _creditRow(ThemeData theme, String label, String value) {
+  Widget _row(ThemeData theme, String label, String value) {
     return Padding(
       padding: const EdgeInsets.symmetric(vertical: 6),
       child: Row(
+        crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           SizedBox(
-            width: 120,
+            width: 104,
             child: Text(
               label,
               style: theme.textTheme.bodySmall?.copyWith(
@@ -83,9 +103,7 @@ class AboutPage extends StatelessWidget {
               ),
             ),
           ),
-          Expanded(
+          Expanded(child: Text(value, style: theme.textTheme.bodyMedium)),
-            child: Text(value, style: theme.textTheme.bodyMedium),
-          ),
         ],
       ),
     );

lib/pages/home_page.dart

@@ -10,23 +10,33 @@ import '../models/session_model.dart';
 import '../models/user_data.dart';
 import '../models/user_preview.dart';
 import '../services/title_api_service.dart';
+import '../widgets/app_notice.dart';
+import '../widgets/connection_share_card.dart';
 import 'about_page.dart';
 import 'best50_page.dart';
 import 'high_risk_feature_page.dart';
 import 'settings_page.dart';
 import 'ticket_page.dart';
 
-
 class HomePage extends StatefulWidget {
   final int userId;
   final String token;
   final bool forcePreviewApi;
 
+  /// 会话由登录页粘贴「连接信息」恢复而来：登录态（或 Cookie）已经是现成的，
+  /// 主页不要再发一次 UserLoginApi 去顶掉它。
+  final bool sessionRestored;
+
+  /// 恢复会话时验证 Cookie 顺手拉到的用户数据，直接展示、省一次请求。
+  final UserDataBean? initialUserData;
+
   const HomePage({
     super.key,
     required this.userId,
     required this.token,
     this.forcePreviewApi = false,
+    this.sessionRestored = false,
+    this.initialUserData,
   });
 
   @override
@@ -73,7 +83,19 @@ class _HomePageState extends State<HomePage> {
       _preview = null;
       _userData = null;
     });
-    _session.setGameLogin(null);
+
+    final seed = widget.initialUserData;
+    if (seed != null) {
+      // 恢复来的 JSESSIONID 已在 SessionModel._probeCookieSession 里验证过并
+      // 带回全量数据，这里直接展示，不再发 GetUserPreviewApi / UserLoginApi。
+      setState(() {
+        _userData = seed;
+        _loading = false;
+      });
+      return;
+    }
+
+    if (!widget.sessionRestored) _session.setGameLogin(null);
 
     final service = TitleApiService.fromHolder(cookies: _session.cookies)!;
 
@@ -88,19 +110,21 @@ class _HomePageState extends State<HomePage> {
 
       // isLogin == true => 已有人登录, 不再走完整登录, 直接展示 preview 概要
       // forcePreviewApi => 跳过 UserLoginApi, 仅展示 preview + Login 按钮
-      if (preview.isLogin || widget.forcePreviewApi) {
+      // 但恢复来的登录态就是自己这次会话，isLogin 为 true 不代表「别人在玩」。
+      final ownsLogin = _session.gameLogin != null;
+      if (!ownsLogin && (preview.isLogin || widget.forcePreviewApi)) {
         setState(() => _loading = false);
         return;
       }
 
-      await _session.loginGame(
+      if (!ownsLogin) {
-        userId: widget.userId,
+        await _session.loginGame(userId: widget.userId, token: widget.token);
-        token: widget.token,
-      );
         if (!mounted) return;
+      }
 
-      final userDataService =
+      final userDataService = TitleApiService.fromHolder(
-          TitleApiService.fromHolder(cookies: _session.cookies)!;
+        cookies: _session.cookies,
+      )!;
       final userData = await userDataService.getUserDataTyped(widget.userId);
       if (!mounted) return;
       _session.updateCookies(userDataService.cookies);
@@ -131,10 +155,7 @@ class _HomePageState extends State<HomePage> {
     });
 
     try {
-      await _session.loginGame(
+      await _session.loginGame(userId: widget.userId, token: widget.token);
-        userId: widget.userId,
-        token: widget.token,
-      );
       if (!mounted) return;
 
       final service = TitleApiService.fromHolder(cookies: _session.cookies)!;
@@ -170,7 +191,7 @@ class _HomePageState extends State<HomePage> {
   Future<void> _performLogoutAndExit() async {
     setState(() => _loggingOut = true);
     if (_session.gameLogin != null) {
-      await Future.delayed(const Duration(seconds: 5));
+      await Future.delayed(const Duration(seconds: 2));
       await _logoutSession();
     }
     _session.reset();
@@ -185,6 +206,9 @@ class _HomePageState extends State<HomePage> {
   /// 主页上的原生返回手势 = 结束应用。
   void _exitApp() {
     // iOS 不允许程序化退出，且根路由本来也没有返回手势。
+    if (_session.gameLogin != null) {
+      _logoutSession();
+    }
     if (Platform.isIOS) return;
     SystemNavigator.pop();
   }
@@ -227,15 +251,19 @@ class _HomePageState extends State<HomePage> {
                   userId: widget.userId,
                   cookies: _session.cookies,
                   loginDateTime: _session.gameLogin?.loginDateTime,
-                  playerRating: _userData?.playerRating ?? _preview?.playerRating ?? 0,
+                  playerRating:
-                  onLogoutRequested: _session.gameLogin != null ? _logoutSession : null,
+                      _userData?.playerRating ?? _preview?.playerRating ?? 0,
+                  onLogoutRequested: _session.gameLogin != null
+                      ? _logoutSession
+                      : null,
                 ),
                 Best50Page(
                   userId: widget.userId,
                   cookies: _session.cookies,
                   userName: _userData?.userName ?? _preview?.userName ?? '',
                   iconId: _userData?.iconId ?? _preview?.iconId ?? 0,
-                  playerRating: _userData?.playerRating ?? _preview?.playerRating ?? 0,
+                  playerRating:
+                      _userData?.playerRating ?? _preview?.playerRating ?? 0,
                 ),
                 HighRiskFeaturePage(
                   userId: widget.userId,
@@ -243,8 +271,9 @@ class _HomePageState extends State<HomePage> {
                   loginDateTime: _session.gameLogin?.loginDateTime,
                   loginId: _session.gameLogin?.loginId,
                   lastLoginDate: _session.gameLogin?.lastLoginDate,
-                  onExitToTitle:
+                  onExitToTitle: _session.gameLogin != null
-                      _session.gameLogin != null ? _performLogoutAndExit : null,
+                      ? _performLogoutAndExit
+                      : null,
                 ),
                 SettingsPage(showAppBar: false),
                 const AboutPage(),
@@ -254,12 +283,36 @@ class _HomePageState extends State<HomePage> {
               selectedIndex: _currentTab,
               onDestinationSelected: (i) => setState(() => _currentTab = i),
               destinations: const [
-                NavigationDestination(icon: Icon(Icons.home_outlined), selectedIcon: Icon(Icons.home), label: AppStrings.tabHome),
+                NavigationDestination(
-                NavigationDestination(icon: Icon(Icons.confirmation_number_outlined), selectedIcon: Icon(Icons.confirmation_number), label: AppStrings.tabTickets),
+                  icon: Icon(Icons.home_outlined),
-                NavigationDestination(icon: Icon(Icons.bar_chart_outlined), selectedIcon: Icon(Icons.bar_chart), label: AppStrings.tabBest50),
+                  selectedIcon: Icon(Icons.home),
-                NavigationDestination(icon: Icon(Icons.warning_outlined), selectedIcon: Icon(Icons.inventory_2), label: AppStrings.tabRisk),
+                  label: AppStrings.tabHome,
-                NavigationDestination(icon: Icon(Icons.settings_outlined), selectedIcon: Icon(Icons.settings), label: AppStrings.tabSettings),
+                ),
-                NavigationDestination(icon: Icon(Icons.info_outlined), selectedIcon: Icon(Icons.info), label: AppStrings.tabAbout),
+                NavigationDestination(
+                  icon: Icon(Icons.confirmation_number_outlined),
+                  selectedIcon: Icon(Icons.confirmation_number),
+                  label: AppStrings.tabTickets,
+                ),
+                NavigationDestination(
+                  icon: Icon(Icons.bar_chart_outlined),
+                  selectedIcon: Icon(Icons.bar_chart),
+                  label: AppStrings.tabBest50,
+                ),
+                NavigationDestination(
+                  icon: Icon(Icons.warning_outlined),
+                  selectedIcon: Icon(Icons.inventory_2),
+                  label: AppStrings.tabRisk,
+                ),
+                NavigationDestination(
+                  icon: Icon(Icons.settings_outlined),
+                  selectedIcon: Icon(Icons.settings),
+                  label: AppStrings.tabSettings,
+                ),
+                NavigationDestination(
+                  icon: Icon(Icons.info_outlined),
+                  selectedIcon: Icon(Icons.info),
+                  label: AppStrings.tabAbout,
+                ),
               ],
             ),
           ),
@@ -276,7 +329,11 @@ class _HomePageState extends State<HomePage> {
           child: Column(
             mainAxisSize: MainAxisSize.min,
             children: [
-              Icon(Icons.settings_ethernet, size: 64, color: theme.colorScheme.primary),
+              Icon(
+                Icons.settings_ethernet,
+                size: 64,
+                color: theme.colorScheme.primary,
+              ),
               const SizedBox(height: 16),
               Text(
                 AppStrings.titleServerNotConfigured,
@@ -313,7 +370,11 @@ class _HomePageState extends State<HomePage> {
           child: Column(
             mainAxisSize: MainAxisSize.min,
             children: [
-              Icon(Icons.error_outline, size: 48, color: theme.colorScheme.error),
+              Icon(
+                Icons.error_outline,
+                size: 48,
+                color: theme.colorScheme.error,
+              ),
               const SizedBox(height: 12),
               Text(AppStrings.loadFailed, style: theme.textTheme.titleMedium),
               const SizedBox(height: 8),
@@ -337,13 +398,18 @@ class _HomePageState extends State<HomePage> {
       );
     }
 
-    final preview = _preview;
     final userData = _userData;
+    if (userData != null) {
+      return _buildFullData(theme, _preview, userData);
+    }
+
+    final preview = _preview;
     if (preview == null) {
       return const SizedBox.shrink();
     }
 
-    if ((preview.isLogin || (widget.forcePreviewApi && _session.gameLogin == null)) && userData == null) {
+    if (preview.isLogin ||
+        (widget.forcePreviewApi && _session.gameLogin == null)) {
       return _buildPreviewOnly(
         theme,
         preview,
@@ -352,10 +418,6 @@ class _HomePageState extends State<HomePage> {
       );
     }
 
-    if (userData != null) {
-      return _buildFullData(theme, preview, userData);
-    }
-
     return const SizedBox.shrink();
   }
 
@@ -371,16 +433,21 @@ class _HomePageState extends State<HomePage> {
         context,
         child: Column(
           children: [
-            if (preview.errorId != 0) _ErrorIdBanner(theme: theme, errorId: preview.errorId),
+            if (preview.errorId != 0)
+              _ErrorIdBanner(theme: theme, errorId: preview.errorId),
             Container(
               width: double.infinity,
               padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
               decoration: BoxDecoration(
-                color: theme.colorScheme.tertiaryContainer.withValues(alpha: 0.4),
+                color: theme.colorScheme.tertiaryContainer.withValues(
+                  alpha: 0.4,
+                ),
                 borderRadius: BorderRadius.circular(10),
               ),
               child: Text(
-                showLoginButton ? 'Preview API 模式，点击下方按钮登录。' : AppStrings.inheritedAccountNotice,
+                showLoginButton
+                    ? 'Preview API 模式，点击下方按钮登录。'
+                    : AppStrings.inheritedAccountNotice,
                 style: theme.textTheme.bodySmall?.copyWith(
                   color: theme.colorScheme.onTertiaryContainer,
                 ),
@@ -399,7 +466,9 @@ class _HomePageState extends State<HomePage> {
                           child: CircularProgressIndicator(strokeWidth: 2),
                         )
                       : const Icon(Icons.login, size: 20),
-                  label: Text(_loading ? AppStrings.loggingIn : AppStrings.login),
+                  label: Text(
+                    _loading ? AppStrings.loggingIn : AppStrings.login,
+                  ),
                   style: FilledButton.styleFrom(
                     padding: const EdgeInsets.symmetric(vertical: 14),
                     shape: RoundedRectangleBorder(
@@ -419,6 +488,8 @@ class _HomePageState extends State<HomePage> {
                 _PreviewStatusCard(theme: theme, preview: preview),
               ],
             ),
+            const SizedBox(height: 12),
+            ConnectionShareCard(userId: widget.userId, token: widget.token),
             if (TitleApiService.lastRawResponse != null) ...[
               const SizedBox(height: 12),
               _DebugRawJsonCard(
@@ -434,7 +505,7 @@ class _HomePageState extends State<HomePage> {
 
   Widget _buildFullData(
     ThemeData theme,
-    UserPreviewDataBean preview,
+    UserPreviewDataBean? preview,
     UserDataBean data,
   ) {
     return SingleChildScrollView(
@@ -443,6 +514,11 @@ class _HomePageState extends State<HomePage> {
         context,
         child: Column(
           children: [
+            if (widget.sessionRestored && _session.gameLogin == null)
+              AppNotice(
+                AppStrings.sessionRestoredNotice,
+                icon: Icons.science_outlined,
+              ),
             _ProfileFromUserDataCard(theme: theme, data: data),
             const SizedBox(height: 12),
             ...responsiveGrid(
@@ -452,10 +528,16 @@ class _HomePageState extends State<HomePage> {
                 _FirstPlayCard(theme: theme, data: data),
                 _GameInfoFromUserDataCard(theme: theme, data: data),
                 _PlayStatsCard(theme: theme, data: data),
-                _StatusFromUserDataCard(theme: theme, preview: preview, data: data),
+                _StatusFromUserDataCard(
+                  theme: theme,
+                  preview: preview,
+                  data: data,
+                ),
                 _UserDataDetailCard(theme: theme, data: data),
               ],
             ),
+            const SizedBox(height: 12),
+            ConnectionShareCard(userId: widget.userId, token: widget.token),
             if (TitleApiService.lastRawResponse != null) ...[
               const SizedBox(height: 12),
               _DebugRawJsonCard(
@@ -486,7 +568,9 @@ class _ProfileFromPreviewCard extends StatelessWidget {
       elevation: 0,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(16),
-        side: BorderSide(color: theme.colorScheme.outline.withValues(alpha: 0.3)),
+        side: BorderSide(
+          color: theme.colorScheme.outline.withValues(alpha: 0.3),
+        ),
       ),
       child: Padding(
         padding: const EdgeInsets.all(20),
@@ -499,8 +583,12 @@ class _ProfileFromPreviewCard extends StatelessWidget {
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
                   Text(
-                    preview.userName.isEmpty ? AppStrings.unknownUser : preview.userName,
+                    preview.userName.isEmpty
-                    style: theme.textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
+                        ? AppStrings.unknownUser
+                        : preview.userName,
+                    style: theme.textTheme.titleLarge?.copyWith(
+                      fontWeight: FontWeight.bold,
+                    ),
                   ),
                   const SizedBox(height: 4),
                   Text(
@@ -554,7 +642,9 @@ class _PreviewStatusCard extends StatelessWidget {
       elevation: 0,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(16),
-        side: BorderSide(color: theme.colorScheme.outline.withValues(alpha: 0.3)),
+        side: BorderSide(
+          color: theme.colorScheme.outline.withValues(alpha: 0.3),
+        ),
       ),
       child: Padding(
         padding: const EdgeInsets.all(20),
@@ -601,7 +691,9 @@ class _ProfileFromUserDataCard extends StatelessWidget {
       elevation: 0,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(16),
-        side: BorderSide(color: theme.colorScheme.outline.withValues(alpha: 0.3)),
+        side: BorderSide(
+          color: theme.colorScheme.outline.withValues(alpha: 0.3),
+        ),
       ),
       child: Padding(
         padding: const EdgeInsets.all(20),
@@ -614,8 +706,12 @@ class _ProfileFromUserDataCard extends StatelessWidget {
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
                   Text(
-                    data.userName.isEmpty ? AppStrings.unknownUser : data.userName,
+                    data.userName.isEmpty
-                    style: theme.textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
+                        ? AppStrings.unknownUser
+                        : data.userName,
+                    style: theme.textTheme.titleLarge?.copyWith(
+                      fontWeight: FontWeight.bold,
+                    ),
                   ),
                   const SizedBox(height: 4),
                   Text(
@@ -701,7 +797,10 @@ class _GameInfoFromUserDataCard extends StatelessWidget {
         (AppStrings.lastLogin, data.lastLoginDate),
         (AppStrings.romVersion, data.lastRomVersion),
         (AppStrings.dataVersion, data.lastDataVersion),
-        (AppStrings.lastRegion, '${data.lastRegionName}${data.lastRegionId > 0 ? ' (${data.lastRegionId})' : ''}'),
+        (
+          AppStrings.lastRegion,
+          '${data.lastRegionName}${data.lastRegionId > 0 ? ' (${data.lastRegionId})' : ''}',
+        ),
       ],
     );
   }
@@ -732,7 +831,9 @@ class _PlayStatsCard extends StatelessWidget {
 
 class _StatusFromUserDataCard extends StatelessWidget {
   final ThemeData theme;
-  final UserPreviewDataBean preview;
+
+  /// 用连接信息（仅 JSESSIONID）恢复的会话没有走 GetUserPreviewApi，可为空。
+  final UserPreviewDataBean? preview;
   final UserDataBean data;
 
   const _StatusFromUserDataCard({
@@ -743,11 +844,15 @@ class _StatusFromUserDataCard extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final p = preview;
+
     return Card(
       elevation: 0,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(16),
-        side: BorderSide(color: theme.colorScheme.outline.withValues(alpha: 0.3)),
+        side: BorderSide(
+          color: theme.colorScheme.outline.withValues(alpha: 0.3),
+        ),
       ),
       child: Padding(
         padding: const EdgeInsets.all(20),
@@ -763,7 +868,7 @@ class _StatusFromUserDataCard extends StatelessWidget {
             ),
             const SizedBox(height: 14),
             _statusChip(theme, AppStrings.netMember, data.isNetMember),
-            _statusChip(theme, AppStrings.inherit, preview.isInherit),
+            if (p != null) _statusChip(theme, AppStrings.inherit, p.isInherit),
             _statusChip(
               theme,
               AppStrings.banState,
@@ -808,7 +913,9 @@ class _UserDataDetailCardState extends State<_UserDataDetailCard> {
       elevation: 0,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(16),
-        side: BorderSide(color: theme.colorScheme.outline.withValues(alpha: 0.3)),
+        side: BorderSide(
+          color: theme.colorScheme.outline.withValues(alpha: 0.3),
+        ),
       ),
       child: InkWell(
         borderRadius: BorderRadius.circular(16),
@@ -841,7 +948,11 @@ class _UserDataDetailCardState extends State<_UserDataDetailCard> {
                 _detailRow(theme, AppStrings.point, '${data.point}'),
                 _detailRow(theme, AppStrings.totalPoint, '${data.totalPoint}'),
                 _detailRow(theme, AppStrings.iconId, '${data.iconId}'),
-                _detailRow(theme, AppStrings.nameplateId, '${data.nameplateId}'),
+                _detailRow(
+                  theme,
+                  AppStrings.nameplateId,
+                  '${data.nameplateId}',
+                ),
                 _detailRow(theme, AppStrings.plateId, '${data.plateId}'),
                 _detailRow(theme, AppStrings.frameId, '${data.frameId}'),
                 _detailRow(theme, AppStrings.titleId, '${data.titleId}'),
@@ -872,9 +983,7 @@ class _UserDataDetailCardState extends State<_UserDataDetailCard> {
               ),
             ),
           ),
-          Expanded(
+          Expanded(child: Text(value, style: theme.textTheme.bodyMedium)),
-            child: Text(value, style: theme.textTheme.bodyMedium),
-          ),
         ],
       ),
     );
@@ -902,7 +1011,9 @@ class _SectionCard extends StatelessWidget {
       elevation: 0,
       shape: RoundedRectangleBorder(
         borderRadius: BorderRadius.circular(16),
-        side: BorderSide(color: theme.colorScheme.outline.withValues(alpha: 0.3)),
+        side: BorderSide(
+          color: theme.colorScheme.outline.withValues(alpha: 0.3),
+        ),
       ),
       child: Padding(
         padding: const EdgeInsets.all(20),
@@ -1021,10 +1132,7 @@ class _DebugRawJsonCard extends StatefulWidget {
   final ThemeData theme;
   final String rawJson;
 
-  const _DebugRawJsonCard({
+  const _DebugRawJsonCard({required this.theme, required this.rawJson});
-    required this.theme,
-    required this.rawJson,
-  });
 
   @override
   State<_DebugRawJsonCard> createState() => _DebugRawJsonCardState();
@@ -1076,8 +1184,9 @@ class _DebugRawJsonCardState extends State<_DebugRawJsonCard> {
                   width: double.infinity,
                   padding: const EdgeInsets.all(12),
                   decoration: BoxDecoration(
-                    color: theme.colorScheme.surfaceContainerHighest
+                    color: theme.colorScheme.surfaceContainerHighest.withValues(
-                        .withValues(alpha: 0.5),
+                      alpha: 0.5,
+                    ),
                     borderRadius: BorderRadius.circular(8),
                   ),
                   child: SelectableText(
@@ -1115,8 +1224,11 @@ class _ErrorIdBanner extends StatelessWidget {
       ),
       child: Row(
         children: [
-          Icon(Icons.warning_amber_rounded,
+          Icon(
-              size: 20, color: theme.colorScheme.onErrorContainer),
+            Icons.warning_amber_rounded,
+            size: 20,
+            color: theme.colorScheme.onErrorContainer,
+          ),
           const SizedBox(width: 10),
           Expanded(
             child: Text(

lib/pages/login_page.dart

@@ -3,12 +3,16 @@ import 'package:flutter/material.dart';
 import '../config/responsive.dart';
 import '../config/strings.dart';
 import '../models/session_model.dart';
+import '../models/session_share.dart';
 import '../services/file_picker_service.dart';
 import '../services/qr_service.dart';
+import '../widgets/app_notice.dart';
 import 'home_page.dart';
 import 'settings_page.dart';
 
 /// 登录页：粘贴 / 识别 QR 令牌，走 Aime 登录后进入主页。
+///
+/// 也接受主页导出的「连接信息」（实验性）：那是一串 Base64，直接续上原有会话。
 class LoginPage extends StatefulWidget {
   const LoginPage({super.key});
 
@@ -19,6 +23,7 @@ class LoginPage extends StatefulWidget {
 class _LoginPageState extends State<LoginPage> {
   final _qrController = TextEditingController();
   String _qrCode = '';
+  SessionShare? _share;
   bool _loading = false;
   bool _forcePreviewApi = false;
 
@@ -29,8 +34,10 @@ class _LoginPageState extends State<LoginPage> {
   }
 
   void _onQRContentChanged(String value) {
+    final text = value.trim();
     setState(() {
-      _qrCode = SessionModel.extractQRCode(value.trim());
+      _qrCode = SessionModel.extractQRCode(text);
+      _share = SessionShare.tryDecode(text);
     });
   }
 
@@ -45,6 +52,7 @@ class _LoginPageState extends State<LoginPage> {
         _qrController.text = result;
         setState(() {
           _qrCode = SessionModel.extractQRCode(result);
+          _share = SessionShare.tryDecode(result);
         });
         if (mounted) {
           ScaffoldMessenger.of(context).showSnackBar(
@@ -70,6 +78,7 @@ class _LoginPageState extends State<LoginPage> {
   Future<void> _onLogin() async {
     if (_qrCode.isEmpty) return;
 
+    if (_qrCode.startsWith("SGWCMAID")) {
       setState(() => _loading = true);
 
       try {
@@ -89,7 +98,11 @@ class _LoginPageState extends State<LoginPage> {
           );
         } else {
           ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('${AppStrings.loginFailed} (errorID: ${result.errorId})')),
+            SnackBar(
+              content: Text(
+                '${AppStrings.loginFailed} (errorID: ${result.errorId})',
+              ),
+            ),
           );
         }
       } catch (e) {
@@ -104,10 +117,46 @@ class _LoginPageState extends State<LoginPage> {
         }
       }
     }
+  }
+
+  /// 实验性：用主页导出的连接信息恢复会话。带可用 JSESSIONID 就直接续上那次登录，
+  /// 否则退回用令牌重新登录。
+  Future<void> _onRestoreSession() async {
+    final share = _share;
+    if (share == null) return;
+
+    setState(() => _loading = true);
+    try {
+      final result = await SessionModel.instance.restoreFromShare(share);
+      if (!mounted) return;
+      context.showSnack(
+        result.reusedCookie
+            ? AppStrings.sessionRestoreCookie
+            : AppStrings.sessionRestoreToken,
+      );
+      Navigator.of(context).push(
+        MaterialPageRoute(
+          builder: (_) => HomePage(
+            userId: share.userId,
+            token: share.token,
+            sessionRestored: true,
+            initialUserData: result.userData,
+          ),
+        ),
+      );
+    } catch (e) {
+      if (mounted) {
+        context.showSnack('${AppStrings.sessionRestoreFailed}: $e');
+      }
+    } finally {
+      if (mounted) setState(() => _loading = false);
+    }
+  }
 
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
+    final isRestore = _share != null;
 
     return Scaffold(
       appBar: AppBar(
@@ -117,9 +166,9 @@ class _LoginPageState extends State<LoginPage> {
             icon: const Icon(Icons.settings),
             tooltip: AppStrings.settingsTooltip,
             onPressed: () {
-              Navigator.of(context).push(
+              Navigator.of(
-                MaterialPageRoute(builder: (_) => const SettingsPage()),
+                context,
-              );
+              ).push(MaterialPageRoute(builder: (_) => const SettingsPage()));
             },
           ),
         ],
@@ -145,14 +194,7 @@ class _LoginPageState extends State<LoginPage> {
                     color: theme.colorScheme.primary,
                   ),
                 ),
-                const SizedBox(height: 8),
+                const SizedBox(height: 48),
-                Text(
-                  AppStrings.loginSubtitle,
-                  style: theme.textTheme.bodyMedium?.copyWith(
-                    color: theme.colorScheme.onSurfaceVariant,
-                  ),
-                ),
-                const SizedBox(height: 40),
 
                 Card(
                   elevation: 0,
@@ -194,6 +236,7 @@ class _LoginPageState extends State<LoginPage> {
                             letterSpacing: 0.5,
                           ),
                           decoration: InputDecoration(
+                            hintText: AppStrings.qrHint,
                             border: OutlineInputBorder(
                               borderRadius: BorderRadius.circular(10),
                             ),
@@ -205,40 +248,14 @@ class _LoginPageState extends State<LoginPage> {
                   ),
                 ),
 
-                if (_qrCode.isNotEmpty) ...[
-                  const SizedBox(height: 12),
-                  Container(
-                    width: double.infinity,
-                    padding: const EdgeInsets.all(12),
-                    decoration: BoxDecoration(
-                      color: theme.colorScheme.surfaceContainerHighest
-                          .withValues(alpha: 0.5),
-                      borderRadius: BorderRadius.circular(10),
-                    ),
-                    child: Column(
-                      crossAxisAlignment: CrossAxisAlignment.start,
-                      children: [
-                        Text(
-                          AppStrings.qrParsedResult,
-                          style: theme.textTheme.labelSmall?.copyWith(
-                            color: theme.colorScheme.onSurfaceVariant,
-                          ),
-                        ),
-                        const SizedBox(height: 6),
-                        Text(
-                          _qrCode,
-                          style: theme.textTheme.bodySmall?.copyWith(
-                            fontFamily: 'monospace',
-                            color: theme.colorScheme.onSurface,
-                          ),
-                        ),
-                      ],
-                    ),
-                  ),
-                ],
-
                 const SizedBox(height: 28),
 
+                if (isRestore)
+                  const AppNotice(
+                    AppStrings.sessionShareDetected,
+                    icon: Icons.science_outlined,
+                  ),
+
                 Row(
                   children: [
                     Expanded(
@@ -257,8 +274,11 @@ class _LoginPageState extends State<LoginPage> {
                     const SizedBox(width: 16),
                     Expanded(
                       child: FilledButton.icon(
-                        onPressed:
+                        onPressed: isRestore
-                            (_qrCode.isNotEmpty && !_loading) ? _onLogin : null,
+                            ? (_loading ? null : _onRestoreSession)
+                            : (_qrCode.isNotEmpty && !_loading)
+                            ? _onLogin
+                            : null,
                         icon: _loading
                             ? const SizedBox(
                                 width: 20,
@@ -268,8 +288,19 @@ class _LoginPageState extends State<LoginPage> {
                                   color: Colors.white,
                                 ),
                               )
-                            : const Icon(Icons.arrow_forward, size: 20),
+                            : Icon(
-                        label: Text(_loading ? AppStrings.loggingIn : AppStrings.login),
+                                isRestore ? Icons.link : Icons.arrow_forward,
+                                size: 20,
+                              ),
+                        label: Text(
+                          isRestore
+                              ? (_loading
+                                    ? AppStrings.restoringSession
+                                    : AppStrings.restoreSession)
+                              : (_loading
+                                    ? AppStrings.loggingIn
+                                    : AppStrings.login),
+                        ),
                         style: FilledButton.styleFrom(
                           padding: const EdgeInsets.symmetric(vertical: 14),
                           shape: RoundedRectangleBorder(
@@ -281,9 +312,11 @@ class _LoginPageState extends State<LoginPage> {
                   ],
                 ),
                 const SizedBox(height: 16),
+                if (!isRestore)
                   CheckboxListTile(
                     value: _forcePreviewApi,
-                  onChanged: (v) => setState(() => _forcePreviewApi = v ?? false),
+                    onChanged: (v) =>
+                        setState(() => _forcePreviewApi = v ?? false),
                     title: const Text(AppStrings.forcePreviewApi),
                     controlAffinity: ListTileControlAffinity.leading,
                     contentPadding: EdgeInsets.zero,

lib/widgets/connection_share_card.dart

@@ -0,0 +1,146 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart' show Clipboard, ClipboardData;
+
+import '../config/strings.dart';
+import '../models/session_model.dart';
+import '../models/session_share.dart';
+import 'app_card.dart';
+import 'app_notice.dart';
+
+/// 实验性：把当前会话打包成 Base64「连接信息」，在别的设备粘贴即可恢复。
+class ConnectionShareCard extends StatefulWidget {
+  final int userId;
+  final String token;
+
+  const ConnectionShareCard({
+    super.key,
+    required this.userId,
+    required this.token,
+  });
+
+  @override
+  State<ConnectionShareCard> createState() => _ConnectionShareCardState();
+}
+
+class _ConnectionShareCardState extends State<ConnectionShareCard> {
+  String? _encoded;
+
+  SessionShare get _share => SessionModel.instance.exportConnectionInfo(
+    userId: widget.userId,
+    token: widget.token,
+  );
+
+  Future<void> _copy() async {
+    final share = _share;
+    if (!share.hasCookie && !share.hasToken) {
+      context.showSnack(AppStrings.connectionShareEmpty);
+      return;
+    }
+
+    final text = share.encode();
+    await Clipboard.setData(ClipboardData(text: text));
+    if (!mounted) return;
+    setState(() => _encoded = text);
+    context.showSnack(AppStrings.connectionShareCopied);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+
+    return AppCard(
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Row(
+            children: [
+              Expanded(
+                child: SectionTitle(
+                  icon: Icons.link,
+                  title: AppStrings.connectionShareTitle,
+                ),
+              ),
+              const _ExperimentalBadge(),
+            ],
+          ),
+          const SizedBox(height: 10),
+          Text(
+            AppStrings.connectionShareDesc,
+            style: theme.textTheme.bodySmall?.copyWith(
+              color: theme.colorScheme.onSurfaceVariant,
+            ),
+          ),
+          const SizedBox(height: 14),
+          SizedBox(
+            width: double.infinity,
+            child: FilledButton.tonalIcon(
+              onPressed: _copy,
+              icon: const Icon(Icons.copy_all, size: 20),
+              label: const Text(AppStrings.connectionShareCopy),
+              style: FilledButton.styleFrom(
+                padding: const EdgeInsets.symmetric(vertical: 13),
+                shape: RoundedRectangleBorder(
+                  borderRadius: BorderRadius.circular(12),
+                ),
+              ),
+            ),
+          ),
+          if (_encoded != null) ...[
+            const SizedBox(height: 12),
+            Container(
+              width: double.infinity,
+              padding: const EdgeInsets.all(12),
+              decoration: BoxDecoration(
+                color: theme.colorScheme.surfaceContainerHighest.withValues(
+                  alpha: 0.5,
+                ),
+                borderRadius: BorderRadius.circular(8),
+              ),
+              child: SingleChildScrollView(
+                child: SelectableText(
+                  _encoded!,
+                  style: theme.textTheme.bodySmall?.copyWith(
+                    fontFamily: 'monospace',
+                    fontSize: 11,
+                  ),
+                ),
+              ),
+            ),
+            const SizedBox(height: 10),
+            Text(
+              AppStrings.connectionShareSecurity,
+              style: theme.textTheme.bodySmall?.copyWith(
+                color: theme.colorScheme.error,
+              ),
+            ),
+          ],
+        ],
+      ),
+    );
+  }
+}
+
+class _ExperimentalBadge extends StatelessWidget {
+  const _ExperimentalBadge();
+
+  @override
+  Widget build(BuildContext context) {
+    final theme = Theme.of(context);
+    final tint = theme.colorScheme.tertiary;
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
+      decoration: BoxDecoration(
+        color: tint.withValues(alpha: 0.14),
+        borderRadius: BorderRadius.circular(6),
+        border: Border.all(color: tint.withValues(alpha: 0.5)),
+      ),
+      child: Text(
+        AppStrings.experimentalBadge,
+        style: theme.textTheme.labelSmall?.copyWith(
+          color: tint,
+          fontWeight: FontWeight.w600,
+        ),
+      ),
+    );
+  }
+}

test/session_share_test.dart

@@ -0,0 +1,115 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:ichino/config/strings.dart';
+import 'package:ichino/models/session_model.dart';
+import 'package:ichino/models/session_share.dart';
+import 'package:ichino/widgets/connection_share_card.dart';
+
+void main() {
+  group('SessionShare', () {
+    test('编码后能解回同样的会话', () {
+      const share = SessionShare(
+        userId: 1234567,
+        token: 'SGWCMAIDABCDEF',
+        cookie: 'JSESSIONID=abc123DEF',
+      );
+
+      final decoded = SessionShare.tryDecode(share.encode());
+
+      expect(decoded, isNotNull);
+      expect(decoded!.userId, 1234567);
+      expect(decoded.token, 'SGWCMAIDABCDEF');
+      expect(decoded.jsessionid, 'JSESSIONID=abc123DEF');
+    });
+
+    test('只保留 JSESSIONID，忽略其它 Cookie', () {
+      const share = SessionShare(
+        userId: 1,
+        token: 't',
+        cookie: 'OTHER=x; JSESSIONID=keep-me; Path=/',
+      );
+
+      final decoded = SessionShare.tryDecode(share.encode())!;
+
+      expect(decoded.jsessionid, 'JSESSIONID=keep-me');
+    });
+
+    test('换行与空白不影响解析', () {
+      const share = SessionShare(
+        userId: 42,
+        token: 'tok',
+        cookie: 'JSESSIONID=z',
+      );
+      final wrapped =
+          '  ${share.encode().replaceAllMapped(RegExp(r'.{8}'), (m) => '${m[0]}\n')} ';
+
+      expect(SessionShare.tryDecode(wrapped)?.userId, 42);
+    });
+
+    test('QR 令牌与乱码不是连接信息', () {
+      final qrToken = 'SGWCMAID${'0123456789ABCDEF' * 3}01234567';
+      expect(qrToken.length, 64);
+      expect(SessionShare.tryDecode(qrToken), isNull);
+      expect(SessionShare.tryDecode('not base64 at all !!'), isNull);
+      expect(SessionShare.tryDecode(''), isNull);
+    });
+
+    test('cookie 与 token 都空、或 userId 非法时拒绝', () {
+      expect(
+        SessionShare.tryDecode(
+          const SessionShare(
+            userId: 0,
+            token: '',
+            cookie: 'JSESSIONID=x',
+          ).encode(),
+        ),
+        isNull,
+      );
+      expect(
+        SessionShare.tryDecode(
+          const SessionShare(userId: 7, token: '', cookie: null).encode(),
+        ),
+        isNull,
+      );
+    });
+  });
+
+  group('ConnectionShareCard', () {
+    Widget wrap(Widget child) => MaterialApp(
+      home: Scaffold(body: SingleChildScrollView(child: child)),
+    );
+
+    testWidgets('复制到剪贴板并展开 Base64 内容与外传警示', (tester) async {
+      final copied = <String>[];
+      TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+          .setMockMethodCallHandler(SystemChannels.platform, (call) async {
+            if (call.method == 'Clipboard.setData') {
+              copied.add(((call.arguments as Map)['text'] as String?) ?? '');
+            }
+            return null;
+          });
+      addTearDown(() {
+        TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+            .setMockMethodCallHandler(SystemChannels.platform, null);
+      });
+
+      await tester.pumpWidget(
+        wrap(const ConnectionShareCard(userId: 7, token: 'tok')),
+      );
+
+      expect(find.text(AppStrings.experimentalBadge), findsOneWidget);
+      expect(find.text(AppStrings.connectionShareSecurity), findsNothing);
+
+      await tester.tap(find.text(AppStrings.connectionShareCopy));
+      await tester.pump();
+
+      final encoded = SessionModel.instance
+          .exportConnectionInfo(userId: 7, token: 'tok')
+          .encode();
+      expect(copied, [encoded]);
+      expect(find.text(AppStrings.connectionShareSecurity), findsOneWidget);
+      expect(find.text(encoded), findsOneWidget);
+    });
+  });
+}