mod: home: show anonymous icon

Closes #81

opt: SliverPersistentHeaderDelegate

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/setting/privacy_setting.dart

@@ -79,10 +79,10 @@ class _PrivacySettingState extends State<PrivacySetting> {
               },
               leading: const Icon(Icons.privacy_tip_outlined),
               dense: false,
-              title: Text(MineController.anonymity ? '退出无痕模式' : '进入无痕模式',
+              title: Text(MineController.anonymity.value ? '退出无痕模式' : '进入无痕模式',
                   style: titleStyle),
               subtitle: Text(
-                MineController.anonymity
+                MineController.anonymity.value
                     ? '已进入无痕模式，搜索、观看视频/直播不携带Cookie与CSRF，其余操作不受影响'
                     : '未开启无痕模式，将使用账户信息提供完整服务',
                 style: subTitleStyle,