feat: 调整设置，支持导入导出，代码优化

lib/pages/setting/play_setting.dart

@@ -65,30 +65,35 @@ class _PlaySettingState extends State<PlaySetting> {
           const SetSwitchItem(
             title: '弹幕开关',
             subTitle: '是否展示弹幕',
+            leading: Icon(Icons.comment_outlined),
             setKey: SettingBoxKey.enableShowDanmaku,
             defaultVal: false,
           ),
           ListTile(
             dense: false,
             onTap: () => Get.toNamed('/playSpeedSet'),
+            leading: const Icon(Icons.speed_outlined),
             title: Text('倍速设置', style: titleStyle),
             subtitle: Text('设置视频播放速度', style: subTitleStyle),
           ),
           const SetSwitchItem(
             title: '自动播放',
             subTitle: '进入详情页自动播放',
+            leading: Icon(Icons.motion_photos_auto_outlined),
             setKey: SettingBoxKey.autoPlayEnable,
             defaultVal: true,
           ),
           const SetSwitchItem(
             title: '双击快退/快进',
             subTitle: '左侧双击快退，右侧双击快进',
+            leading: Icon(Icons.touch_app_outlined),
             setKey: SettingBoxKey.enableQuickDouble,
             defaultVal: true,
           ),
           ListTile(
             dense: false,
             title: Text('自动启用字幕', style: titleStyle),
+            leading: const Icon(Icons.closed_caption_outlined),
             subtitle: Text(
                 '当前选择偏好：'
                 '${SubtitlePreferenceCode.fromCode(defaultSubtitlePreference)!.description}',
@@ -116,30 +121,35 @@ class _PlaySettingState extends State<PlaySetting> {
           const SetSwitchItem(
             title: '竖屏扩大展示',
             subTitle: '小屏竖屏视频宽高比由16:9扩大至4:5（！暂不支持临时收起）',
+            leading: Icon(Icons.expand_outlined),
             setKey: SettingBoxKey.enableVerticalExpand,
             defaultVal: false,
           ),
           const SetSwitchItem(
             title: '自动全屏',
             subTitle: '视频开始播放时进入全屏',
+            leading: Icon(Icons.fullscreen_outlined),
             setKey: SettingBoxKey.enableAutoEnter,
             defaultVal: false,
           ),
           const SetSwitchItem(
             title: '自动退出全屏',
             subTitle: '视频结束播放时退出全屏',
+            leading: Icon(Icons.fullscreen_exit_outlined),
             setKey: SettingBoxKey.enableAutoExit,
             defaultVal: true,
           ),
           const SetSwitchItem(
             title: '全向旋转',
-            subTitle: '非全屏时可受重力转为临时全屏，若系统锁定旋转仍异常触发请关闭，无异常可保持开启',
+            subTitle: '小屏可受重力转为临时全屏，若系统锁定旋转仍触发请关闭，关闭会影响横屏适配',
+            leading: Icon(Icons.screen_rotation_alt_outlined),
             setKey: SettingBoxKey.allowRotateScreen,
             defaultVal: true,
           ),
           const SetSwitchItem(
             title: '后台播放',
             subTitle: '进入后台时继续播放',
+            leading: Icon(Icons.motion_photos_pause_outlined),
             setKey: SettingBoxKey.continuePlayInBackground,
             defaultVal: true,
           ),
@@ -147,6 +157,7 @@ class _PlaySettingState extends State<PlaySetting> {
             SetSwitchItem(
                 title: '后台画中画',
                 subTitle: '进入后台时以小窗形式（PiP）播放',
+                leading: const Icon(Icons.picture_in_picture_outlined),
                 setKey: SettingBoxKey.autoPiP,
                 defaultVal: false,
                 callFn: (val) {
@@ -160,26 +171,30 @@ class _PlaySettingState extends State<PlaySetting> {
             const SetSwitchItem(
               title: '画中画不加载弹幕',
               subTitle: '当弹幕开关开启时，小窗屏蔽弹幕以获得较好的体验',
+              leading: Icon(Icons.comments_disabled_outlined),
               setKey: SettingBoxKey.pipNoDanmaku,
               defaultVal: true,
             ),
           const SetSwitchItem(
             title: '全屏手势反向',
             subTitle: '默认播放器中部向上滑动进入全屏，向下退出\n开启后向下全屏，向上退出',
+            leading: Icon(Icons.swap_vert_outlined),
             setKey: SettingBoxKey.fullScreenGestureReverse,
             defaultVal: false,
           ),
           const SetSwitchItem(
             title: '观看人数',
             subTitle: '展示同时在看人数',
+            leading: Icon(Icons.people_outlined),
             setKey: SettingBoxKey.enableOnlineTotal,
             defaultVal: false,
           ),
           ListTile(
             dense: false,
-            title: Text('默认全屏方式', style: titleStyle),
+            title: Text('默认全屏方向', style: titleStyle),
+            leading: const Icon(Icons.open_with_outlined),
             subtitle: Text(
-              '当前全屏方式：${FullScreenModeCode.fromCode(defaultFullScreenMode)!.description}',
+              '当前全屏方向：${FullScreenModeCode.fromCode(defaultFullScreenMode)!.description}',
               style: subTitleStyle,
             ),
             onTap: () async {
@@ -187,7 +202,7 @@ class _PlaySettingState extends State<PlaySetting> {
                 context: context,
                 builder: (context) {
                   return SelectDialog<int>(
-                      title: '默认全屏方式',
+                      title: '默认全屏方向',
                       value: defaultFullScreenMode,
                       values: FullScreenMode.values.map((e) {
                         return {'title': e.description, 'value': e.code};
@@ -204,6 +219,7 @@ class _PlaySettingState extends State<PlaySetting> {
           ListTile(
             dense: false,
             title: Text('底部进度条展示', style: titleStyle),
+            leading: const Icon(Icons.border_bottom_outlined),
             subtitle: Text(
               '当前展示方式：${BtmProgresBehaviorCode.fromCode(defaultBtmProgressBehavior)!.description}',
               style: subTitleStyle,
@@ -230,6 +246,7 @@ class _PlaySettingState extends State<PlaySetting> {
           const SetSwitchItem(
             title: '后台音频服务',
             subTitle: '避免画中画没有播放暂停功能',
+            leading: Icon(Icons.volume_up_outlined),
             setKey: SettingBoxKey.enableBackgroundPlay,
             defaultVal: true,
           ),