mod: 侧边栏、动态重构，排行改为首页分区，平板、折叠屏、竖屏视频新适配，播放页可隐藏黑边、截图、点踩，弹幕粗细调整，默认关闭后台播放，弹窗接受返回

lib/models/common/nav_bar_config.dart

@@ -5,30 +5,17 @@ List defaultNavigationBars = [
     'id': 0,
     'icon': const Icon(
       Icons.home_outlined,
-      size: 21,
+      size: 23,
     ),
     'selectIcon': const Icon(
       Icons.home,
-      size: 21,
+      size: 23,
     ),
     'label': "首页",
     'count': 0,
   },
   {
     'id': 1,
-    'icon': const Icon(
-      Icons.leaderboard_outlined,
-      size: 21,
-    ),
-    'selectIcon': const Icon(
-      Icons.leaderboard,
-      size: 21,
-    ),
-    'label': "排行榜",
-    'count': 0,
-  },
-  {
-    'id': 2,
     'icon': const Icon(
       Icons.motion_photos_on_outlined,
       size: 21,
@@ -41,7 +28,7 @@ List defaultNavigationBars = [
     'count': 0,
   },
   {
-    'id': 3,
+    'id': 2,
     'icon': const Icon(
       Icons.video_collection_outlined,
       size: 20,