tweaks (#1142)

* opt: unused layout

* mod: semantics

* opt: DanmakuMsg type

* opt: avoid cast

* opt: unnecessary_lambdas

* opt: use isEven

* opt: logger

* opt: invalid common page

* tweak

* opt: unify DynController

lib/models_new/video/video_shot/data.dart

@@ -29,6 +29,6 @@ class VideoShotData {
     image: (json["image"] as List)
         .map((e) => (e as String).http2https)
         .toList(),
-    index: (json["index"] as List).cast(),
+    index: (json["index"] as List).fromCast(),
   );
 }