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

pubspec.yaml

@@ -215,6 +215,7 @@ dependencies:
   material_color_utilities: any
   flutter_cache_manager: any
 
+  http2: any
 dependency_overrides:
   screen_brightness: ^2.0.1
   path: ^1.9.1