refactor: clean up parser and tests (#387)

* tests: improve coverage

* refactor: clean up nodes

* chore: lint

* feat(parser): ignore `BrandVideoShelf`

Seems to be used for ads.

* feat(parser): ignore `BrandVideoSingleton` too

src/parser/classes/menus/MenuServiceItem.ts

@@ -1,11 +1,10 @@
 import Button from '../Button.js';
 import type { RawNode } from '../../index.js';
-class MenuServiceItem extends Button {
+
+export default class MenuServiceItem extends Button {
   static type = 'MenuServiceItem';
 
   constructor(data: RawNode) {
     super(data);
   }
-}
-
-export default MenuServiceItem;
+}