refactor: Cookie-based session fixes and minor additions (#821)

* (fix) `on_behalf_of_user` arg not applied

* (feat) `AccountManager#getInfo()`: Add option to fetch full accounts list

src/parser/classes/actions/UpdateChannelSwitcherPageAction.ts

@@ -0,0 +1,20 @@
+import type { ObservedArray } from '../../helpers.js';
+import { YTNode } from '../../helpers.js';
+import { Parser, type RawNode } from '../../index.js';
+import ChannelSwitcherPage from '../ChannelSwitcherPage.js';
+
+export default class UpdateChannelSwitcherPageAction extends YTNode {
+  static type = 'UpdateChannelSwitcherPageAction';
+
+  public header?: YTNode;
+  public contents?: ObservedArray<YTNode> | null;
+
+  constructor(data: RawNode) {
+    super();
+    const page = Parser.parseItem(data.page, ChannelSwitcherPage);
+    if (page) {
+      this.header = page.header;
+      this.contents = page.contents;
+    }
+  }
+}