feat(parser): Add mobile guide nodes

src/parser/classes/mweb/MobileTopbar.ts

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+import { YTNode } from '../../helpers.js';
+import Text from '../misc/Text.js';
+import { Parser, type RawNode } from '../../index.js';
+
+export default class MobileTopbar extends YTNode {
+  static type = 'MobileTopbar';
+
+  public placeholder_text: Text;
+  public buttons;
+  public logo_type?: string;
+
+  constructor(data: RawNode) {
+    super();
+    this.placeholder_text = new Text(data.placeholderText);
+    this.buttons = Parser.parseArray(data.buttons);
+
+    if (Reflect.has(data, 'logo') && Reflect.has(data.logo, 'iconType'))
+      this.logo_type = data.logo.iconType;
+  }
+}

src/parser/classes/mweb/MultiPageMenuSection.ts

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+import type { ObservedArray } from '../../helpers.js';
+import { YTNode } from '../../helpers.js';
+import { Parser, type RawNode } from '../../index.js';
+
+export default class MultiPageMenuSection extends YTNode {
+  static type = 'MultiPageMenuSection';
+
+  public items: ObservedArray<YTNode> | null;
+
+  constructor(data: RawNode) {
+    super();
+    this.items = Parser.parseArray(data.items);
+  }
+}

src/parser/classes/mweb/PivotBar.ts

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+import { YTNode } from '../../helpers.js';
+import { Parser, type RawNode } from '../../index.js';
+
+export default class PivotBar extends YTNode {
+  static type = 'PivotBar';
+
+  public items;
+
+  constructor(data: RawNode) {
+    super();
+    this.items = Parser.parseArray(data.items);
+  }
+}

src/parser/classes/mweb/PivotBarItem.ts

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+import { YTNode } from '../../helpers.js';
+import { type RawNode } from '../../index.js';
+import Text from '../misc/Text.js';
+import NavigationEndpoint from '../NavigationEndpoint.js';
+
+export default class PivotBarItem extends YTNode {
+  static type = 'PivotBarItem';
+
+  public pivot_identifier: string;
+  public endpoint: NavigationEndpoint;
+  public title: Text;
+  public accessibility_label?: string;
+  public icon_type?: string;
+
+  constructor(data: RawNode) {
+    super();
+    this.pivot_identifier = data.pivotIdentifier;
+    this.endpoint = new NavigationEndpoint(data.navigationEndpoint);
+    this.title = new Text(data.title);
+
+    if (Reflect.has(data, 'accessibility') && Reflect.has(data.accessibility, 'accessibilityData'))
+      this.accessibility_label = data.accessibility.accessibilityData.label;
+
+    if (Reflect.has(data, 'icon') && Reflect.has(data.icon, 'iconType'))
+      this.icon_type = data.icon.iconType;
+  }
+}

src/parser/classes/mweb/TopbarMenuButton.ts

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+import { YTNode } from '../../helpers.js';
+import { Parser, type RawNode } from '../../index.js';
+
+export default class TopbarMenuButton extends YTNode {
+  static type = 'TopbarMenuButton';
+
+  public icon_type?: string;
+  public menu_renderer: YTNode | null;
+  public target_id: string;
+
+  constructor(data: RawNode) {
+    super();
+    if (Reflect.has(data, 'icon') && Reflect.has(data.icon, 'iconType'))
+      this.icon_type = data.icon.iconType;
+    this.menu_renderer = Parser.parseItem(data.menuRenderer);
+    this.target_id = data.targetId;
+  }
+}