feat: Add basic fullscreen support for iPhone (#1857)

- Closes #1444

tests/card-controller/fullscreen/factory.test.ts

@@ -0,0 +1,54 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { mock } from 'vitest-mock-extended';
+import { FullscreenProviderFactory } from '../../../src/card-controller/fullscreen/factory';
+import { ScreenfullFullScreenProvider } from '../../../src/card-controller/fullscreen/screenfull';
+import { WebkitFullScreenProvider } from '../../../src/card-controller/fullscreen/webkit';
+import { WebkitHTMLVideoElement } from '../../../src/types';
+import { createCardAPI, setScreenfulEnabled } from '../../test-utils';
+
+// @vitest-environment jsdom
+describe('FullscreenProviderFactory', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it('should return screenful when enabled', () => {
+    setScreenfulEnabled(true);
+
+    expect(FullscreenProviderFactory.create(createCardAPI(), vi.fn())).toBeInstanceOf(
+      ScreenfullFullScreenProvider,
+    );
+  });
+
+  it('should return webkit when enabled', () => {
+    setScreenfulEnabled(false);
+
+    const element = document.createElement('video') as HTMLVideoElement &
+      Partial<WebkitHTMLVideoElement>;
+    element['webkitEnterFullscreen'] = vi.fn();
+
+    const stubDocument = mock<Document>();
+    stubDocument.createElement.mockReturnValue(element);
+
+    vi.stubGlobal('document', stubDocument);
+
+    expect(FullscreenProviderFactory.create(createCardAPI(), vi.fn())).toBeInstanceOf(
+      WebkitFullScreenProvider,
+    );
+  });
+
+  it('should return null without any provider', () => {
+    setScreenfulEnabled(false);
+
+    const element = document.createElement('video') as HTMLVideoElement &
+      Partial<WebkitHTMLVideoElement>;
+    element['webkitEnterFullscreen'] = undefined;
+
+    const stubDocument = mock<Document>();
+    stubDocument.createElement.mockReturnValue(element);
+
+    vi.stubGlobal('document', stubDocument);
+
+    expect(FullscreenProviderFactory.create(createCardAPI(), vi.fn())).toBeNull();
+  });
+});