Add initial keyboard shortcut support.

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

@@ -0,0 +1,18 @@
+import { expect, it } from 'vitest';
+import { FullscreenAction } from '../../../../src/card-controller/actions/actions/fullscreen';
+import { createCardAPI } from '../../../test-utils';
+
+it('should handle fullscreen action', async () => {
+  const api = createCardAPI();
+  const action = new FullscreenAction(
+    {},
+    {
+      action: 'fire-dom-event',
+      frigate_card_action: 'fullscreen',
+    },
+  );
+
+  await action.execute(api);
+
+  expect(api.getFullscreenManager().toggleFullscreen).toBeCalled();
+});