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

- Closes #1444

src/components/live/providers/jsmpeg.ts

@@ -17,6 +17,7 @@ import liveJSMPEGStyle from '../../../scss/live-jsmpeg.scss';
 import {
   ExtendedHomeAssistant,
   FrigateCardMediaPlayer,
+  FullscreenElement,
   Message,
 } from '../../../types.js';
 import { convertEndpointAddressToSignedWebsocket } from '../../../utils/endpoint.js';
@@ -101,6 +102,10 @@ export class FrigateCardLiveJSMPEG extends LitElement implements FrigateCardMedi
     return this._jsmpegCanvasElement?.toDataURL('image/jpeg') ?? null;
   }
 
+  public getFullscreenElement(): FullscreenElement | null {
+    return this._jsmpegCanvasElement ?? null;
+  }
+
   protected willUpdate(changedProperties: PropertyValues): void {
     if (
       ['cameraConfig', 'cameraEndpoints'].some((prop) => changedProperties.has(prop))