feat(media)!: add Google Cast by default to HLS, DASH media (#1661)

packages/react/src/utils/use-media-instance.ts

@@ -12,16 +12,25 @@ import { useDestroy } from './use-destroy';
  * Instantiates the media class once, attaches it to the player on mount,
  * and safely detaches on unmount using a functional updater to avoid race
  * conditions when swapping media components (e.g. DashVideo → HlsVideo).
+ *
+ * An optional `setup` callback runs once on mount — e.g. to add media
+ * components via `addComponent`. Components registered there are destroyed
+ * together with the media instance on unmount (`media.destroy()` destroys
+ * all of its registered components).
  */
 export function useMediaInstance<Instance extends Media & { destroy(): void }>(
-  MediaClass: new () => Instance
+  MediaClass: new () => Instance,
+  setup?: (media: Instance) => void
 ): Instance {
   const [instance] = useState(() => new MediaClass());
   const setMedia = useMediaAttach();
 
   useDestroy(
     instance,
-    () => setMedia?.(instance),
+    () => {
+      setup?.(instance);
+      setMedia?.(instance);
+    },
     () => setMedia?.((prev) => (prev === instance ? null : prev))
   );