useMediaURL

Resolve the lazy MediaBase.objectURL promise into a string suitable for direct use in <audio src> / <img src> / <video src> / <a href download>. Returns undefined until the URL is available.

Lifecycle:

• On mount (or when media changes) the hook awaits media.objectURL, then commits the resolved string to state.
• On unmount (or when media changes) the hook calls media.revoke() to free the object URL slot. The next consumer that accesses media.objectURL mints a fresh URL from the same Blob, so live re-renders just work.
• If the underlying handle errored before settling, the promise rejects and useMediaURL stays at undefined. Inspect media.error to surface the failure.

Pair with useAudio / useImages / useVideo / useFiles to bridge SDK media handles into React DOM nodes without manual URL.createObjectURL bookkeeping.