Method onFinished

app/src/utils/tutorialStreamCapture.ts:29–32

Fires once when the bar reaches 100% (from the live draw loop only, never a still frame).

(cb: () => void)

  /** Fires once when the bar reaches 100% (from the live draw loop only, never a still frame). */
  onFinished(cb: () => void): () => void {
    this.finishListeners.add(cb);
    return () => { this.finishListeners.delete(cb); };
  }

  /** Idempotent — returns the existing stream if one is already running. */
  createStream(): MediaStream {