Method getAudioBufferPersistent

src/monogatari.ts:1150–1152

* Retrieve a decoded AudioBuffer from persistent storage (IndexedDB) * @param key - Cache key (e.g., 'music/theme') * @returns The AudioBuffer if found, undefined otherwise

(key: string)

   * @returns The AudioBuffer if found, undefined otherwise
   */
  static async getAudioBufferPersistent(key: string): Promise<AudioBuffer | undefined> {
    return _getAudioBufferPersistent(this.asEngine(), key);
  }

  /**
   * Remove an AudioBuffer from persistent storage (IndexedDB)