function speakWithRegisteredEngine(){
      const _opts={
        voice: localStorage.getItem("hermes-tts-voice")||'',
        rate: parseFloat(localStorage.getItem("hermes-tts-rate")),
      };
      return _opts;
}
function speakWithEdge(clean){
      const voice=localStorage.getItem("hermes-tts-voice")||"zh-CN-XiaoxiaoNeural";
      const rate='';
      const pitch='';
      return fetch('/api/tts', {
        body: JSON.stringify({text: clean, voice, rate, pitch})
      });
}
function speakWithBrowser(clean){
    const utter=new SpeechSynthesisUtterance(clean);
    const savedVoice=localStorage.getItem('hermes-tts-voice');
    const voices=speechSynthesis.getVoices();
    if(savedVoice&&voices.length){
      const match=voices.find(v=>v.name===savedVoice);
      if(match) utter.voice=match;
    }
    return utter;
}
function _mirrorSpeechSettingsFromServer(s){
  const defaults={
    tts_voice:'',
  };
  [
    ['tts_voice','hermes-tts-voice'],
  ].forEach(([settingKey,storageKey])=>localStorage.setItem(storageKey,s[settingKey]));
  return defaults;
}