feat: remove the "Voice Translated Speed" advanced option

Read-aloud speed is now controlled by the global Voice Speed plus the
per-language speed override only.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: ttop32

src/contentScript.js

@@ -877,11 +877,6 @@ function adjustAutoReaderSpeed(delta) {
   var key = "voiceRate";
   if (setting["ttsRate_" + tgt] && setting["ttsRate_" + tgt] !== "default") {
     key = "ttsRate_" + tgt;
-  } else if (
-    setting["voiceTranslatedRate"] &&
-    setting["voiceTranslatedRate"] !== "default"
-  ) {
-    key = "voiceTranslatedRate";
   }
   var rate = Number(setting[key]) || 1.0;
   rate = Math.min(2.0, Math.max(0.5, Math.round((rate + delta) * 10) / 10));

src/tts/index.js

@@ -63,15 +63,10 @@ export default class TTS {
     if (!text) {
       return;
     }
-    var isTranslateTargetLang = lang == setting["translateTarget"];
     var volume = Number(setting["voiceVolume"]);
     var rate = Number(setting["voiceRate"]);
-    rate =
-      isTranslateTargetLang && setting["voiceTranslatedRate"] != "default"
-        ? Number(setting["voiceTranslatedRate"])
-        : rate;
     // per-language read-aloud speed override (#195, #210): if the user set a
-    // speed for this specific language, it wins over the global / translated rate.
+    // speed for this specific language, it wins over the global rate.
     var langRate = setting?.["ttsRate_" + lang];
     if (langRate != null && langRate !== "default") {
       rate = Number(langRate);

src/util/setting_default.js

@@ -687,12 +687,6 @@ export var settingDict = {
     optionList: dictionarySourceList,
     settingTab: "advanced",
   },
-  voiceTranslatedRate: {
-    default: "default",
-    i18nKey: "Voice_Translated_Speed",
-    optionList: voiceRateListWithDefault,
-    settingTab: "advanced",
-  },
   fallbackTranslatorEngine: {
     default: "true",
     i18nKey: "Fallback_Translator_Engine",