feat(tts): multi-voice switcher for EN & RU, Irina default voice, punctuation pause normalization and speed calibration

app/static/js/modules/srs.js

@@ -111,6 +111,7 @@ export function initSrs() {
     const listeningLevelBadge = document.getElementById('listening-level-badge');
     const listeningTopicBadge = document.getElementById('listening-topic-badge');
     const listeningTopicSelect = document.getElementById('listening-topic-select');
+    const listeningVoiceSelect = document.getElementById('listening-voice-select');
     const listeningSpeedSelect = document.getElementById('listening-speed-select');
     const listeningNewScenarioBtn = document.getElementById('listening-new-scenario-btn');
     const listeningTitle = document.getElementById('listening-title');
@@ -715,8 +716,9 @@ export function initSrs() {
         if (listeningTitle) listeningTitle.textContent = 'Загрузка аудио-ситуации...';
 
         const topic = listeningTopicSelect ? listeningTopicSelect.value : 'all';
+        const voice = listeningVoiceSelect ? listeningVoiceSelect.value : (localStorage.getItem('notes_tts_voice_en') || 'en_US-lessac');
         try {
-            const data = await api.listening.getExercise(topic, 'B1');
+            const data = await api.listening.getExercise(topic, 'B1', voice);
             currentListeningExercise = data;
 
             if (listeningTitle) listeningTitle.textContent = data.title || 'Ситуация для аудирования';
@@ -788,6 +790,14 @@ export function initSrs() {
         });
     }
 
+    if (listeningVoiceSelect) {
+        listeningVoiceSelect.value = localStorage.getItem('notes_tts_voice_en') || 'en_US-lessac';
+        listeningVoiceSelect.addEventListener('change', () => {
+            localStorage.setItem('notes_tts_voice_en', listeningVoiceSelect.value);
+            loadListeningExercise(true);
+        });
+    }
+
     if (listeningForm) {
         listeningForm.addEventListener('submit', async (e) => {
             e.preventDefault();