🔊 TTS Ouvir: botão em cada resposta da Kemily com Speech Synthesis nativo

public/app.js

@@ -90,6 +90,7 @@ document.addEventListener('DOMContentLoaded', () => {
   let isGenerating = false;
   let searchQuery = '';
   let activeTag = 'all';
+  let currentUtterance = null; // para controlar TTS em andamento
 
   // Variáveis de Reconhecimento de Voz
   let recognition = null;
@@ -216,6 +217,90 @@ document.addEventListener('DOMContentLoaded', () => {
     }
   });
 
+  // ==========================================================================
+  // TTS — Speech Synthesis (ouvir respostas)
+  // ==========================================================================
+
+  // Carregar vozes disponíveis (pode ser assíncrono em alguns navegadores)
+  const loadVoices = () => {
+    return new Promise((resolve) => {
+      const voices = window.speechSynthesis.getVoices();
+      if (voices.length > 0) {
+        resolve(voices);
+      } else {
+        window.speechSynthesis.addEventListener('voiceschanged', () => {
+          resolve(window.speechSynthesis.getVoices());
+        }, { once: true });
+      }
+    });
+  };
+
+  let cachedVoices = [];
+  loadVoices().then(voices => { cachedVoices = voices; });
+
+  // Escolher melhor voz feminina brasileira disponível
+  const getBestBRVoice = () => {
+    const brVoices = cachedVoices.filter(v => v.lang.includes('pt'));
+    // Prioridade: feminina > masculino, local > remote
+    const female = brVoices.find(v =>
+      /female|brasil|maria|luciana|fernanda|virtual/i.test(v.name)
+    );
+    if (female) return female;
+    // fallback: qualquer voz brasileira
+    const brazil = brVoices.find(v => /brasil|brazil|pt-BR/i.test(v.lang));
+    if (brazil) return brazil;
+    // fallback: qualquer voz portuguesa
+    return brVoices[0] || null;
+  };
+
+  // Falar texto com TTS nativo
+  const speakText = (text, btn) => {
+    // Se já está falando, parar
+    if (window.speechSynthesis.speaking) {
+      window.speechSynthesis.cancel();
+      if (btn) {
+        btn.classList.remove('speaking');
+        const span = btn.querySelector('span');
+        if (span) span.textContent = 'Ouvir';
+      }
+      return;
+    }
+
+    // Limpar markdown básico antes de falar
+    const clean = text
+      .replace(/```[\s\S]*?```/g, 'trecho de código ignorado')
+      .replace(/`[^`]+`/g, '')
+      .replace(/[*_#~\[\]]/g, '')
+      .replace(/\n+/g, ' ')
+      .trim();
+
+    const utterance = new window.SpeechSynthesisUtterance(clean);
+    utterance.lang = 'pt-BR';
+    utterance.rate = 0.95;
+    utterance.pitch = 1.05;
+
+    const voice = getBestBRVoice();
+    if (voice) utterance.voice = voice;
+
+    utterance.onstart = () => {
+      if (btn) {
+        btn.classList.add('speaking');
+        const span = btn.querySelector('span');
+        if (span) span.textContent = 'Parar';
+      }
+    };
+
+    utterance.onend = utterance.onerror = () => {
+      if (btn) {
+        btn.classList.remove('speaking');
+        const span = btn.querySelector('span');
+        if (span) span.textContent = 'Ouvir';
+      }
+    };
+
+    window.speechSynthesis.speak(utterance);
+  };
+
   // ==========================================================================
   // ATALHOS DE TECLADO
   // ==========================================================================
@@ -519,6 +604,12 @@ document.addEventListener('DOMContentLoaded', () => {
           </svg>
           <span>Regenerar</span>
         </button>
+        <button class="msg-action-btn btn-speak" title="Ouvir resposta" data-content="${escapeHtml(content).replace(/"/g, '&quot;')}">
+          <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor">
+            <path stroke-linecap="round" stroke-linejoin="round" d="M19.114 5.636a9 9 0 0 1 0 12.728M16.463 8.288a5.25 5.25 0 0 1 0 7.424M6.75 8.25l4.72-4.72a.75.75 0 0 1 1.28.53v15.88a.75.75 0 0 1-1.28.53l-4.72-4.72H4.51c-.88 0-1.704-.507-1.938-1.354A9.009 9.009 0 0 1 2.25 12c0-.83.112-1.633.322-2.396C2.806 8.756 3.63 8.25 4.51 8.25H6.75Z" />
+          </svg>
+          <span>Ouvir</span>
+        </button>
       </div>
     ` : `
       <div class="message-actions">
@@ -602,6 +693,15 @@ document.addEventListener('DOMContentLoaded', () => {
       });
     }
 
+    // Event listener para ouvir resposta (TTS nativo)
+    const speakBtn = row.querySelector('.btn-speak');
+    if (speakBtn) {
+      speakBtn.addEventListener('click', () => {
+        const text = speakBtn.dataset.content;
+        speakText(text, speakBtn);
+      });
+    }
+
     // Event listener para regenerar resposta
     const regenBtn = row.querySelector('.btn-regenerate');
     if (regenBtn) {