feat(LIA): botón minimizar visible con ícono — / ▲ en header

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

modules/turnero/views/dashboard.php

@@ -347,6 +347,9 @@ try {
         <button id="btnTTS" class="btn-tts" onclick="event.stopPropagation();toggleTTS()" title="Activar/silenciar voz">
             <i class="fas fa-volume-up"></i>
         </button>
+        <button class="btn-tts" onclick="event.stopPropagation();minimizarIA(event)" title="Minimizar" id="btnMin">
+            <i class="fas fa-minus" id="iconMin"></i>
+        </button>
         <button class="btn-close" onclick="event.stopPropagation();toggleAI()"></button>
     </div>
     <div class="ai-body" id="aiBody">
@@ -777,9 +780,11 @@ function enviarRapido(pregunta) {
 }
 
 function minimizarIA(e) {
-    if (e.target.closest('button')) return;
+    if (e && e.target && e.target.closest && e.target.closest('button:not(#btnMin)')) return;
     _aiMinimized = !_aiMinimized;
     document.getElementById('aiPanel').classList.toggle('minimized', _aiMinimized);
+    const icon = document.getElementById('iconMin');
+    if (icon) icon.className = _aiMinimized ? 'fas fa-chevron-up' : 'fas fa-minus';
 }
 
 function _liaGreet() {