v1.2.4 - Lightbox para visualizar imágenes en Chat Assistant

FRONTEND:
- Implementado visor de imágenes (lightbox) dentro del modal de chat
- Click en imagen abre pantalla completa en lugar de nueva pestaña
- Fondo negro translúcido (95%) con z-index 200
- Botón de cerrar (×) en esquina superior derecha
- Click en imagen/fondo cierra el lightbox
- Etiqueta flotante con nombre de archivo
- Cursor zoom-in en miniaturas para indicar ampliación
- Responsive: max 95vw/95vh con scroll automático
- Frontend v1.2.4

BACKEND:
- Sin cambios (v1.1.1)

frontend/src/App.jsx

@@ -5457,6 +5457,7 @@ function InspectionModal({ checklist, existingInspection, user, onClose, onCompl
 function AIAssistantChatModal({ question, inspection, allAnswers, messages, setMessages, loading, setLoading, onClose }) {
   const [inputMessage, setInputMessage] = useState('')
   const [attachedFiles, setAttachedFiles] = useState([])
+  const [selectedImage, setSelectedImage] = useState(null) // Para lightbox
   const chatEndRef = useRef(null)
   const fileInputRef = useRef(null)
   const config = question.options || {}
@@ -5715,8 +5716,8 @@ function AIAssistantChatModal({ question, inspection, allAnswers, messages, setM
                             <img 
                               src={file.preview} 
                               alt={file.name}
-                              className="rounded-lg max-w-full h-auto max-h-64 object-contain cursor-pointer hover:opacity-90 transition"
-                              onClick={() => window.open(file.preview, '_blank')}
+                              className="rounded-lg max-w-full h-auto max-h-64 object-contain cursor-zoom-in hover:opacity-90 transition"
+                              onClick={() => setSelectedImage({ url: file.preview, name: file.name })}
                             />
                             <div className={`text-xs flex items-center gap-1 ${msg.role === 'user' ? 'text-blue-100' : 'text-gray-500'}`}>
                               <span>🖼️</span>
@@ -5850,6 +5851,35 @@ function AIAssistantChatModal({ question, inspection, allAnswers, messages, setM
             </p>
           )}
         </div>
+
+        {/* Lightbox para visualizar imágenes */}
+        {selectedImage && (
+          <div 
+            className="fixed inset-0 bg-black/95 z-[200] flex items-center justify-center p-4"
+            onClick={() => setSelectedImage(null)}
+          >
+            <button
+              onClick={() => setSelectedImage(null)}
+              className="absolute top-4 right-4 text-white/80 hover:text-white text-4xl font-bold z-10 bg-black/50 rounded-full w-12 h-12 flex items-center justify-center"
+            >
+              ×
+            </button>
+            <div className="relative max-w-[95vw] max-h-[95vh] overflow-auto">
+              <img 
+                src={selectedImage.url} 
+                alt={selectedImage.name}
+                className="max-w-full max-h-[95vh] object-contain cursor-zoom-out"
+                onClick={(e) => {
+                  e.stopPropagation()
+                  setSelectedImage(null)
+                }}
+              />
+              <div className="absolute bottom-4 left-1/2 transform -translate-x-1/2 bg-black/70 text-white px-4 py-2 rounded-lg text-sm">
+                🖼️ {selectedImage.name}
+              </div>
+            </div>
+          </div>
+        )}
       </div>
     </div>
   )