fix: render errores_det objects as readable text in historial

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

app/templates/envios_erp.html

@@ -425,7 +425,11 @@ async function cargarHistorialScheduler() {
                                     ${errDet.length ? `
                                     <div class="mb-3 bg-red-50 border border-red-200 rounded-lg px-3 py-2 text-xs text-red-700">
                                         <p class="font-medium mb-1"><i class="fas fa-exclamation-circle mr-1"></i>${errDet.length} error(es):</p>
-                                        <ul class="list-disc ml-4 space-y-0.5">${errDet.map(e => `<li>${e}</li>`).join('')}</ul>
+                                        <ul class="list-disc ml-4 space-y-0.5">${errDet.map(e =>
+                                            typeof e === 'object'
+                                                ? `<li><span class="font-mono text-red-400">${e.doc || ''}</span> ${e.nombre || ''} — ${e.msg || JSON.stringify(e)}</li>`
+                                                : `<li>${e}</li>`
+                                        ).join('')}</ul>
                                     </div>` : ''}
                                     <div class="max-h-96 overflow-y-auto space-y-2 text-xs">
                                         ${detHtml}