fix: group terceros by cedula not fecha-as-factura

For terceros, _guardar_envio stores the automation date in the factura
field (not a patient id), so COALESCE(factura, cedula) still collapsed
all terceros into one row. Now GROUP BY uses cedula for tipo=terceros
and factura for transaccion/ventas. Template hides the date in the
factura column for terceros rows.

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

app/routes/logs.py

@@ -236,8 +236,8 @@ async def resumen_page(
             END AS estado_final
         FROM envios
         WHERE DATE(created_at) = ? {where_extra}
-        GROUP BY COALESCE(NULLIF(factura, ''), cedula), tipo
-        ORDER BY estado_final, tipo, COALESCE(factura, cedula)
+        GROUP BY CASE WHEN tipo = 'terceros' THEN cedula ELSE factura END, tipo
+        ORDER BY estado_final, tipo, CASE WHEN tipo = 'terceros' THEN cedula ELSE factura END
     """, params_q).fetchall()
 
     conn.close()

app/templates/resumen.html

@@ -98,7 +98,7 @@
                             {{ r.tipo }}
                         </span>
                     </td>
-                    <td class="px-2 py-2.5 text-gray-700 font-medium">{{ r.factura or '—' }}</td>
+                    <td class="px-2 py-2.5 text-gray-700 font-medium">{{ '—' if r.tipo == 'terceros' else (r.factura or '—') }}</td>
                     <td class="px-2 py-2.5 text-gray-500 font-mono">{{ r.idrecepcion or '—' }}</td>
                     <td class="px-2 py-2.5 text-gray-500">{{ r.contrato or '—' }}</td>
                     <td class="px-2 py-2.5 text-gray-500 font-mono">{{ r.cedula or '—' }}</td>