Board Fees Management

- The student does NOT reserve a specific horse
- A school horse is assigned for each class
- No additional configuration required

- The student reserves a specific school horse
- Must configure:
  - Board fee amount: Full / Half / Third
  - Horse: Select from "ESCUELA" type horses

- The student has their own horse
- Must configure:
  - Board fee amount: Full / Half / Third  
  - Horse: Select from "PRIVADO" type horses

### Horse Data:
- **Name**: Horse's name
- **Type**: 
  - **School**: School property, available to all
  - **Private**: Belongs to specific student
- **Available**: Automatically set as available for classes

### Automatic Association:
Once registered, the horse is automatically associated with the student:
- If **own horse**: linked as owner
- If **school reserve**: linked as reservation

enum TipoPension {
  SIN_CABALLO = "SIN_CABALLO",      // No assigned horse
  RESERVA_ESCUELA = "RESERVA_ESCUELA", // School horse reserved
  CABALLO_PROPIO = "CABALLO_PROPIO"   // Own horse
}

const filterConfig = [
  {
    name: "propietario",
    label: "Propietario",
    type: "select" as const,
    options: [
      { label: "Sí", value: "true" },
      { label: "No", value: "false" },
    ],
  },
];

**Validations**:
- Private horses can only be used by their owners
- School horses can be assigned to any student
- If student has assigned horse, it appears preselected in class creation

if (
  filters.propietario !== "all" &&
  String(alumno.propietario) !== filters.propietario
) {
  return false;
}

const usoCaballos = useMemo(() => {
  const uso: Record<string, number> = {};
  clasesFiltradas.forEach((c: Clase) => {
    const cab = caballos.find((x: Caballo) => x.id === c.caballoId);
    if (cab) uso[cab.nombre] = (uso[cab.nombre] || 0) + 1;
  });
  return Object.entries(uso).map(([nombre, cantidad]) => {
    const cab = caballos.find((c: Caballo) => c.nombre === nombre);
    return {
      nombre,
      cantidad,
      tipo: cab?.tipo || "ESCUELA",
    };
  });
}, [clasesFiltradas, caballos]);