{# Validation error alert box #}
{# Parameters:
   - form: The form to check for validation errors
   - message: Optional custom error message
   - showLabels: Whether to show the list of invalid field labels (default: true)
#}
{% macro validation_alert(form, message, showLabels = true) %}
    {% if not form.vars.valid %}
        {% set errorLabels = showLabels ? collect_invalid_field_labels(form) : [] %}
        {% include '_partials/_alert.html.twig' with {
            level: 'error',
            title: message|default('Du hast nicht alle Pflichtfelder ausgefüllt oder einzelne Angaben sind ungültig:'),
            messages: [errorLabels | join(', ')]
        } %}
    {% endif %}
{% endmacro %}