{#
  Reusable form field grid — renders a list of Field/Section/Fieldset items
  as a responsive form grid without any surrounding <form> or buttons.

  Required context variables:
    _fields    — list of Field / Section / Fieldset instances
    _form_cols — int (1–4): top-level grid column count
    record     — dict or ORM object to pre-fill values (or None)
    errors     — dict of {field_key: error_message} (or None)

  Optional context variables (inherited from layout globals if already set):
    _cols_map, _span_map — will be set here if not already present

  Usage in a custom page template:
    {% set _fields    = my_fields %}
    {% set _form_cols = 2 %}
    {% set record     = existing_record %}
    {% set errors     = form_errors %}
    {% include "partials/form_grid.html" %}
#}
{%- set _cols_map = {1: "grid-cols-1", 2: "grid-cols-1 sm:grid-cols-2", 3: "grid-cols-1 sm:grid-cols-2 lg:grid-cols-3", 4: "grid-cols-1 sm:grid-cols-2 lg:grid-cols-4"} %}
{%- set _span_map = {"full": "col-span-full", 2: "col-span-2", 3: "col-span-3", 4: "col-span-4"} %}
{%- set _top_cols = _cols_map[_form_cols] if _form_cols in _cols_map else "grid-cols-1" %}
{% from "partials/macros/form_item.html" import render_item with context %}
{% if _fields %}
<div class="grid {{ _top_cols }} gap-5">
  {% for item in _fields %}{{ render_item(item) }}{% endfor %}
</div>
{% endif %}