This PR adds support for custom summary rendering in composed DataForm fields through an optional summary property. Previously, composed fields would always display the first child field's value as the summary. Now, developers can specify which field's render method should be used for the summary display.

Problem

When using composed fields (fields with children), the panel layout would always use the first simple child field to display the summary value. This limitation prevented meaningful summaries for complex composed fields where a custom rendering logic would be more appropriate.

For example, a "Discussion" field containing both comment status and ping status would only show the comment status, missing the complete picture.

Solution

Type Changes

• Extended CombinedFormField type with optional summary?: string property
• The summary property references a field ID whose render method will be used for display

Implementation

• Modified panel field resolution logic in dataforms-layouts/panel/index.tsx
• When a composed field has a summary property, the system looks for that field definition instead of defaulting to the first child
• Maintains backward compatibility - existing composed fields continue to work unchanged

Usage Example

// Field definition with custom render
{
  id: 'discussion',
  label: 'Discussion',
  type: 'text',
  render: ({ item }) => {
    const commentLabel = item.comment_status === 'open' 
      ? 'Allow comments' 
      : 'Comments closed';
    const pingLabel = item.ping_status 
      ? 'Pings enabled' 
      : 'Pings disabled';
    return <span>{commentLabel}, {pingLabel}</span>;
  },
}

// Composed field using custom summary
{
  id: 'discussion',
  label: 'Discussion', 
  children: ['comment_status', 'ping_status'],
  summary: 'discussion', // References the field above
}

Benefits

• Enhanced UX: Composed fields can now show meaningful, context-aware summaries
• Flexible: Any field's render method can be used for summary display
• Backward Compatible: No breaking changes to existing implementations

Testing

Go to http://localhost:50240/?path=/story/dataviews-dataform--layout-panel and verify the Discussion field works as expected.