CUSTOM REACT: project the full property presentation (captions, read-only, colors, classes, images, sums)

[AlexKirkouski]

Part of #1666 (CUSTOM custom views — phase 4).

Description

A React custom container (custom = 'Component') today receives only property values. Extend the projected state with the same per-property/-cell presentation the platform already computes for native rendering:

• dynamic captions;
• read-only / disabled state;
• background and foreground colors;
• images;
• CSS classes (grid / value / caption);
• custom options, row selection and row colors;
• record count and column sums (footer).

The classic CUSTOM controller already exposes most of these through getters, so this is primarily about the React projection — and, where it makes sense, aligning the shape with the classic surface. It can land incrementally — one aspect at a time (e.g. read-only, then colors, then captions).

DESIGN myForm {
    dataBox { custom = 'MyGrid'; }   // MyGrid gets values today; it should also receive
}                                     // caption / read-only / colors / sums / etc.

// illustrative projected shape
function MyGrid({ data }) {
  return data.line.list.map(r =>
    <input key={r.value} value={r.qty} readOnly={/* r.qty readonly flag */}
           style={{ background: /* r.qty background */ }} />);
}

Reason

With values only, a React component can show raw data but cannot reflect read-only cells, conditional formatting (colors/classes), dynamic captions, totals/counts, or selection. Exposing the same presentation state the native grid uses closes the main gap between a React custom view and a natively rendered form, and brings it in line with the classic custom view.