Introduce a flexible InfoPanel architecture for grid components, allowing per-grid customization via a new InfoPanelType parameter. Add MgInfoPanelTemplateBase for code-based InfoPanel templates with overridable header, content, and footer sections. Support custom templates in MgGridInfoPanel via new RenderFragment parameters. Add MgGridDataColumn for InfoPanel-specific column settings. Demonstrate usage with a custom InfoPanel for ShippingDocument grid. Maintains backward compatibility with default InfoPanel behavior.
