GroupConditionalLayout class final

A conditional layout for groups that adapts based on specified conditions.

Allows defining different layouts for groups based on conditions like:

• Screen size (single column vs multi-column)
• Theme mode (different spacing/padding)
• Content count (grid vs list)

Example:

final layout = GroupConditionalLayout(
  cases: [
    LayoutCaseItem(
      value: 'mobile',
      item: ListGroupLayout(),
    ),
    LayoutCaseItem(
      value: 'desktop',
      item: GridGroupLayout(columns: 3),
    ),
  ],
  defaultCase: 'desktop',
  condition: ScreenSize(),
);