DynamicListPrompt<T> class

DynamicListPrompt – composable system for lists with dynamic items.

Handles patterns where items change based on state:

• Tree navigation (expand/collapse)
• File system navigation
• Any hierarchical or mutable list

Design principles:

• Composition over inheritance
• Separation of concerns (item generation is separate from navigation)
• DRY: Centralizes the dynamic list pattern

Usage:

final prompt = DynamicListPrompt<TreeEntry>(
  title: 'Explorer',
  buildItems: () => flattenTree(root, expandedNodes),
);

final result = prompt.run(
  onAction: (item, action) {
    if (action == ItemAction.expand) expandedNodes.add(item);
    if (action == ItemAction.collapse) expandedNodes.remove(item);
  },
);