Shared sort controls component for List and Grid renderers.
Renders a button group for sorting since these layouts don't have table headers.
Summary
Functions
Returns true if any columns are sortable.
Renders sort controls as a button group.
Required assigns
columns- List of column definitionssort_by- Current sort state (list of {field, direction} tuples)sort_label- Label for the sort controls (e.g., "Sort by:")theme- Theme configuration mapmyself- LiveComponent reference for event targeting