Module header 

Header-level UI state: sort indicator, column reordering, and memoised index computation.

This module is intentionally decoupled from the renderer backends so that both egui and iced can share the same state types.

Structs

HeaderSortState

UI sort state tracked per column-header click.

TableIndex

Memoised sort-and-filter index to avoid recomputing expensive permutations on every frame.

Functions

handle_row_click

Handle a row-click event, delegating to the appropriate SelectionModel method.

move_column

Apply a column move: move the column at index from in order to position to. Other columns shift to fill the gap.