Editable ListBox cells do not enter or commit editing reliably

Editable ListBox columns do not currently provide the expected cell editing behaviour. When a ListBox column is set to ListBoxColumnType.Editable, pressing Enter on a focused cell can move focus to another row instead of entering or committing cell editing, which makes editable cells feel broken or difficult to use.

The expected behaviour is that editable text cells should support predictable editing: double-click starts editing, Enter/F2 starts editing when the cell is focused, Enter commits while editing, Escape cancels, and successful commits fire CellEdited(row, column).