The cell-based table couldn't be edited reliably (no click-to-edit, no
Tab between columns). Rewritten as a view-based NSTableView where each
cell is an editable NSTextField committed via controlTextDidEndEditing
(Enter/Tab/focus-loss). Tab now moves from "Felismert" to "Helyette".
Rows where both columns are blank are pruned on add and on window close,
so empty rows are never persisted.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
913ce5ca1a