c8bc629419
Add "Merge N rows" context-menu option that combines selected scan rows into one (min start, max end, max score), with full undo support. Ctrl+Z is now an application-wide shortcut so it works regardless of which widget has focus. Negatives undo now respects the exported-green row color instead of reverting to default. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>