Duplicate shortcut no longer works because Delete Line shares Cmd+D

The Duplicate command (Cmd+D on macOS, Ctrl+D on Windows/Linux) stopped working for duplicating windows and controls in the visual designer. The editor command Delete Line, added in the previous release, was also bound to the same shortcut. On macOS the native Edit menu intercepts Cmd+D before it reaches the designer, so pressing Cmd+D with a window or control selected did nothing.

Delete Line now uses Cmd+Shift+K on macOS and Ctrl+Shift+K on Windows/Linux, leaving Cmd+D/Ctrl+D exclusively for Duplicate.