PowerPoint's Design tab shows the current theme in four variants. The
Variants group had only the Colors and Fonts menus. theme_variants builds
four colour schemes from the theme's built-in colours (as designed, two
accent rotations, and a dark variant with light and dark swapped), so
switching between variants doesn't drift. design.variant applies one to
the master; design.variants reports them and which is applied. The
Design tab shows them as a gallery before Colors and Fonts.
Co-authored-by: Cursor <cursoragent@cursor.com>