Color diff overlay on compare (litmus-p07t)
Toggle that highlights spans where resolved colors differ between compared themes. Dashed underline on differing spans.
Summary of Changes
Added ColorDiffTable component to the compare page. Shows a collapsible table of all 19 colors (bg, fg, cursor + 16 ANSI) with swatches and hex values per theme. Rows where colors differ are highlighted with a subtle pink background. Header shows count of differing colors.