Accessibility: a high-contrast theme, and every state readable without color

theme = high-contrast draws High Contrast Dark or Light by the
terminal's background (each also nameable), with every role held to
WCAG AAA: 7:1 for all text, hints included, 4.5:1 for lines and
unavailable items.

The audit: the pointer, the selection and their headers, search matches,
traced cells and the highlighted menu item are drawn in reverse video
with their colors stored swapped, so they look the same in color and
still stand out without it; spilled values are italic. The other states
already had text, a glyph or an underline. theme.Monochrome draws every
role in one gray, and monochrome_test.go checks each state's cue in the
cell's text or attributes. Drawable undoes the reverse video where
lipgloss would draw underlined spaces without it.

Golden screens for the high-contrast theme, dark, light and a menu.

commit

126ed86872d1ac6f0a7997250a6347a589e8d8e9

parent

f0d0fafc45d0c87e1a7f2b205226b612df59a653

author

Dami <dami.etoile@gmail.com>