init_colors() now survives a terminal rejecting every init_pair() call
(some serial-console terminfo entries claim start_color()/COLORS support
but can't actually set custom pairs), but that exposed a follow-on bug:
the list cursor and the cert-form Continue/Cancel buttons indicated
selection purely via the COLOR_SELECTED color pair, so once that pair
silently no-ops the current row/button becomes indistinguishable from
an unselected one. Add curses.A_REVERSE alongside the color pair for
the selected state — a plain video attribute that doesn't depend on
custom-pair support, so the cursor stays visible either way.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
