Captures the current mode. The two generated theme files now hold the
dark theme because the mode is pinned; themes/light.conf still has the
light theme, so `theme light` and `theme auto` restore it.
kitty gives *-theme.auto.conf priority over everything -- includes and
even --override -- and has no option to stop following the OS. So the
only way to start in a chosen mode is to control what those files
contain. Make them generated:
themes/{light,dark,no-preference}.conf canonical, the real themes
theme-mode auto | light | dark
apply-theme-mode.sh writes the three .auto.conf
Under `auto` each appearance keeps its own theme, so kitty follows the
OS as before. Pinned, all three get the pinned theme, so kitty starts in
it whatever the OS says and a config reload no longer resets it.
`theme` now records the mode and reloads instead of calling set-colors,
which is why the setting survives restarts. A bare `theme` records
`auto` rather than pinning when the toggle lands on the macOS
appearance, so nothing is pinned unless it actually differs.
The kitten shim hashes the automatic theme files before running `kitten
themes` and copies whichever changed into themes/, so picking a new
light theme while pinned to dark is kept and applied on the next switch.
Covered by tests/test_theme_mode.sh.
conf.d/kitty_theme.fish is gone: theme-mode is now the source of truth,
so the universal-variable tracker it maintained is redundant.
