`kitten themes` treats every .conf in <config-dir>/themes as a user
theme, which the mode system's canonical store was sitting in -- so the
picker was offering three bogus entries named light, dark and
no-preference, and had been since that store was introduced.
Move the store to ./theme-modes so ./themes means only what the kitten
means by it, and repoint apply-theme-mode.sh, the kitten shim, the
run_after hook and the test at the new path.
GrokNight and GrokDay move into ./themes with the ## name/author/
license/upstream/blurb header the kitten reads, so they now show up in
`kitten themes` and `--dump-theme` resolves them.
theme-modes/dark.conf carries the #202020 theme that was already on
disk: the file had to be re-added at its new path, so that drift comes
along with it.
theme-mode is a per-machine preference, and the three *-theme.auto.conf
files are generated from it plus themes/, so tracking any of them made
every machine flag the others' choice. Drop all four from the source
state and ignore them.
That leaves a freshly applied machine with no theme files for kitty to
read, so add run_after_kitty-theme-mode.sh to regenerate them from the
canonical themes. It defaults to `auto`, so a new machine follows its OS
until told otherwise, and it exits quietly where this kitty config isn't
applied rather than failing the run.
Since that script now runs on every apply, including on Linux, make the
permission lookup in both shell scripts fall back from BSD `stat -f` to
GNU `stat -c` and then to 600.
