feat: copy the vertical wallpaper to a phone

With PHONE_V set, every change of the vertical wallpaper is copied to
that path, a fixed name inside a folder Syncthing shares with a phone,
where a Termux loop applies it (script in the README). A copy, not a
symlink, because Syncthing does not follow links. It is built in
~/.cache/wallp and moved into place, so Syncthing never sees a partial
file.

PHONE_SIZE (WxH) crops it to the phone screen, centred, with magick, as
swaybg's fill does: Android otherwise scales a landscape image to the
screen height and shows its left edge. A stamp of source and size skips
an image already copied, so a --restore at login does not make the phone
reapply it. Unset PHONE_V does nothing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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