Let the headset sleep with the helper idle; keep the container out of our units

With the pointer released, the helper still listed overlays by running
vrcmd every second, a new SteamVR client each time, which kept SteamVR
from going to standby. The list now pauses while the pointer is off.

Starting the dev container from one of our services made that service own
it, so stopping the service stopped the container and the desktop's
compositor with it. scripts/container-up.sh starts the container in a
systemd scope of its own before every distrobox enter.

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

input-settings/ft-input-settings

@@ -10,6 +10,7 @@ case $wl in /*) ;; *) wl="${XDG_RUNTIME_DIR:-/run/user/$(id -u)}/$wl" ;; esac
 session_bus=${DBUS_SESSION_BUS_ADDRESS:-}
 export XDG_RUNTIME_DIR=/run/user/$(id -u)
 export DBUS_SESSION_BUS_ADDRESS=unix:path=$XDG_RUNTIME_DIR/bus
+"$here/../scripts/container-up.sh"
 exec "$HOME/.local/bin/distrobox" enter dev -- env WAYLAND_DISPLAY="$wl" DISPLAY="${DISPLAY:-}" \
   XAUTHORITY="${XAUTHORITY:-}" DBUS_SESSION_BUS_ADDRESS="$session_bus" \
   QT_QPA_PLATFORM="wayland;xcb" \