feat: Live session: power-off fix built for the ISO's kernels, Vapor look and layout at the live login

archiso/airootfs/etc/xdg/autostart/steamify-live-theme.desktop

@@ -0,0 +1,7 @@
+[Desktop Entry]
+Type=Application
+Name=Steamify live theme
+Exec=/usr/local/bin/steamify-live-theme
+OnlyShowIn=KDE;
+X-KDE-autostart-phase=2
+NoDisplay=true

archiso/airootfs/usr/local/bin/steamify-live-theme

@@ -0,0 +1,7 @@
+#!/bin/bash
+# The live session in the Vapor look, with its SteamOS desktop layout.
+# CachyOS's own layout comes from /etc/skel, which the live user gets before
+# this runs; lookandfeeltool needs plasmashell up to replace it.
+for _ in $(seq 30); do pgrep -u "$USER" -x plasmashell >/dev/null && break; sleep 1; done
+sleep 2
+lookandfeeltool -a com.valve.vapor.desktop --resetLayout

archiso/packages_desktop.x86_64

@@ -90,6 +90,7 @@ linux-cachyos
 linux-cachyos-nvidia-open
 linux-cachyos-zfs
 linux-firmware
+cachyos-vapor
 linux-firmware-marvell
 lsb-release
 lsof

archiso/profiledef.sh

@@ -28,6 +28,7 @@ file_permissions=(
   ["/usr/local/bin/choose-mirror"]="0:0:755"
   ["/usr/local/bin/dmcheck"]="0:0:755"
   ["/usr/local/bin/steamify-install"]="0:0:755"
+  ["/usr/local/bin/steamify-live-theme"]="0:0:755"
   ["/usr/local/bin/calamares-online.sh"]="0:0:755"
   ["/usr/local/bin/remove-nvidia"]="0:0:755"
   ["/usr/local/bin/removeun"]="0:0:755"