Stage 4: Calamares installer and Btrfs snapshots (0.2.0)

- Package Calamares 3.4.3 (Qt6, widgets UI) with xbps-src.
- das-installer: Calamares setup for Void/runit with Das OS branding and
  slides. It copies the clean live image (live-base), builds locales and the
  host-only initramfs, rewrites kernels without sparse tails (GRUB 2.12 cannot
  read Btrfs holes at the end of a file), then removes itself.
- das-snapshots: flat Btrfs layout (@, @home, @snapshots, @var_log,
  @var_cache_xbps), snapper with hourly snapshots via cronie, grub-btrfs menu,
  snapper-rollback, and a dracut module that boots read-only snapshots with
  a RAM overlay.
- das-settings 0.2.0: start LightDM with the system locale.
- Live image: GRUB, efibootmgr and the new packages; Das OS /etc/issue.
- Build: wipe stale destdirs before building packages.

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

srcpkgs/das-settings/files/lightdm/sv-conf

@@ -0,0 +1,8 @@
+# Sourced by /etc/sv/lightdm/run (installed by das-settings).
+# runit starts services with an empty environment, so pass the system language
+# from /etc/locale.conf to LightDM: the greeter and new sessions use it.
+if [ -r /etc/locale.conf ]; then
+	set -a
+	. /etc/locale.conf
+	set +a
+fi

srcpkgs/das-settings/template

@@ -4,7 +4,7 @@
 # Defaults go to /etc/xdg/das, which /etc/profile.d/das-xdg.sh puts in front of
 # /etc/xdg: stock Xfce files stay untouched and users' own changes still win.
 pkgname=das-settings
-version=0.1.0
+version=0.2.0
 revision=1
 create_wrksrc=yes
 depends="das-theme lightdm lightdm-gtk-greeter xfce4-notifyd xfce4-panel
@@ -14,7 +14,7 @@ short_desc="Das OS desktop defaults: Xfce panel, theme, fonts, login screen"
 maintainer="Das <anry.das@gmail.com>"
 license="MIT"
 homepage="https://git.das.org.ua/das/Das-OS"
-conf_files="/etc/profile.d/das-xdg.sh /etc/xdg/das/xfce4/xfconf/xfce-perchannel-xml/*.xml"
+conf_files="/etc/profile.d/das-xdg.sh /etc/sv/lightdm/conf /etc/xdg/das/xfce4/xfconf/xfce-perchannel-xml/*.xml"
 
 do_install() {
 	local xml
@@ -28,6 +28,7 @@ do_install() {
 	vinstall "${FILESDIR}/autostart/das-session-init.desktop" 644 etc/xdg/autostart
 
 	vinstall "${FILESDIR}/lightdm/50-das.conf" 644 usr/share/lightdm/lightdm.conf.d
+	vinstall "${FILESDIR}/lightdm/sv-conf" 644 etc/sv/lightdm conf
 	vinstall "${FILESDIR}/lightdm/50-das-greeter.conf" 644 \
 		usr/share/lightdm/lightdm-gtk-greeter.conf.d 50-das.conf
 	vlicense "${FILESDIR}/LICENSE"