Stage 5: das-update and das-welcome (0.3.0)

das-tools (Go, GTK 3 via gotk3):
- das-update: update window, tray icon when updates are available,
  --cli mode; xbps-install -Su between a snapper pre/post snapshot pair,
  privileged part through pkexec, rollback and reboot hints
- das-welcome: first-login window with install (live), language,
  home folder renaming, updates, settings and help

das-settings 0.3.0: create home folders with translated names.
xdg-user-dirs 0.20 only looks for translations in the first
XDG_DATA_DIRS entry with a locale directory (/usr/local/share/locale).

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

srcpkgs/das-tools/files/data/das-welcome.desktop

@@ -0,0 +1,10 @@
+[Desktop Entry]
+Type=Application
+Name=Welcome to Das OS
+Name[uk]=Ласкаво просимо до Das OS
+Comment=Language, home folders, updates and help
+Comment[uk]=Мова, теки, оновлення та довідка
+Exec=das-welcome
+Icon=das-logo
+Terminal=false
+Categories=System;