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/ua.org.das.update.policy

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE policyconfig PUBLIC "-//freedesktop//DTD PolicyKit Policy Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/PolicyKit/1/policyconfig.dtd">
+<policyconfig>
+  <vendor>Das OS</vendor>
+  <vendor_url>https://git.das.org.ua/das/Das-OS</vendor_url>
+  <action id="ua.org.das.update">
+    <description>Update the system</description>
+    <description xml:lang="uk">Оновлення системи</description>
+    <message>Authentication is required to install system updates</message>
+    <message xml:lang="uk">Для встановлення оновлень потрібна автентифікація</message>
+    <icon_name>software-update-available</icon_name>
+    <defaults>
+      <allow_any>auth_admin</allow_any>
+      <allow_inactive>auth_admin</allow_inactive>
+      <allow_active>auth_admin_keep</allow_active>
+    </defaults>
+    <annotate key="org.freedesktop.policykit.exec.path">/usr/bin/das-update</annotate>
+  </action>
+</policyconfig>