feat: expand cockpit integrations and support workflows

Add Phoenix remote desktop, action connector, documentation engine, and gamification support. Refactor support-case processing and search/action UI, and update installer assets and dependencies.

FasdDesktopUi/Basics/Converter/LanguageCultureConverter.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Globalization;
+using System.Windows.Data;
+using System.Windows.Markup;
+
+namespace FasdDesktopUi.Basics.Converter
+{
+    [ValueConversion(typeof(string), typeof(XmlLanguage))]
+    internal class LanguageCultureConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is string tag))
+                return Binding.DoNothing;
+
+            return XmlLanguage.GetLanguage(tag);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (!(value is XmlLanguage lang))
+                return Binding.DoNothing;
+
+            return lang.IetfLanguageTag;
+        }
+    }
+}