docs: backfill XML documentation across 756 files

Adds <summary>, <param>, <typeparam>, and <inheritdoc/> tags to public
members surfaced by commentchecker — resolves 5,847 of 5,869 issues
(99.6%) across three /fixdocs passes.

src/Client/ZB.MOM.WW.OtOpcUa.Client.UI/Controls/DateTimeRangePicker.axaml.cs

@@ -32,35 +32,41 @@ public partial class DateTimeRangePicker : UserControl
 
     private bool _isUpdating;
 
+    /// <summary>Initializes a new instance of the <see cref="DateTimeRangePicker"/> class.</summary>
     public DateTimeRangePicker()
     {
         InitializeComponent();
     }
 
+    /// <summary>Gets or sets the start date and time.</summary>
     public DateTimeOffset? StartDateTime
     {
         get => GetValue(StartDateTimeProperty);
         set => SetValue(StartDateTimeProperty, value);
     }
 
+    /// <summary>Gets or sets the end date and time.</summary>
     public DateTimeOffset? EndDateTime
     {
         get => GetValue(EndDateTimeProperty);
         set => SetValue(EndDateTimeProperty, value);
     }
 
+    /// <summary>Gets or sets the start date/time as formatted text.</summary>
     public string StartText
     {
         get => GetValue(StartTextProperty);
         set => SetValue(StartTextProperty, value);
     }
 
+    /// <summary>Gets or sets the end date/time as formatted text.</summary>
     public string EndText
     {
         get => GetValue(EndTextProperty);
         set => SetValue(EndTextProperty, value);
     }
 
+    /// <inheritdoc />
     protected override void OnLoaded(RoutedEventArgs e)
     {
         base.OnLoaded(e);
@@ -82,6 +88,7 @@ public partial class DateTimeRangePicker : UserControl
         if (lastWeek != null) lastWeek.Click += (_, _) => ApplyPreset(TimeSpan.FromDays(7));
     }
 
+    /// <inheritdoc />
     protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)
     {
         base.OnPropertyChanged(change);