Convert sensor pane scaffold and TreeView to MainWindow.xaml (Phase 5b step 4)

Declare the sensor pane (SensorPane), header host (SensorHeaderHost), and TreeView (SensorTree, with its ContentPresenter DataTemplate and SelectionChanged handler) in XAML. The measurer-managed header grid and the per-row CreateSensorRow content remain imperative since they involve dynamic column-width pushing and per-item context flyouts/double-tap handlers; this is the hybrid fallback called out in the Phase 5b plan.

Drop _sensorTree/_sensorPane fields; replace BuildSensorPane with a small PopulateSensorHeader and delete the old XamlReader-loaded DataTemplate.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

LibreHardwareMonitor.Windows.WinUI/MainWindow.cs

@@ -36,8 +36,6 @@ public sealed partial class MainWindow : Window
     private readonly DispatcherQueueTimer _timer;
     private readonly PlotView _plotView;
     private readonly Grid _plotPane;
-    private readonly TreeView _sensorTree;
-    private readonly Grid _sensorPane;
     private readonly WinUiStartupTrace? _startupTrace;
     private readonly TrayIconService _trayIconService;
     private readonly DialogService _dialogService;
@@ -96,17 +94,7 @@ public sealed partial class MainWindow : Window
         Bind(ContentGrid, UIElement.IsHitTestVisibleProperty, ViewModel, nameof(ViewModel.IsHardwareInteractionEnabled));
 
         MeasureStartup("MainWindow.PopulateMenuSubmenus", PopulateMenuSubmenus);
-
-        TreeView? builtTree = null;
-        Grid sensorPane = MeasureStartup("MainWindow.BuildSensorPane", () =>
-        {
-            Grid pane = BuildSensorPane(out TreeView tree);
-            builtTree = tree;
-            return pane;
-        });
-        _sensorPane = sensorPane;
-        _sensorTree = builtTree!;
-        ContentGrid.Children.Add(sensorPane);
+        MeasureStartup("MainWindow.PopulateSensorHeader", PopulateSensorHeader);
 
         PlotView? builtPlot = null;
         Grid plotPane = MeasureStartup("MainWindow.BuildPlotPane", () =>
@@ -226,7 +214,7 @@ public sealed partial class MainWindow : Window
 
     private string GetRootSizeDetail()
     {
-        return FormattableString.Invariant($"root={RootGrid.ActualWidth:F0}x{RootGrid.ActualHeight:F0}, rows={_columnMeasurer.RowCount}, rootNodes={_sensorTree.RootNodes.Count}");
+        return FormattableString.Invariant($"root={RootGrid.ActualWidth:F0}x{RootGrid.ActualHeight:F0}, rows={_columnMeasurer.RowCount}, rootNodes={SensorTree.RootNodes.Count}");
     }
 
     private void RootGrid_Loaded(object sender, RoutedEventArgs e)
@@ -371,17 +359,8 @@ public sealed partial class MainWindow : Window
     private async void OnWebServerAuthentication(object sender, RoutedEventArgs e) => await _dialogService.ShowWebServerAuthenticationAsync();
     private async void OnAbout(object sender, RoutedEventArgs e) => await _dialogService.ShowAboutAsync();
 
-    private Grid BuildSensorPane(out TreeView tree)
+    private void PopulateSensorHeader()
     {
-        Grid pane = new()
-        {
-            RowDefinitions =
-            {
-                new RowDefinition { Height = GridLength.Auto },
-                new RowDefinition { Height = new GridLength(1, GridUnitType.Star) }
-            }
-        };
-
         Grid header = _columnMeasurer.CreateHeaderGrid();
         header.Padding = new Thickness(8, 5, 8, 5);
         header.Background = (Brush)Application.Current.Resources["SystemControlBackgroundChromeMediumLowBrush"];
@@ -389,20 +368,7 @@ public sealed partial class MainWindow : Window
         header.Children.Add(CreateHeaderText("Value", 1, ViewModel.ValueColumnVisibility, nameof(ViewModel.ValueColumnVisibility)));
         header.Children.Add(CreateHeaderText("Min", 2, ViewModel.MinColumnVisibility, nameof(ViewModel.MinColumnVisibility)));
         header.Children.Add(CreateHeaderText("Max", 3, ViewModel.MaxColumnVisibility, nameof(ViewModel.MaxColumnVisibility)));
-        pane.Children.Add(header);
-
-        Grid treeHost = new();
-        Grid.SetRow(treeHost, 1);
-        tree = new()
-        {
-            ItemTemplate = CreateTreeViewNodeContentTemplate(),
-            SelectionMode = TreeViewSelectionMode.Single
-        };
-        tree.SelectionChanged += SensorTree_SelectionChanged;
-        treeHost.Children.Add(tree);
-        pane.Children.Add(treeHost);
-
-        return pane;
+        SensorHeaderHost.Children.Add(header);
     }
 
     private Grid BuildPlotPane(out PlotView plotView)
@@ -636,16 +602,13 @@ public sealed partial class MainWindow : Window
 
     private void RebuildSensorTreeCore()
     {
-        if (_sensorTree == null)
-            return;
-
         _columnMeasurer.ResetRows();
-        _sensorTree.RootNodes.Clear();
+        SensorTree.RootNodes.Clear();
         foreach (SensorTreeItemViewModel item in ViewModel.RootItems)
         {
             TreeViewNode? node = CreateTreeNode(item);
             if (node != null)
-                _sensorTree.RootNodes.Add(node);
+                SensorTree.RootNodes.Add(node);
         }
 
         UpdateSensorColumnWidths();
@@ -667,17 +630,6 @@ public sealed partial class MainWindow : Window
             CompleteStartupTraceIfReady();
     }
 
-    private static DataTemplate CreateTreeViewNodeContentTemplate()
-    {
-        const string xaml = """
-            <DataTemplate xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
-                <ContentPresenter Content="{Binding Content}" />
-            </DataTemplate>
-            """;
-
-        return (DataTemplate)XamlReader.Load(xaml);
-    }
-
     private TreeViewNode? CreateTreeNode(SensorTreeItemViewModel item)
     {
         if (item.RowVisibility == Visibility.Collapsed)
@@ -881,8 +833,8 @@ public sealed partial class MainWindow : Window
         Grid.SetColumn(_plotPane, ViewModel.PlotGridColumn);
         Grid.SetRowSpan(_plotPane, ViewModel.PlotGridRowSpan);
         Grid.SetColumnSpan(_plotPane, ViewModel.PlotGridColumnSpan);
-        Grid.SetRowSpan(_sensorPane, ViewModel.SensorGridRowSpan);
-        Grid.SetColumnSpan(_sensorPane, ViewModel.SensorGridColumnSpan);
+        Grid.SetRowSpan(SensorPane, ViewModel.SensorGridRowSpan);
+        Grid.SetColumnSpan(SensorPane, ViewModel.SensorGridColumnSpan);
         UpdatePlotWindowVisibility();
         DrawPlot();
     }

LibreHardwareMonitor.Windows.WinUI/MainWindow.xaml

@@ -87,6 +87,24 @@
                 <RowDefinition Height="*" />
                 <RowDefinition Height="220" />
             </Grid.RowDefinitions>
+            <Grid x:Name="SensorPane" Grid.Column="0" Grid.Row="0">
+                <Grid.RowDefinitions>
+                    <RowDefinition Height="Auto" />
+                    <RowDefinition Height="*" />
+                </Grid.RowDefinitions>
+                <Grid x:Name="SensorHeaderHost" Grid.Row="0" />
+                <Grid Grid.Row="1">
+                    <TreeView x:Name="SensorTree"
+                              SelectionMode="Single"
+                              SelectionChanged="SensorTree_SelectionChanged">
+                        <TreeView.ItemTemplate>
+                            <DataTemplate>
+                                <ContentPresenter Content="{Binding Content}" />
+                            </DataTemplate>
+                        </TreeView.ItemTemplate>
+                    </TreeView>
+                </Grid>
+            </Grid>
         </Grid>
         <TextBlock x:Name="StatusText"
                    Grid.Row="2"