test(ui): inspect themed property hierarchy

HANDOFF.md

@@ -6,19 +6,21 @@
 - `ChannelStatsServiceTests` uses dates relative to UTC so its 90-day upload assertion does not
   expire with the calendar; fix committed as `3985a41`.
 - `ScoreboardPropertiesTests` now checks for the themed `PropertyPillCheck` style instead of stale
-  `YtCheckBox` markup; focused test passes. This task is ready to commit.
-- Clean app build is 0 warnings. Full suite: 11 failed / 511 passed of 522; remaining failures are
+  `YtCheckBox` markup; committed as `221b816`.
+- `PropertiesHierarchyTests` now checks shared styles and scopes the duplicate shape bindings to
+  the Shape block; focused test passes. This task is ready to commit.
+- Clean app build is 0 warnings. Full suite: 10 failed / 512 passed of 522; remaining failures are
   being handled one task and one local commit at a time.
 
 ## Next action
 
-Commit the scoreboard-properties assertion update, then take the next remaining failure. Do not
+Commit the properties-hierarchy assertion update, then take the next remaining failure. Do not
 push absent a milestone/checkpoint request.
 
 ## Landmines
 
 - Build/test with Windows `dotnet.exe`; the full suite can hang in WASAPI teardown.
-- `verify.sh` cannot pass until the remaining 11 suite failures are resolved; scope checks are run
+- `verify.sh` cannot pass until the remaining 10 suite failures are resolved; scope checks are run
   separately when that gate exits early.
 - Any integration test constructing `MainWindow` must set `LayoutPathOverride` to a temporary DB
   and clear it in `finally`.

ytLive.Tests/PropertiesHierarchyTests.cs

@@ -47,20 +47,27 @@ public class PropertiesHierarchyTests
 
         // ── The panel: a Shape title owns the options, the hint is indented ───
         var doc = XDocument.Load(SourceAssert.RepoPath("Controls", "LeftPanel.xaml"));
+        XNamespace xaml = "http://schemas.microsoft.com/winfx/2006/xaml";
+        var theme = XDocument.Load(SourceAssert.RepoPath("Themes", "Controls.xaml"));
+        var propertyHeaderStyle = theme.Descendants().Single(e => e.Name.LocalName == "Style"
+            && (string?)e.Attribute(xaml + "Key") == "PropertyHeader");
+        var fontWeight = propertyHeaderStyle.Elements().Single(e => e.Name.LocalName == "Setter"
+            && (string?)e.Attribute("Property") == "FontWeight");
+        Assert.Equal("SemiBold", (string?)fontWeight.Attribute("Value"));
 
         var shapeTitle = doc.Descendants().Single(e => e.Name.LocalName == "TextBlock"
             && (string?)e.Attribute("Text") == "Shape");
-        Assert.Equal("SemiBold", (string?)shapeTitle.Attribute("FontWeight"));
+        Assert.Equal("{StaticResource PropertyHeader}", (string?)shapeTitle.Attribute("Style"));
 
-        var rectOption = OptionBoundTo(doc, "IsRectShape");
-        var circleOption = OptionBoundTo(doc, "IsRoundShape");
+        var shapeBlock = shapeTitle.Parent!;
+        var rectOption = OptionBoundTo(shapeBlock, "IsRectShape");
+        var circleOption = OptionBoundTo(shapeBlock, "IsRoundShape");
         Assert.Contains("TwoWay", (string?)rectOption.Attribute("IsChecked") ?? "");
 
         // The CIRCLE is the option that is not offered in the vertical Chat layout.
         Assert.Contains("CanToggleClipShape", (string?)circleOption.Attribute("Visibility") ?? "");
 
         // Both options live under the Shape title.
-        var shapeBlock = shapeTitle.Parent!;
         Assert.Contains(rectOption, shapeBlock.Descendants());
         Assert.Contains(circleOption, shapeBlock.Descendants());
 
@@ -76,8 +83,8 @@ public class PropertiesHierarchyTests
         // ── Every titled block owns its content one indent deeper ────────────
         var geometryTitle = doc.Descendants()
             .Where(e => e.Name.LocalName == "TextBlock" && (string?)e.Attribute("Text") == "Geometry")
-            .Single(e => ((string?)e.Parent?.Attribute("Visibility") ?? "").Contains("IsWebcamSelected"));
-        Assert.Equal("SemiBold", (string?)geometryTitle.Attribute("FontWeight"));
+            .Single(e => ((string?)e.Parent?.Attribute("Visibility") ?? "").Contains("SelectedElement.IsDraggable"));
+        Assert.Equal("{StaticResource PropertyHeader}", (string?)geometryTitle.Attribute("Style"));
         foreach (var row in geometryTitle.Parent!.Elements().Where(e => e.Name.LocalName == "DockPanel"))
             Assert.Equal(10, LeftIndent(row));
 
@@ -89,7 +96,7 @@ public class PropertiesHierarchyTests
         {
             var label = webcamPanel.Descendants().Single(e => e.Name.LocalName == "TextBlock"
                 && (string?)e.Attribute("Text") == title);
-            Assert.Equal("SemiBold", (string?)label.Attribute("FontWeight"));
+            Assert.Equal("{StaticResource PropertyHeader}", (string?)label.Attribute("Style"));
             Assert.Equal(10, LeftIndent(RowAfter(label)));
         }
 
@@ -101,8 +108,8 @@ public class PropertiesHierarchyTests
     }
 
     /// <summary>The shape option bound to the given model property.</summary>
-    private static XElement OptionBoundTo(XDocument doc, string property) =>
-        doc.Descendants().Single(e => e.Name.LocalName == "ToggleButton"
+    private static XElement OptionBoundTo(XElement scope, string property) =>
+        scope.Descendants().Single(e => e.Name.LocalName == "ToggleButton"
             && ((string?)e.Attribute("IsChecked") ?? "").Contains(property));
 
     /// <summary>The row (DockPanel) that holds the given label.</summary>