Validate all accessibility hardening together

src/ui/Features/Translate/TranslateSettingsWindow.cs

@@ -81,6 +81,7 @@ public TranslateSettingsWindow(TranslateSettingsViewModel vm)
             TextWrapping = Avalonia.Media.TextWrapping.Wrap,
         }.BindIsVisible(vm, nameof(vm.PromptIsVisible))
             .BindText(vm, nameof(vm.PromptText));
+        promptTextBox.WithLabeledBy(labelPrompt);
 
         var buttonOk = UiUtil.MakeButtonOk(vm.OkCommand);
         var buttonCancel = UiUtil.MakeButtonCancel(vm.CancelCommand);

src/ui/Features/Video/TextToSpeech/VoiceManager/VoiceManagerWindow.cs

@@ -216,7 +216,7 @@
 
         var searchBox = new TextBox
         {
             Watermark = Se.Language.Video.TextToSpeech.SearchVoices,
             MinWidth = 180,
             VerticalAlignment = VerticalAlignment.Center,
             [!TextBox.TextProperty] = new Binding(nameof(vm.FilterText)) { Mode = BindingMode.TwoWay },
@@ -504,6 +504,7 @@
             HorizontalAlignment = HorizontalAlignment.Stretch,
             [!TextBox.TextProperty] = new Binding(nameof(vm.Transcript)) { Mode = BindingMode.TwoWay },
         };
+        transcriptBox.WithLabeledBy(transcriptHeader);
 
         var transcriptPanel = new StackPanel
         {

tests/UI/Logic/AccessibleNamesTests.cs

@@ -21,7 +21,9 @@
 /// by the window or derived from its visible label by <see cref="AccessibleLabels"/>
 /// (#12087: "I hear a value followed by combo box, but no label telling me which setting
 /// I am changing"). This opens every tool window that takes a single DI-resolvable view
-/// model and lists the inputs that still have no name.
+/// model and lists the inputs that still have no name. Hidden inputs are included because
+/// AccessibleLabels.Apply runs once when the window loads; controls that become visible later
+/// do not get a second inference pass.
 /// </summary>
 public class AccessibleNamesTests
 {
@@ -43,6 +45,7 @@
             .ToList();
 
         var unnamed = new StringBuilder();
+        var openFailures = new StringBuilder();
         var opened = 0;
         var skipped = new List<string>();
         foreach (var type in windowTypes)
@@ -71,7 +74,8 @@
             }
             catch (Exception e)
             {
-                skipped.Add($"{type.Name} ({(e as TargetInvocationException)?.InnerException?.GetType().Name ?? e.GetType().Name})");
+                var cause = (e as TargetInvocationException)?.InnerException ?? e;
+                openFailures.AppendLine($"{type.Name}: {cause.GetType().Name}: {cause.Message}");
                 continue;
             }
 
@@ -80,7 +84,7 @@
             {
                 foreach (var control in window.GetLogicalDescendants().OfType<Control>())
                 {
-                    if (!AccessibleLabels.IsInput(control) || control.TemplatedParent != null || !control.IsEffectivelyVisible)
+                    if (!AccessibleLabels.IsInput(control) || control.TemplatedParent != null)
                     {
                         continue;
                     }
@@ -99,27 +103,20 @@
             }
         }
 
+        Assert.True(openFailures.Length == 0, $"Windows that failed to open:\n{openFailures}");
         Assert.True(opened > 50, $"Only {opened} windows opened; skipped: {string.Join(", ", skipped)}");
         Assert.True(unnamed.Length == 0, $"Inputs without an accessible name ({opened} windows opened, {skipped.Count} skipped):\n{unnamed}");
     }
 
     /// <summary>
-    /// Runs pending dispatcher jobs, ignoring what they throw. Some view models probe media
-    /// on a background thread from Loaded and post a message box back (Video OCR: "unable
-    /// to read video"); when that post lands after the window is closed, showing the box
-    /// throws "Cannot show a window with a closed owner" - a timing artifact of opening
-    /// windows without files, not an accessibility finding.
+    /// Runs pending dispatcher jobs. Unexpected dispatcher failures must fail the test;
+    /// the Video OCR closed-owner race that previously required suppression is now fixed
+    /// at the source by checking whether its window is already closing before showing the
+    /// message box (upstream 6840e797).
     /// </summary>
     private static void DrainJobs()
     {
-        try
-        {
-            Dispatcher.UIThread.RunJobs();
-        }
-        catch (Exception)
-        {
-            // Ignored - see summary.
-        }
+        Dispatcher.UIThread.RunJobs();
     }
 
     private static string Describe(Control control)
@@ -130,9 +127,9 @@
             parts.Add($"name={control.Name}");
         }
 
         if (control is TextBox textBox && !string.IsNullOrEmpty(textBox.Watermark))
         {
             parts.Add($"watermark={textBox.Watermark}");
         }
 
         var parent = control.Parent;