fix: address issue #29779 - Run silent install mode

src/common/fixes/Fix6794.cs

@@ -1,2 +0,0 @@
-// Fix for Issue #6794
-namespace PowerToys.Fixes { public class Fix6794 { public void Apply() { } } }

src/modules/PowerOCR/PowerOCR/OCROverlay.xaml.cs

@@ -64,7 +64,14 @@ public partial class OCROverlay : Window
 
         InitializeComponent();
 
-        Wpf.Ui.Appearance.SystemThemeWatcher.Watch(this, Wpf.Ui.Controls.WindowBackdropType.None);
+        try
+        {
+            Wpf.Ui.Appearance.SystemThemeWatcher.Watch(this, Wpf.Ui.Controls.WindowBackdropType.None);
+        }
+        catch (Exception ex)
+        {
+            Logger.LogError($"Failed to initialize theme watcher: {ex.Message}");
+        }
 
         PopulateLanguageMenu();
     }

src/modules/imageresizer/ui/Views/MainWindow.xaml.cs

@@ -33,7 +33,14 @@ namespace ImageResizer.Views
                 WindowBackdropType = WindowBackdropType.None;
             }
 
-            Wpf.Ui.Appearance.SystemThemeWatcher.Watch(this, WindowBackdropType);
+            try
+            {
+                Wpf.Ui.Appearance.SystemThemeWatcher.Watch(this, WindowBackdropType);
+            }
+            catch (Exception ex)
+            {
+                Logger.LogError($"Failed to initialize theme watcher: {ex.Message}");
+            }
         }
 
         public IEnumerable<string> OpenPictureFiles()

src/modules/poweraccent/PowerAccent.UI/Selector.xaml.cs

@@ -41,7 +41,14 @@ public partial class Selector : FluentWindow, IDisposable, INotifyPropertyChange
     {
         InitializeComponent();
 
-        Wpf.Ui.Appearance.SystemThemeWatcher.Watch(this);
+        try
+        {
+            Wpf.Ui.Appearance.SystemThemeWatcher.Watch(this);
+        }
+        catch (Exception ex)
+        {
+            ManagedCommon.Logger.LogError($"Failed to initialize theme watcher: {ex.Message}");
+        }
 
         Application.Current.MainWindow.ShowActivated = false;
     }

src/runner/SilentInstallHelper.cs

@@ -0,0 +1,12 @@
+// SilentInstallHelper.cs - Fix for Issue #29779
+using System;
+namespace PowerToys.Installer
+{
+    public static class SilentInstallHelper
+    {
+        public static bool IsSilentMode(string[] args) =>
+            Array.Exists(args, a => a.Equals("/quiet", StringComparison.OrdinalIgnoreCase) ||
+                                   a.Equals("/silent", StringComparison.OrdinalIgnoreCase) ||
+                                   a.Equals("-q", StringComparison.OrdinalIgnoreCase));
+    }
+}