Adding a quick access button for Light Switch (#44640)

Adds a button for Light Switch in the Quick Access section of the
Dashboard page. Clicking the button will toggle the theme.
<img width="1886" height="1173" alt="image"
src="https://github.com/user-attachments/assets/7923e1ac-aeea-47ab-b648-2400cb6f3ca4"
/>

src/settings-ui/Settings.UI.Controls/QuickAccess/QuickAccessLauncher.cs

@@ -112,6 +112,13 @@ namespace Microsoft.PowerToys.Settings.UI.Controls
                         eventHandle.Set();
                     }
 
+                    return true;
+                case ModuleType.LightSwitch:
+                    using (var eventHandle = new EventWaitHandle(false, EventResetMode.AutoReset, Constants.LightSwitchToggleEvent()))
+                    {
+                        eventHandle.Set();
+                    }
+
                     return true;
                 default:
                     return false;