[CmdPal] Settings UI polishing (#38094)

<!-- Enter a brief description/summary of your PR here. What does it fix/what does it change/how was it tested (even manually, if necessary)? -->
## Summary of the Pull Request

Settings window UI polishing:
- Make the navigation view toggle button move in the title bar when navigation view mode is compact or minimal
- Center settings card in the window
- Properly set windows icon in order to make it visible in task manager and task view

_main branch_
![image](https://github.com/user-attachments/assets/792f0779-016a-4056-81b0-04244d903909)

![image](https://github.com/user-attachments/assets/81ac2761-2a9c-4fe7-a122-2f69f900e656)

_PR_
![image](https://github.com/user-attachments/assets/029b95a0-9629-4732-9f0c-bf586954e887)

![image](https://github.com/user-attachments/assets/81bb2beb-9a07-42cf-8594-16ba5a9cda1b)

<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist

- [ ] **Closes:**: https://github.com/zadjii-msft/PowerToys/issues/581

---------

Co-authored-by: Niels Laute <niels.laute@live.nl>

src/modules/cmdpal/Microsoft.CmdPal.UI/Helpers/WindowExtensions.cs

@@ -0,0 +1,20 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.UI;
+using Microsoft.UI.Windowing;
+using Microsoft.UI.Xaml;
+
+namespace Microsoft.CmdPal.UI.Helpers;
+
+public static class WindowExtensions
+{
+    public static void SetIcon(this Window window)
+    {
+        var hWnd = WinRT.Interop.WindowNative.GetWindowHandle(window);
+        WindowId windowId = Win32Interop.GetWindowIdFromWindow(hWnd);
+        AppWindow appWindow = AppWindow.GetFromWindowId(windowId);
+        appWindow.SetIcon(@"Assets\icon.ico");
+    }
+}