[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/ToastWindow.xaml.cs

@@ -4,19 +4,16 @@
 
 using CommunityToolkit.Mvvm.Messaging;
 using CommunityToolkit.WinUI;
+using Microsoft.CmdPal.UI.Helpers;
 using Microsoft.CmdPal.UI.ViewModels;
 using Microsoft.CmdPal.UI.ViewModels.Messages;
-using Microsoft.UI.Composition;
-using Microsoft.UI.Composition.SystemBackdrops;
 using Microsoft.UI.Dispatching;
 using Microsoft.UI.Windowing;
 using Microsoft.UI.Xaml;
 using Windows.Graphics;
-using Windows.UI;
 using Windows.Win32;
 using Windows.Win32.Foundation;
 using Windows.Win32.UI.WindowsAndMessaging;
-using WinRT;
 using RS_ = Microsoft.CmdPal.UI.Helpers.ResourceLoaderInstance;
 
 namespace Microsoft.CmdPal.UI;
@@ -37,7 +34,7 @@ public sealed partial class ToastWindow : Window,
         AppWindow.IsShownInSwitchers = false;
         ExtendsContentIntoTitleBar = true;
         AppWindow.SetPresenter(AppWindowPresenterKind.CompactOverlay);
-        AppWindow.SetIcon("ms-appx:///Assets/Icons/StoreLogo.png");
+        this.SetIcon();
         AppWindow.Title = RS_.GetString("ToastWindowTitle");
         AppWindow.TitleBar.PreferredHeightOption = TitleBarHeightOption.Collapsed;