[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)

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## 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/MainWindow.xaml.cs

@@ -8,6 +8,7 @@ using Microsoft.CmdPal.Common.Helpers;
 using Microsoft.CmdPal.Common.Messages;
 using Microsoft.CmdPal.Common.Services;
 using Microsoft.CmdPal.UI.Events;
+using Microsoft.CmdPal.UI.Helpers;
 using Microsoft.CmdPal.UI.ViewModels;
 using Microsoft.CmdPal.UI.ViewModels.Messages;
 using Microsoft.Extensions.DependencyInjection;
@@ -71,6 +72,7 @@ public sealed partial class MainWindow : Window,
         // notification area icon back
         WM_TASKBAR_RESTART = PInvoke.RegisterWindowMessage("TaskbarCreated");
 
+        this.SetIcon();
         AppWindow.Title = RS_.GetString("AppName");
         AppWindow.Resize(new SizeInt32 { Width = 1000, Height = 620 });
         PositionCentered();