Always on top: window context menu to always on top (#45773)

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fix/what does it change/how was it tested (even manually, if necessary)?
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## Summary of the Pull Request

Add an option to enable inject a window context menu to always on top
this window.

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## PR Checklist

- [ ] Closes: #45638 #15387
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issues) -->
- [ ] **Communication:** I've discussed this with core contributors
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- [ ] **Tests:** Added/updated and all pass
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- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
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and link it here: #xxx

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## Detailed Description of the Pull Request / Additional comments

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## Validation Steps Performed

https://github.com/user-attachments/assets/37eb3f74-1ccc-42f2-83c3-1100f55765ee

---------

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

src/settings-ui/Settings.UI/ViewModels/AlwaysOnTopViewModel.cs

@@ -50,6 +50,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
             Settings = moduleSettingsRepository.SettingsConfig;
 
             _hotkey = Settings.Properties.Hotkey.Value;
+            _showInSystemMenu = Settings.Properties.ShowInSystemMenu.Value;
             _frameEnabled = Settings.Properties.FrameEnabled.Value;
             _frameThickness = Settings.Properties.FrameThickness.Value;
             _frameColor = Settings.Properties.FrameColor.Value;
@@ -164,6 +165,21 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
             }
         }
 
+        public bool ShowInSystemMenu
+        {
+            get => _showInSystemMenu;
+
+            set
+            {
+                if (value != _showInSystemMenu)
+                {
+                    _showInSystemMenu = value;
+                    Settings.Properties.ShowInSystemMenu.Value = value;
+                    NotifyPropertyChanged();
+                }
+            }
+        }
+
         public int FrameThickness
         {
             get => _frameThickness;
@@ -336,6 +352,7 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
         private bool _enabledStateIsGPOConfigured;
         private bool _isEnabled;
         private HotkeySettings _hotkey;
+        private bool _showInSystemMenu;
         private bool _frameEnabled;
         private int _frameThickness;
         private string _frameColor;