Add aspect ratio checkbox to ZoomIt UI (#47695)

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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
Exposes the 16:9 aspect ratio toggle for the ZoomIt screen region
recording (default: `Ctrl`+`Shift`+`5`) in the settings UI.

<img width="1047" height="817" alt="image"
src="https://github.com/user-attachments/assets/4117a6a1-9f57-44c5-9a21-1b1b65bc2992"
/>

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## PR Checklist

- [ ] Closes: #xxx
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issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
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## Detailed Description of the Pull Request / Additional comments

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wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed
Checked that the toggle works and that it's compatible with the
standalone ZoomIt, too.

src/settings-ui/Settings.UI.Library/ZoomItProperties.cs

@@ -117,6 +117,8 @@ namespace Microsoft.PowerToys.Settings.UI.Library
 
         public IntProperty WebcamShape { get; set; }
 
+        public BoolProperty RecordAspectRatio { get; set; }
+
         public BoolProperty BreakLockWorkstation { get; set; }
     }
 }

src/settings-ui/Settings.UI/SettingsXAML/Views/ZoomItPage.xaml

@@ -272,6 +272,9 @@
                                     TickPlacement="Outside"
                                     Value="{x:Bind ViewModel.RecordScaling, Mode=TwoWay}" />
                             </tkcontrols:SettingsCard>
+                            <tkcontrols:SettingsCard Name="ZoomItRecordAspectRatio" ContentAlignment="Left">
+                                <CheckBox x:Uid="ZoomIt_Record_AspectRatio" IsChecked="{x:Bind ViewModel.RecordAspectRatio, Mode=TwoWay}" />
+                            </tkcontrols:SettingsCard>
                             <tkcontrols:SettingsCard Name="ZoomItRecordFormat" x:Uid="ZoomIt_Record_Format">
                                 <ComboBox MinWidth="{StaticResource SettingActionControlMinWidth}" SelectedIndex="{x:Bind ViewModel.RecordFormatIndex, Mode=TwoWay}">
                                     <ComboBoxItem>GIF</ComboBoxItem>

src/settings-ui/Settings.UI/Strings/en-us/Resources.resw

@@ -4872,6 +4872,9 @@ The break timer font matches the text font.</value>
   <data name="ZoomIt_Record_WebcamShape_Circle.Content" xml:space="preserve">
     <value>Circle</value>
   </data>
+  <data name="ZoomIt_Record_AspectRatio.Content" xml:space="preserve">
+    <value>Lock region selection to 16:9 aspect ratio</value>
+  </data>
   <data name="ZoomIt_Break_LockWorkstation.Content" xml:space="preserve">
     <value>Lock workstation during break</value>
   </data>

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

@@ -1113,6 +1113,20 @@ namespace Microsoft.PowerToys.Settings.UI.ViewModels
             }
         }
 
+        public bool RecordAspectRatio
+        {
+            get => _zoomItSettings.Properties.RecordAspectRatio.Value;
+            set
+            {
+                if (_zoomItSettings.Properties.RecordAspectRatio.Value != value)
+                {
+                    _zoomItSettings.Properties.RecordAspectRatio.Value = value;
+                    OnPropertyChanged(nameof(RecordAspectRatio));
+                    NotifySettingsChanged();
+                }
+            }
+        }
+
         private void NotifySettingsChanged()
         {
             global::PowerToys.ZoomItSettingsInterop.ZoomItSettings.SaveSettingsJson(