[Peek]Add setting to close after losing focus (#26364)

* [Peek] WindowActivationState checks are added for focus and close after losing focus.

* Add setting to activate the behavior

---------

Co-authored-by: Jaime Bernardo <jaime@janeasystems.com>

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

@@ -12,12 +12,15 @@ namespace Microsoft.PowerToys.Settings.UI.Library
         {
             ActivationShortcut = new HotkeySettings(false, true, false, false, 0x20);
             AlwaysRunNotElevated = new BoolProperty(true);
+            CloseAfterLosingFocus = new BoolProperty(false);
         }
 
         public HotkeySettings ActivationShortcut { get; set; }
 
         public BoolProperty AlwaysRunNotElevated { get; set; }
 
+        public BoolProperty CloseAfterLosingFocus { get; set; }
+
         public override string ToString() => JsonSerializer.Serialize(this);
     }
 }

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

@@ -2,6 +2,8 @@
 // The Microsoft Corporation licenses this file to you under the MIT license.
 // See the LICENSE file in the project root for more information.
 
+using System;
+using System.Text.Json;
 using System.Text.Json.Serialization;
 using Microsoft.PowerToys.Settings.UI.Library.Interfaces;
 
@@ -31,5 +33,21 @@ namespace Microsoft.PowerToys.Settings.UI.Library
         {
             return false;
         }
+
+        public virtual void Save(ISettingsUtils settingsUtils)
+        {
+            // Save settings to file
+            var options = new JsonSerializerOptions
+            {
+                WriteIndented = true,
+            };
+
+            if (settingsUtils == null)
+            {
+                throw new ArgumentNullException(nameof(settingsUtils));
+            }
+
+            settingsUtils.SaveSettings(JsonSerializer.Serialize(this, options), ModuleName);
+        }
     }
 }