[Keyboard Manager] Updated WinUI3 KBM and toggles (#45649)

## Running the Project
**Option 1: Test via runner**
1. Check out branch `niels9001/kbm-ux-consolidation`
2. Build PowerToys project
3. Manually build `Modules/KeyboardManagerEditorUI` project separately
4. Run `runner` project
5. Ensure experimental features are enabled in general settings (should
be on by default)
6. Launch keyboard manager via settings app

**Option 2: Test via installer**
1. Install PowerToys via installer on azure pipeline
1. Launch keyboard manager

## Validation
For each page (Text, Remappings, Programs, URLs):
* Create shortcuts with variable options and ensure they run as expected
* Delete shortcuts and ensure they no longer execute
* Try to create invalid shortcuts to check for proper validation
* Ensure created shortcuts appear in Power Toys Settings Keyboard
manager page
* Try toggling shortcuts
* Try deleting shortcuts while toggled off

### UI
* Any feedback on UI design appreciated as well
<img width="1071" height="671" alt="image"
src="https://github.com/user-attachments/assets/d2e81de0-6d92-4189-9a33-32e94cce74f7"
/>
<img width="2142" height="1341" alt="image"
src="https://github.com/user-attachments/assets/0e4e5685-fdf1-4dfd-ba52-a2e5bc9a66db"
/>



Closes: #15870
Closes: #31902
Closes: #45302
Closes: #36227
Closes: #16093
Closes: #13409
Closes: #9919
Closes:  #9482
Closes: #8798
Closes:  #7054
Closes: #2733
Closes: #2027
Closes: #30167

---------

Co-authored-by: Hao Liu <liuhao3418@gmail.com>
Co-authored-by: chenmy77 <162882040+chenmy77@users.noreply.github.com>
Co-authored-by: Niels Laute <niels.laute@live.nl>
Co-authored-by: Jay <65828559+Jay-o-Way@users.noreply.github.com>
Co-authored-by: Jaylyn Barbee <51131738+Jaylyn-Barbee@users.noreply.github.com>
Co-authored-by: Dustin L. Howett <duhowett@microsoft.com>

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.PowerToys/Commands/KeyboardManager/OpenNewKeyboardManagerEditorCommand.cs

@@ -0,0 +1,35 @@
+// Copyright (c) Microsoft Corporation
+// 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.Threading;
+using Microsoft.CommandPalette.Extensions.Toolkit;
+using PowerToys.Interop;
+
+namespace PowerToysExtension.Commands;
+
+/// <summary>
+/// Opens the new Keyboard Manager editor.
+/// </summary>
+internal sealed partial class OpenNewKeyboardManagerEditorCommand : InvokableCommand
+{
+    public OpenNewKeyboardManagerEditorCommand()
+    {
+        Name = "Open New Keyboard Manager Editor";
+    }
+
+    public override CommandResult Invoke()
+    {
+        try
+        {
+            using var evt = new EventWaitHandle(false, EventResetMode.AutoReset, Constants.OpenNewKeyboardManagerEvent());
+            evt.Set();
+            return CommandResult.Dismiss();
+        }
+        catch (Exception ex)
+        {
+            return CommandResult.ShowToast($"Failed to open New Keyboard Manager Editor: {ex.Message}");
+        }
+    }
+}

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.PowerToys/Modules/KeyboardManagerModuleCommandProvider.cs

@@ -2,7 +2,10 @@
 // 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.Collections.Generic;
+using System.IO;
+using System.Text.Json;
 using Microsoft.CommandPalette.Extensions.Toolkit;
 using PowerToysExtension.Commands;
 using PowerToysExtension.Helpers;
@@ -18,6 +21,16 @@ internal sealed class KeyboardManagerModuleCommandProvider : ModuleCommandProvid
         var title = SettingsWindow.KBM.ModuleDisplayName();
         var icon = SettingsWindow.KBM.ModuleIcon();
 
+        if (IsUseNewEditorEnabled())
+        {
+            yield return new ListItem(new OpenNewKeyboardManagerEditorCommand())
+            {
+                Title = Resources.KeyboardManager_OpenNewEditor_Title,
+                Subtitle = Resources.KeyboardManager_OpenNewEditor_Subtitle,
+                Icon = icon,
+            };
+        }
+
         yield return new ListItem(new OpenInSettingsCommand(SettingsWindow.KBM, title) { Id = "com.microsoft.powertoys.keyboardManager.openSettings" })
         {
             Title = title,
@@ -25,4 +38,37 @@ internal sealed class KeyboardManagerModuleCommandProvider : ModuleCommandProvid
             Icon = icon,
         };
     }
+
+    private static bool IsUseNewEditorEnabled()
+    {
+        try
+        {
+            var settingsPath = Path.Combine(
+                Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+                "Microsoft",
+                "PowerToys",
+                "Keyboard Manager",
+                "settings.json");
+
+            if (!File.Exists(settingsPath))
+            {
+                return false;
+            }
+
+            var json = File.ReadAllText(settingsPath);
+            using var doc = JsonDocument.Parse(json);
+
+            if (doc.RootElement.TryGetProperty("properties", out var properties) &&
+                properties.TryGetProperty("useNewEditor", out var useNewEditor))
+            {
+                return useNewEditor.GetBoolean();
+            }
+        }
+        catch
+        {
+            // If we can't read the setting, default to not showing the command
+        }
+
+        return false;
+    }
 }

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.PowerToys/Properties/Resources.Designer.cs

@@ -861,6 +861,24 @@ namespace PowerToysExtension.Properties {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Keyboard Manager: Open Editor.
+        /// </summary>
+        internal static string KeyboardManager_OpenNewEditor_Title {
+            get {
+                return ResourceManager.GetString("KeyboardManager_OpenNewEditor_Title", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Open the Keyboard Manager remap editor.
+        /// </summary>
+        internal static string KeyboardManager_OpenNewEditor_Subtitle {
+            get {
+                return ResourceManager.GetString("KeyboardManager_OpenNewEditor_Subtitle", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Open Light Switch settings.
         /// </summary>

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.PowerToys/Properties/Resources.resx

@@ -408,6 +408,12 @@
   <data name="KeyboardManager_Settings_Subtitle" xml:space="preserve">
     <value>Open Keyboard Manager settings</value>
   </data>
+  <data name="KeyboardManager_OpenNewEditor_Title" xml:space="preserve">
+    <value>Keyboard Manager: Open Editor</value>
+  </data>
+  <data name="KeyboardManager_OpenNewEditor_Subtitle" xml:space="preserve">
+    <value>Open the Keyboard Manager remap editor</value>
+  </data>
   <!-- Light Switch Module -->
   <data name="LightSwitch_Toggle_Title" xml:space="preserve">
     <value>Light Switch: Toggle theme</value>