[UX] New dashboard & refactored KeyVisual (#40214)

### Updated `KeyVisual` and `Shortcut` control
- Refactoring `KeyVisual` to remove redundant properties and UI
elements, and using Styles for better customization.
- Shortcut control now shows a "Configure shortcut" label when there's
no shortcut configured.

### Other changes
- Consolidated converters that were used across pages in `App.xaml.cs`
with consistent naming.
- Renamed templated controls (from `.cs` to `.xaml.cs`) and moving those
to the `Controls` root folder vs. individual folders for a better
overview.
<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist

Closes #39520
Closes #32944

---------

Co-authored-by: Jay <65828559+Jay-o-Way@users.noreply.github.com>
Co-authored-by: Jaylyn Barbee <51131738+Jaylyn-Barbee@users.noreply.github.com>

src/settings-ui/Settings.UI/SettingsXAML/Views/DashboardPage.xaml.cs

@@ -5,10 +5,10 @@
 using System;
 using System.Threading;
 using System.Threading.Tasks;
-
 using ManagedCommon;
 using Microsoft.PowerToys.Settings.UI.Helpers;
 using Microsoft.PowerToys.Settings.UI.Library;
+using Microsoft.PowerToys.Settings.UI.OOBE.Enums;
 using Microsoft.PowerToys.Settings.UI.OOBE.Views;
 using Microsoft.PowerToys.Settings.UI.ViewModels;
 using Microsoft.UI.Xaml;
@@ -46,14 +46,23 @@ namespace Microsoft.PowerToys.Settings.UI.Views
             ViewModel.ModuleEnabledChangedOnSettingsPage();
         }
 
-        private void SWVersionButtonClicked(object sender, RoutedEventArgs e)
-        {
-            ViewModel.SWVersionButtonClicked();
-        }
-
         private void DashboardListItemClick(object sender, RoutedEventArgs e)
         {
             ViewModel.DashboardListItemClick(sender);
         }
+
+        private void WhatsNewButton_Click(object sender, RoutedEventArgs e)
+        {
+            if (App.GetOobeWindow() == null)
+            {
+                App.SetOobeWindow(new OobeWindow(PowerToysModules.WhatsNew));
+            }
+            else
+            {
+                App.GetOobeWindow().SetAppWindow(PowerToysModules.WhatsNew);
+            }
+
+            App.GetOobeWindow().Activate();
+        }
     }
 }