[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/Controls/Dashboard/CheckUpdateControl.xaml.cs

@@ -0,0 +1,30 @@
+// 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 Microsoft.PowerToys.Settings.UI.Library;
+using Microsoft.PowerToys.Settings.UI.Services;
+using Microsoft.PowerToys.Settings.UI.Views;
+using Microsoft.UI.Xaml.Controls;
+
+namespace Microsoft.PowerToys.Settings.UI.Controls
+{
+    public sealed partial class CheckUpdateControl : UserControl
+    {
+        public bool UpdateAvailable { get; set; }
+
+        public UpdatingSettings UpdateSettingsConfig { get; set; }
+
+        public CheckUpdateControl()
+        {
+            InitializeComponent();
+            UpdateSettingsConfig = UpdatingSettings.LoadSettings();
+            UpdateAvailable = UpdateSettingsConfig != null && (UpdateSettingsConfig.State == UpdatingSettings.UpdatingState.ReadyToInstall || UpdateSettingsConfig.State == UpdatingSettings.UpdatingState.ReadyToDownload);
+        }
+
+        private void SWVersionButtonClicked(object sender, Microsoft.UI.Xaml.RoutedEventArgs e)
+        {
+            NavigationService.Navigate(typeof(GeneralPage));
+        }
+    }
+}