[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/IsEnabledTextBlock.xaml.cs

@@ -0,0 +1,52 @@
+// 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.ComponentModel;
+
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+
+namespace Microsoft.PowerToys.Settings.UI.Controls
+{
+    [TemplateVisualState(Name = "Normal", GroupName = "CommonStates")]
+    [TemplateVisualState(Name = "Disabled", GroupName = "CommonStates")]
+    public partial class IsEnabledTextBlock : Control
+    {
+        public IsEnabledTextBlock()
+        {
+            this.Style = (Style)App.Current.Resources["DefaultIsEnabledTextBlockStyle"];
+        }
+
+        protected override void OnApplyTemplate()
+        {
+            IsEnabledChanged -= IsEnabledTextBlock_IsEnabledChanged;
+            SetEnabledState();
+            IsEnabledChanged += IsEnabledTextBlock_IsEnabledChanged;
+            base.OnApplyTemplate();
+        }
+
+        public static readonly DependencyProperty TextProperty = DependencyProperty.Register(
+           "Text",
+           typeof(string),
+           typeof(IsEnabledTextBlock),
+           null);
+
+        [Localizable(true)]
+        public string Text
+        {
+            get => (string)GetValue(TextProperty);
+            set => SetValue(TextProperty, value);
+        }
+
+        private void IsEnabledTextBlock_IsEnabledChanged(object sender, DependencyPropertyChangedEventArgs e)
+        {
+            SetEnabledState();
+        }
+
+        private void SetEnabledState()
+        {
+            VisualStateManager.GoToState(this, IsEnabled ? "Normal" : "Disabled", true);
+        }
+    }
+}