[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/MouseWithoutBordersPage.xaml

@@ -11,7 +11,6 @@
     AutomationProperties.LandmarkType="Main"
     mc:Ignorable="d">
     <Page.Resources>
-        <converters:BoolToVisibilityConverter x:Key="negativeBoolToVisibilityConverter" />
         <converters:BoolToObjectConverter
             x:Key="OneRowMatrixBoolToNumberOfRowsConverter"
             FalseValue="2"
@@ -75,7 +74,7 @@
                                 x:Uid="MouseWithoutBorders_Connect"
                                 Command="{x:Bind ShowConnectFieldsCommand, Mode=OneTime}"
                                 Style="{StaticResource AccentButtonStyle}"
-                                Visibility="{x:Bind Path=ViewModel.ConnectFieldsVisible, Mode=OneWay, Converter={StaticResource negativeBoolToVisibilityConverter}, ConverterParameter=True}" />
+                                Visibility="{x:Bind Path=ViewModel.ConnectFieldsVisible, Mode=OneWay, Converter={StaticResource ReverseBoolToVisibilityConverter}, ConverterParameter=True}" />
                         </StackPanel>
                     </tkcontrols:SettingsExpander>