[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/CmdNotFoundPage.xaml

@@ -10,13 +10,6 @@
     xmlns:ui="using:CommunityToolkit.WinUI"
     AutomationProperties.LandmarkType="Main"
     mc:Ignorable="d">
-    <Page.Resources>
-        <tkconverters:BoolToVisibilityConverter
-            x:Key="BoolToInvertedVisibilityConverter"
-            FalseValue="Visible"
-            TrueValue="Collapsed" />
-        <tkconverters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
-    </Page.Resources>
     <controls:SettingsPageControl x:Uid="CmdNotFound" ModuleImageSource="ms-appx:///Assets/Settings/Modules/CmdNotFound.png">
         <controls:SettingsPageControl.ModuleContent>
             <StackPanel ChildrenTransitions="{StaticResource SettingsCardsAnimations}" Orientation="Vertical">