[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/PowerToys.Settings.csproj

@@ -22,6 +22,9 @@
   <ItemGroup>
     <None Remove="Assets\Settings\Modules\APDialog.dark.png" />
     <None Remove="Assets\Settings\Modules\APDialog.light.png" />
+    <None Remove="SettingsXAML\Controls\Dashboard\CheckUpdateControl.xaml" />
+    <None Remove="SettingsXAML\Controls\Dashboard\ShortcutConflictControl.xaml" />
+    <None Remove="SettingsXAML\Controls\KeyVisual\KeyCharPresenter.xaml" />
   </ItemGroup>
   <ItemGroup>
     <Page Remove="SettingsXAML\App.xaml" />
@@ -132,6 +135,15 @@
     <None Update="Assets\Settings\Scripts\DisableModule.ps1">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <Page Update="SettingsXAML\Controls\KeyVisual\KeyCharPresenter.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Update="SettingsXAML\Controls\Dashboard\ShortcutConflictControl.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
+    <Page Update="SettingsXAML\Controls\Dashboard\CheckUpdateControl.xaml">
+      <Generator>MSBuild:Compile</Generator>
+    </Page>
   </ItemGroup>
 
   <ItemGroup>