[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/App.xaml

@@ -3,17 +3,20 @@
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:controls="using:Microsoft.PowerToys.Settings.UI.Controls"
+    xmlns:converters="using:Microsoft.PowerToys.Settings.UI.Converters"
     xmlns:tkconverters="using:CommunityToolkit.WinUI.Converters">
     <Application.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>
                 <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
                 <ResourceDictionary Source="/SettingsXAML/Controls/KeyVisual/KeyVisual.xaml" />
+                <ResourceDictionary Source="/SettingsXAML/Controls/KeyVisual/KeyCharPresenter.xaml" />
                 <ResourceDictionary Source="/SettingsXAML/Styles/TextBlock.xaml" />
                 <ResourceDictionary Source="/SettingsXAML/Styles/Button.xaml" />
                 <ResourceDictionary Source="/SettingsXAML/Styles/InfoBadge.xaml" />
                 <ResourceDictionary Source="/SettingsXAML/Themes/Colors.xaml" />
                 <ResourceDictionary Source="/SettingsXAML/Themes/Generic.xaml" />
+
                 <!--  Other merged dictionaries here  -->
             </ResourceDictionary.MergedDictionaries>
 
@@ -26,19 +29,28 @@
                 x:Key="BoolToVisibilityConverter"
                 FalseValue="Collapsed"
                 TrueValue="Visible" />
-
             <tkconverters:BoolToObjectConverter
                 x:Key="BoolToComboBoxIndexConverter"
                 FalseValue="0"
                 TrueValue="1" />
-
             <tkconverters:BoolToObjectConverter
                 x:Key="ReverseBoolToComboBoxIndexConverter"
                 FalseValue="1"
                 TrueValue="0" />
-
+            <tkconverters:DoubleToVisibilityConverter
+                x:Name="DoubleToVisibilityConverter"
+                FalseValue="Collapsed"
+                GreaterThan="0"
+                TrueValue="Visible" />
+            <tkconverters:DoubleToVisibilityConverter
+                x:Name="DoubleToInvertedVisibilityConverter"
+                FalseValue="Visible"
+                GreaterThan="0"
+                TrueValue="Collapsed" />
             <tkconverters:StringFormatConverter x:Key="StringFormatConverter" />
             <tkconverters:BoolNegationConverter x:Key="BoolNegationConverter" />
+            <converters:UpdateStateToBoolConverter x:Key="UpdateStateToBoolConverter" />
+
             <x:Double x:Key="SettingsCardSpacing">2</x:Double>
 
             <!--  Overrides  -->
@@ -46,6 +58,7 @@
             <Thickness x:Key="InfoBarContentRootPadding">16,0,0,0</Thickness>
             <x:Double x:Key="SettingActionControlMinWidth">240</x:Double>
 
+            <x:Double x:Key="PageMaxWidth">1000</x:Double>
 
             <Style TargetType="ListViewItem">
                 <Setter Property="Margin" Value="0,0,0,2" />
@@ -55,7 +68,6 @@
             </Style>
 
             <Style BasedOn="{StaticResource DefaultCheckBoxStyle}" TargetType="controls:CheckBoxWithDescriptionControl" />
-            <!--  Other app resources here  -->
 
             <TransitionCollection x:Key="SettingsCardsAnimations">
                 <EntranceThemeTransition FromVerticalOffset="50" />
@@ -63,6 +75,9 @@
                 <RepositionThemeTransition IsStaggeringEnabled="False" />
                 <!--  Smoothly animates individual cards upon whenever Expanders are expanded/collapsed  -->
             </TransitionCollection>
+
+            <!--  Additional resources or settings can be added here  -->
+
         </ResourceDictionary>
     </Application.Resources>
 </Application>