feat(resource): refactor heap management & suballocation

Major overhaul of GPU resource/heap management:
- Replace resource pooling and upload buffer logic with transient heap/page-based suballocation in ResourceManager.
- Add support for suballocation and heap flags/types, with D3D12 helpers.
- Remove ICommandBuffer.UploadBuffer/UploadTexture; add UpdateSubResources and CopyBuffer, move upload logic to RenderingContext.
- Refactor D3D12ResourceAllocator/Database for suballocation, heap flags, and mapping.
- Standardize on Handle<GPUBuffer> usage.
- Update meshlet/mesh utilities for new allocation handles and memory pools.
- Refactor RenderGraph and docs to use "heap" terminology.
- Use cpuFrame/gpuFrame consistently for frame sync.
- Add s2h.hlsl, s2h_3d.hlsl, s2h_scatter.hlsl shader debug libs.
- Miscellaneous fixes, cleanup, and dependency updates.

BREAKING CHANGE: Resource pooling and upload APIs replaced with new heap/page-based suballocation system. Update all buffer/texture creation and upload code to use new ResourceManager and ICommandBuffer methods.

src/Editor/Ghost.Editor/Properties/Resources.Designer.cs

@@ -13,7 +13,7 @@ namespace Ghost.Editor.Properties {
     
     
     /// <summary>
-    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    ///   A strongly-typed heap class, for looking up localized strings, etc.
     /// </summary>
     // This class was auto-generated by the StronglyTypedResourceBuilder
     // class via a tool like ResGen or Visual Studio.
@@ -48,7 +48,7 @@ namespace Ghost.Editor.Properties {
         
         /// <summary>
         ///   Overrides the current thread's CurrentUICulture property for all
-        ///   resource lookups using this strongly typed resource class.
+        ///   heap lookups using this strongly typed heap class.
         /// </summary>
         [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
         internal static global::System.Globalization.CultureInfo Culture {

src/Editor/Ghost.Editor/Themes/DockingDictionary.xaml

@@ -1,6 +1,4 @@
-<ResourceDictionary
-    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
 
     <ResourceDictionary.MergedDictionaries>
         <ResourceDictionary Source="/View/Controls/Docking/DockingLayout.xaml" />

src/Editor/Ghost.Editor/Utilities/Converters/AssetPathToGlyphConverter.cs

@@ -18,7 +18,7 @@ public partial class AssetPathToGlyphConverter : IValueConverter
 
         var extension = Path.GetExtension(path).ToLowerInvariant();
 
-        // TODO: Use resource dictionary for icons.
+        // TODO: Use heap dictionary for icons.
         return extension switch
         {
             ".ghostscene" => "\uF159",

src/Editor/Ghost.Editor/View/Controls/Docking/DockDocument.xaml

@@ -10,9 +10,10 @@
             <Setter.Value>
                 <ControlTemplate TargetType="local:DockDocument">
                     <Border Background="Transparent">
-                        <ContentPresenter Content="{TemplateBinding Content}"
-                                          HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
-                                          VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
+                        <ContentPresenter
+                            HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
+                            VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
+                            Content="{TemplateBinding Content}" />
                     </Border>
                 </ControlTemplate>
             </Setter.Value>

src/Editor/Ghost.Editor/View/Controls/Docking/DockGroup.cs

@@ -157,7 +157,7 @@ public partial class DockGroup : DockContainer
                         Content = doc
                     };
 
-                    existingTab.SetBinding(TabViewItem.HeaderProperty, new Microsoft.UI.Xaml.Data.Binding
+                    existingTab.SetBinding(TabViewItem.HeaderProperty, new Binding
                     {
                         Source = doc,
                         Path = new PropertyPath(nameof(DockDocument.Title)),

src/Editor/Ghost.Editor/View/Controls/Docking/DockRegionHighlight.xaml

@@ -7,7 +7,12 @@
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="local:DockRegionHighlight">
-                    <Border Background="{ThemeResource SystemControlHighlightAccentBrush}" Opacity="0.25" BorderBrush="{ThemeResource SystemControlHighlightAccentBrush}" BorderThickness="2" CornerRadius="4" />
+                    <Border
+                        Background="{ThemeResource SystemControlHighlightAccentBrush}"
+                        BorderBrush="{ThemeResource SystemControlHighlightAccentBrush}"
+                        BorderThickness="2"
+                        CornerRadius="4"
+                        Opacity="0.25" />
                 </ControlTemplate>
             </Setter.Value>
         </Setter>

src/Editor/Ghost.Editor/View/Controls/ProjectBrowser.xaml.cs

@@ -108,7 +108,7 @@ internal sealed partial class ProjectBrowser : UserControl
         _isUpdatingSelection = false;
     }
 
-    private async void PART_FilesView_DoubleTapped(object sender, Microsoft.UI.Xaml.Input.DoubleTappedRoutedEventArgs e)
+    private async void PART_FilesView_DoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
     {
         if (PART_FilesView.SelectedItem is ExplorerItem selectedItem)
         {