Empty WPF app crashes when published as a self-contained single file on .NET 11 Preview 7

### Description

A new empty WPF application targeting .NET 11 crashes on startup when published as a self-contained single-file application.

The failure occurs both with and without `IncludeNativeLibrariesForSelfExtract=true`. Ordinary non-single-file self-contained publishing works correctly.

This appears related to:

- https://github.com/dotnet/wpf/pull/11575
- https://github.com/dotnet/wpf/issues/11651
- https://github.com/dotnet/wpf/pull/11664

PR #11575 changed `DirectWriteForwarder.dll` and `System.Printing.dll` from pure MSIL to IJW mixed-mode assemblies. PR #11664 fixed ordinary self-contained publishing by packaging `ijwhost.dll` as a native runtime asset, but single-file publishing still bundles `DirectWriteForwarder.dll` and it fails during startup.

### Reproduction Steps

Using .NET SDK `11.0.100-preview.7.26381.103`:

```powershell
dotnet new wpf -n WpfSingleFileRepro -f net11.0
cd WpfSingleFileRepro

dotnet publish -c Release -r win-x64 --self-contained true `
-p:PublishSingleFile=true `
-p:IncludeNativeLibrariesForSelfExtract=true `
-o .\publish-single

.\publish-single\WpfSingleFileRepro.exe
```

### Expected behavior

The empty WPF application should start and display its window.

### Actual behavior

The process terminates during `System.Windows.Application` initialization with exit code `0xE0434352`:

```text
Unhandled exception. System.TypeInitializationException:
The type initializer for 'System.Windows.Application' threw an exception.

---> System.TypeInitializationException:
The type initializer for '' threw an exception.

---> System.BadImageFormatException:
File name: '...\publish-single\DirectWriteForwarder.dll'

at System.Windows.Application.ApplicationInit()
at System.Windows.Application..ctor()
at WpfSingleFileRepro.App.Main()
```

### Regression?

_No response_

### Known Workarounds

_No response_

### Impact

_No response_

### Configuration

SDK: 11.0.100-preview.7.26381.103
Runtime: 11.0.0-preview.7.26381.103
MSBuild: 18.10.0-1.26381.103
OS: Windows 11, build 10.0.26200

### Other information

_No response_

Reproduce the failure with the documented .NET SDK, WPF template, and single-file publish commands, then read PRs #11575 and #11664 plus issue #11651 for the mixed-mode assembly packaging changes. Done means the published empty WPF application starts and displays its window without the DirectWriteForwarder.dll BadImageFormatException.

Written by the indexing model from the issue text.