[Peek] Use WebView2 for SVG preview to improve compatibility (#44209)

<!-- Enter a brief description/summary of your PR here. What does it
fix/what does it change/how was it tested (even manually, if necessary)?
-->
## Summary of the Pull Request
Improves SVG preview compatibility in Peek by using WebView2 instead of
`SvgImageSource`.
## Problem

`SvgImageSource` has limited SVG feature support and fails to render
SVGs with advanced features like `clipPath`, complex gradients, or
certain namespace configurations. This results in black previews or
icon-only display for many SVG files.

## Solution

Render SVG files using WebView2 which provides full SVG specification
support through the browser engine.

<img width="1973" height="1314" alt="image"
src="https://github.com/user-attachments/assets/a4eb2ff5-d76f-4f7f-87e3-6404e18b2b09"
/>

<img width="1997" height="1358" alt="image"
src="https://github.com/user-attachments/assets/7ce4dd69-7fba-447e-8499-d37af3f02c4d"
/>
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## PR Checklist

- [x] Closes: #44193
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

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or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

src/modules/peek/Peek.FilePreviewer/Previewers/MediaPreviewer/ImagePreviewer.cs

@@ -54,8 +54,6 @@ namespace Peek.FilePreviewer.Previewers
 
         private bool IsPng() => Item.Extension == ".png";
 
-        private bool IsSvg() => Item.Extension == ".svg";
-
         private bool IsQoi() => Item.Extension == ".qoi";
 
         private DispatcherQueue Dispatcher { get; }
@@ -63,7 +61,7 @@ namespace Peek.FilePreviewer.Previewers
         private static readonly HashSet<string> _supportedFileTypes =
             BitmapDecoder.GetDecoderInformationEnumerator()
                 .SelectMany(di => di.FileExtensions)
-                .Union([".svg", ".qoi"])
+                .Union([".qoi"])
                 .ToHashSet(StringComparer.OrdinalIgnoreCase);
 
         public static bool IsItemSupported(IFileSystemItem item)
@@ -75,15 +73,7 @@ namespace Peek.FilePreviewer.Previewers
         {
             cancellationToken.ThrowIfCancellationRequested();
 
-            if (IsSvg())
-            {
-                var size = await Task.Run(Item.GetSvgSize);
-                if (size != null)
-                {
-                    ImageSize = size.Value;
-                }
-            }
-            else if (IsQoi())
+            if (IsQoi())
             {
                 var size = await Task.Run(Item.GetQoiSize);
                 if (size != null)
@@ -176,31 +166,16 @@ namespace Peek.FilePreviewer.Previewers
                 {
                     cancellationToken.ThrowIfCancellationRequested();
 
-                    using FileStream stream = ReadHelper.OpenReadOnly(Item.Path);
-
-                    if (IsSvg())
-                    {
-                        var source = new SvgImageSource();
-                        source.RasterizePixelHeight = ImageSize?.Height ?? 0;
-                        source.RasterizePixelWidth = ImageSize?.Width ?? 0;
-
-                        var loadStatus = await source.SetSourceAsync(stream.AsRandomAccessStream());
-                        if (loadStatus != SvgImageSourceLoadStatus.Success)
-                        {
-                            Logger.LogError("Error loading SVG: " + loadStatus.ToString());
-                            throw new ImageLoadingException(nameof(source));
-                        }
-
-                        Preview = source;
-                    }
-                    else if (IsQoi())
+                    if (IsQoi())
                     {
+                        using FileStream stream = ReadHelper.OpenReadOnly(Item.Path);
                         using var bitmap = QoiImage.FromStream(stream);
 
                         Preview = await BitmapHelper.BitmapToImageSource(bitmap, true, cancellationToken);
                     }
                     else
                     {
+                        using FileStream stream = ReadHelper.OpenReadOnly(Item.Path);
                         Preview = new BitmapImage();
                         await ((BitmapImage)Preview).SetSourceAsync(stream.AsRandomAccessStream());
                     }

src/modules/peek/Peek.FilePreviewer/Previewers/WebBrowserPreviewer/WebBrowserPreviewer.cs

@@ -33,6 +33,10 @@ namespace Peek.FilePreviewer.Previewers
 
             // Markdown
             ".md",
+
+            // SVG - using WebView2 for better compatibility with complex SVGs
+            // (e.g., from Adobe Illustrator, Inkscape)
+            ".svg",
         };
 
         [ObservableProperty]
@@ -111,9 +115,10 @@ namespace Peek.FilePreviewer.Previewers
                 {
                     bool isHtml = File.Extension == ".html" || File.Extension == ".htm";
                     bool isMarkdown = File.Extension == ".md";
+                    bool isSvg = File.Extension == ".svg";
 
                     bool supportedByMonaco = MonacoHelper.SupportedMonacoFileTypes.Contains(File.Extension);
-                    bool useMonaco = supportedByMonaco && !isHtml && !isMarkdown;
+                    bool useMonaco = supportedByMonaco && !isHtml && !isMarkdown && !isSvg;
 
                     IsDevFilePreview = supportedByMonaco;
                     CustomContextMenu = useMonaco;
@@ -128,6 +133,13 @@ namespace Peek.FilePreviewer.Previewers
                         var raw = await ReadHelper.Read(File.Path.ToString());
                         Preview = new Uri(MarkdownHelper.PreviewTempFile(raw, File.Path, TempFolderPath.Path));
                     }
+                    else if (isSvg)
+                    {
+                        // SVG files are rendered directly by WebView2 for better compatibility
+                        // with complex SVGs from Adobe Illustrator, Inkscape, etc.
+                        IsDevFilePreview = false;
+                        Preview = new Uri(File.Path);
+                    }
                     else
                     {
                         // Simple html file to preview. Shouldn't do things like enabling scripts or using a virtual mapped directory.