Refactor QuickFiler coverage seams for issue 236 - #237

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-dotnet@v4, actions/upload-artifact@v4, microsoft/setup-msbuild@v2, nuget/setup-nuget@v2. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'AsyncEnumerable.ForEachAsync<TSource>(IAsyncEnumerable<TSource>, Action<TSource>, CancellationToken)' is obsolete: 'Use the language support for async foreach instead.'

'AsyncEnumerable.ForEachAwaitAsync<TSource>(IAsyncEnumerable<TSource>, Func<TSource, Task>, CancellationToken)' is obsolete: 'Use the language support for async foreach instead.'

'AsyncEnumerable.ForEachAwaitWithCancellationAsync<TSource>(IAsyncEnumerable<TSource>, Func<TSource, CancellationToken, Task>, CancellationToken)' is obsolete: 'Use the language support for async foreach instead.'

'AsyncEnumerable.SelectAwaitWithCancellation<TSource, TResult>(IAsyncEnumerable<TSource>, Func<TSource, CancellationToken, ValueTask<TResult>>)' is obsolete: 'Use Select. IAsyncEnumerable LINQ is now in System.Linq.AsyncEnumerable, and the SelectAwaitWithCancellation functionality now exists as overloads of Select.'

'AsyncEnumerable.ForEachAwaitWithCancellationAsync<TSource>(IAsyncEnumerable<TSource>, Func<TSource, CancellationToken, Task>, CancellationToken)' is obsolete: 'Use the language support for async foreach instead.'

'AsyncEnumerable.ForEachAwaitWithCancellationAsync<TSource>(IAsyncEnumerable<TSource>, Func<TSource, CancellationToken, Task>, CancellationToken)' is obsolete: 'Use the language support for async foreach instead.'

'AsyncEnumerable.ForEachAwaitAsync<TSource>(IAsyncEnumerable<TSource>, Func<TSource, Task>, CancellationToken)' is obsolete: 'Use the language support for async foreach instead.'

'AsyncEnumerable.SelectAwait<TSource, TResult>(IAsyncEnumerable<TSource>, Func<TSource, ValueTask<TResult>>)' is obsolete: 'Use Select. IAsyncEnumerable LINQ is now in System.Linq.AsyncEnumerable, and the SelectAwait functionality now exists as overloads of Select. You will need to modify your callback to take an additional CancellationToken argument.'

Field 'SvgImageSelector._relativeImagePath' is never assigned to, and will always have its default value null