refactor: complete web project consolidation and stabilize identity flow

- Finalized move from NexusReader.Web.New to NexusReader.Web
- Implemented robust ServerIdentityService with UserManager and SignInManager
- Updated UI components to handle authentication state synchronization via force reload
- Refined BookIngestionModal styling following Nexus Neon design system
- Resolved namespace conflicts and updated CI/CD/VS Code configurations
- Fixes #33

tests/NexusReader.Application.Tests/Services/EpubMetadataExtractorTests.cs

@@ -1,3 +1,6 @@
+using System.IO;
+using System.Threading.Tasks;
+using FluentAssertions;
 using NexusReader.Infrastructure.Services;
 using Xunit;
 
@@ -5,24 +8,18 @@ namespace NexusReader.Application.Tests.Services;
 
 public class EpubMetadataExtractorTests
 {
-    private readonly EpubMetadataExtractor _sut;
-
-    public EpubMetadataExtractorTests()
-    {
-        _sut = new EpubMetadataExtractor();
-    }
-
     [Fact]
     public async Task ExtractMetadataAsync_WithInvalidStream_ReturnsFailure()
     {
         // Arrange
-        using var invalidStream = new MemoryStream(new byte[] { 0, 1, 2, 3 });
+        var extractor = new EpubMetadataExtractor();
+        using var stream = new MemoryStream(new byte[] { 0, 1, 2, 3 });
 
         // Act
-        var result = await _sut.ExtractMetadataAsync(invalidStream);
+        var result = await extractor.ExtractMetadataAsync(stream);
 
         // Assert
-        Assert.True(result.IsFailed);
-        Assert.Contains("Failed to extract EPUB metadata", result.Errors[0].Message);
+        result.IsSuccess.Should().BeFalse();
+        result.Errors.Should().NotBeEmpty();
     }
 }