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

src/NexusReader.Application/Mappings/MappingConfig.cs

@@ -1,13 +1,14 @@
 using Mapster;
-using NexusReader.Application.DTOs.User;
-using NexusReader.Domain.Entities;
+using MapsterMapper;
 using Microsoft.Extensions.DependencyInjection;
+using NexusReader.Domain.Entities;
+using NexusReader.Application.DTOs.User;
 
 namespace NexusReader.Application.Mappings;
 
 public static class MappingConfig
 {
-    public static void RegisterMappings(this IServiceCollection services)
+    public static IServiceCollection AddMapsterConfiguration(this IServiceCollection services)
     {
         var config = TypeAdapterConfig.GlobalSettings;
         
@@ -16,5 +17,7 @@ public static class MappingConfig
 
         services.AddSingleton(config);
         services.AddScoped<IMapper, ServiceMapper>();
+
+        return services;
     }
 }