feat(ui/quiz): implement real-time global chapter quiz generation, submit results to database, and display dynamic statistics on dashboard

src/NexusReader.Application/Queries/User/GetUserProfileQueryHandler.cs

@@ -23,6 +23,7 @@ public class GetUserProfileQueryHandler : IRequestHandler<GetUserProfileQuery, R
             .Select(u => new UserProfileDto
             {
                 Email = u.Email ?? string.Empty,
+                UserId = u.Id,
                 AITokensUsed = u.AITokensUsed,
                 TenantId = u.TenantId != null && u.TenantId.Length == 36 ? new Guid(u.TenantId) : Guid.Empty,
                 Plan = u.SubscriptionPlan != null ? new SubscriptionPlanDto
@@ -35,6 +36,9 @@ public class GetUserProfileQueryHandler : IRequestHandler<GetUserProfileQuery, R
                 AverageQuizScore = u.QuizResults.Any(q => q.TotalQuestions > 0) 
                     ? (int)u.QuizResults.Where(q => q.TotalQuestions > 0).Average(q => (double)q.Score / q.TotalQuestions * 100) 
                     : 0,
+                DisplayName = u.DisplayName,
+                BooksReadCount = u.Ebooks.Count(),
+                ConceptsMappedCount = dbContext.KnowledgeUnits.Count(k => k.TenantId == u.TenantId),
                 LastReadBook = u.Ebooks.OrderByDescending(e => e.LastReadDate).Select(e => new LastReadBookDto
                 {
                     Id = e.Id,
@@ -51,6 +55,15 @@ public class GetUserProfileQueryHandler : IRequestHandler<GetUserProfileQuery, R
                     Description = e.Description,
                     IsReadyForReading = e.IsReadyForReading
                 }).FirstOrDefault(),
+                RecentQuizzes = u.QuizResults.OrderByDescending(q => q.CompletedDate).Take(5).Select(q => new QuizResultDto
+                {
+                    Id = q.Id,
+                    Topic = q.Topic,
+                    Score = q.Score,
+                    TotalQuestions = q.TotalQuestions,
+                    Percentage = q.Percentage,
+                    CompletedDate = q.CompletedDate
+                }).ToList(),
                 Roles = dbContext.UserRoles
                     .Where(ur => ur.UserId == u.Id)
                     .Join(dbContext.Roles, ur => ur.RoleId, r => r.Id, (ur, r) => r.Name!)