feat: add validation to prevent users from starting multiple sections in progress

ProgramManager/src/Application/GozareshgirProgramManager.Application/Modules/Projects/Commands/ChangeStatusSection/ChangeStatusSectionCommandHandler.cs

@@ -52,7 +52,10 @@ public class ChangeStatusSectionCommandHandler : IBaseCommandHandler<ChangeStatu
 			// Going TO InProgress: Check if section has remaining time, then start work
 			if (!section.HasRemainingTime())
 				return OperationResult.ValidationError("زمان این بخش به پایان رسیده است");
-
+            if (await _taskSectionRepository.HasUserAnyInProgressSectionAsync(section.CurrentAssignedUserId, cancellationToken))
+            {
+                return OperationResult.ValidationError("کاربر مورد نظر در حال حاضر بخش دیگری را در وضعیت 'درحال انجام' دارد");
+            }
 			section.StartWork();
         }
         else

ProgramManager/src/Application/GozareshgirProgramManager.Application/Modules/Projects/Queries/ProjectSetTimeDetails/ProjectSetTimeDetailsQueryValidator.cs

@@ -1,4 +1,4 @@
-using FluentValidation;
+using FluentValidation;
 using GozareshgirProgramManager.Domain.ProjectAgg.Enums;
 
 namespace GozareshgirProgramManager.Application.Modules.Projects.Queries.ProjectSetTimeDetails;