Minor fixes and formatting updates in payroll, enums, and menus

<SRS> SRS02 : Employee Management </SRS>

<Changes>
- Fixed variable naming issue in Payroll deserialization
- Added braces for consistency in enum string-to-value helpers
- Improved readability in validation logic
- Corrected typo in Finance Executive payroll menu text
</Changes>

<Review>
Smitha Mohan
</Review>

Trenser.Zenvy/Trenser.Zenvy/views/FinanceExecutiveMenu.cpp

@@ -43,7 +43,7 @@ void FinanceExecutiveMenu::updatePayroll()
 		util::read(foodAllowance);
 		std::cout << "Enter the New EmployeePFContribution: ";
 		util::read(employeePFContribution);
-		std::cout << "Enter the New EmplyerPFContribution: ";
+		std::cout << "Enter the New EmployerPFContribution: ";
 		util::read(employerPFContribution);
 		m_zenvyController->updateSalary(employeeId, basicSalary, houseRentAllowance, foodAllowance, employeePFContribution, employerPFContribution);
 		std::cout << "Payroll Updated";