chore(FE-Cleanup): Clean up unused code and add memoization

src/components/pages/expense/ExpenseRequestContent.tsx

@@ -1,9 +1,8 @@
 'use client';
 
-import { useEffect, useState } from 'react';
+import { useState } from 'react';
 import { useRouter } from 'next/navigation';
 import { useFormik } from 'formik';
-import useSWR from 'swr';
 import toast from 'react-hot-toast';
 
 import { Icon } from '@iconify/react';
@@ -57,10 +56,6 @@ const ExpenseRequestContent = ({
   const isLatestApprovalRejected =
     initialValues?.latest_approval.action === 'REJECTED';
 
-  const isLatestApprovalRejectedOrDone =
-    isLatestApprovalRejected ||
-    initialValues?.latest_approval.step_number === 6;
-
   const isCurrentApprovalOnHeadArea =
     !isLatestApprovalRejected &&
     initialValues?.latest_approval.step_number === 1;