Adjust progress bar color

Make the color of the progress bar above the total budget slightly darker.

src/components/BudgetTabContent.tsx

@@ -121,7 +121,7 @@ const BudgetTabContent: React.FC<BudgetTabContentProps> = ({
               <p className="text-sm text-gray-500 mb-4">카테고리 예산을 설정하면 일일, 주간, 월간 예산이 자동으로 합산됩니다.</p>
               <CategoryBudgetInputs categoryBudgets={categoryBudgets} handleCategoryInputChange={handleCategoryInputChange} />
               
-              <div className="mt-4 border-t pt-3">
+              <div className="mt-4 border-t border-gray-300 pt-3">
                 <div className="flex justify-between items-center mb-4">
                   <h3 className="font-medium text-sm px-[34px]">전체 예산:</h3>
                   <p className="font-bold text-neuro-income text-base px-[10px]">{formatCurrency(calculateTotalBudget())}</p>