Change budget bar color

Change the color of the "이번 달 총 예산" budget bar from purple to neuro-income.

src/components/BudgetCard.tsx

@@ -13,7 +13,7 @@ const BudgetCard: React.FC<BudgetCardProps> = ({
   title, 
   current, 
   total,
-  color = 'neuro-accent'
+  color = 'neuro-income'
 }) => {
   const percentage = Math.min(Math.round((current / total) * 100), 100);