Change save button color

Change the color of the save button to the main color (green).

src/components/BudgetProgressCard.tsx

@@ -1,4 +1,3 @@
-
 import React, { useState } from 'react';
 import { Tabs, TabsContent, TabsList, TabsTrigger } from '@/components/ui/tabs';
 import { Input } from '@/components/ui/input';
@@ -192,7 +191,7 @@ const BudgetTabContent: React.FC<BudgetTabContentProps> = ({
             </div>
             
             <div className="flex justify-end">
-              <Button onClick={handleSave} size="sm" className="neuro-flat text-slate-50 bg-slate-400 hover:bg-slate-300">
+              <Button onClick={handleSave} size="sm" className="neuro-flat text-slate-50 bg-neuro-income hover:bg-neuro-income/90">
                 <Check size={16} className="mr-1" />
                 저장하기
               </Button>