Refactor: Change icon colors

Change icon colors to neuro-income, except for the logout icon which remains red.

src/pages/Settings.tsx

@@ -9,7 +9,7 @@ const SettingsOption = ({
   label, 
   description, 
   onClick,
-  color = "text-gray-700"
+  color = "text-neuro-income"
 }: { 
   icon: React.ElementType; 
   label: string; 
@@ -60,19 +60,16 @@ const Settings = () => {
             icon={User} 
             label="프로필 관리" 
             description="개인정보 및 프로필 설정"
-            color="text-neuro-income"
           />
           <SettingsOption 
             icon={CreditCard} 
             label="결제 방법" 
             description="카드 및 은행 계좌 관리"
-            color="text-blue-500"
           />
           <SettingsOption 
             icon={Bell} 
             label="알림 설정" 
             description="앱 알림 및 리마인더"
-            color="text-yellow-500"
           />
         </div>
         
@@ -82,13 +79,11 @@ const Settings = () => {
             icon={Lock} 
             label="보안 및 개인정보" 
             description="보안 및 데이터 설정"
-            color="text-green-500"
           />
           <SettingsOption 
             icon={HelpCircle} 
             label="도움말 및 지원" 
             description="FAQ 및 고객 지원"
-            color="text-purple-500"
           />
         </div>