feat: 모바일 멤버 페이지 카드 애니메이션 추가

- 페이드인 + 슬라이드업 애니메이션 적용
- 순차적 딜레이로 자연스러운 등장 효과

frontend/src/pages/mobile/public/Members.jsx

@@ -19,11 +19,14 @@ function MobileMembers() {
     }, []);
 
     // 멤버 카드 렌더링 함수
-    const renderMemberCard = (member, isFormer = false) => (
+    const renderMemberCard = (member, index, isFormer = false) => (
         <motion.div
             key={member.id}
             onClick={() => setSelectedMember(member)}
             className="text-center cursor-pointer"
+            initial={{ opacity: 0, y: 20 }}
+            animate={{ opacity: 1, y: 0 }}
+            transition={{ delay: index * 0.05, duration: 0.3 }}
             whileTap={{ scale: 0.95 }}
         >
             <div className={`aspect-square rounded-2xl overflow-hidden bg-gray-200 mb-2 shadow-sm ${isFormer ? 'grayscale' : ''}`}>
@@ -44,7 +47,7 @@ function MobileMembers() {
         <div className="px-4 py-4">
             {/* 현재 멤버 */}
             <div className="grid grid-cols-3 gap-3">
-                {members.map((member) => renderMemberCard(member))}
+                {members.map((member, index) => renderMemberCard(member, index))}
             </div>
 
             {/* 전 멤버 */}
@@ -54,7 +57,7 @@ function MobileMembers() {
                         <h2 className="text-lg font-bold text-gray-400">전 멤버</h2>
                     </div>
                     <div className="grid grid-cols-3 gap-3">
-                        {formerMembers.map((member) => renderMemberCard(member, true))}
+                        {formerMembers.map((member, index) => renderMemberCard(member, index, true))}
                     </div>
                 </>
             )}