refactor: 모바일 UI 개선

- 멤버 페이지: 바텀시트를 가운데 다이얼로그로 변경, 닫기 버튼 추가
- 앨범 상세: 섹션별 순차 애니메이션, 앨범 소개 다이얼로그로 변경
- 앨범 갤러리: 헤더 뒤로가기 버튼/클릭 기능 제거

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/pages/mobile/album/AlbumDetail.jsx

@@ -1,4 +1,4 @@
-import { useState, useEffect, useCallback } from 'react';
+import { useState, useEffect, useCallback, useRef } from 'react';
 import { useParams, useNavigate } from 'react-router-dom';
 import { useQuery } from '@tanstack/react-query';
 import { motion, AnimatePresence } from 'framer-motion';
@@ -26,6 +26,7 @@ function MobileAlbumDetail() {
   const [lightbox, setLightbox] = useState({ open: false, images: [], index: 0, teasers: null, photos: null });
   const [showAllTracks, setShowAllTracks] = useState(false);
   const [showDescriptionModal, setShowDescriptionModal] = useState(false);
+  const descriptionHistoryRef = useRef(false);
 
   // 앨범 데이터 로드
   const { data: album, isLoading: loading } = useQuery({
@@ -50,12 +51,23 @@ function MobileAlbumDetail() {
   const openDescriptionModal = useCallback(() => {
     setShowDescriptionModal(true);
     window.history.pushState({ description: true }, '');
+    descriptionHistoryRef.current = true;
+  }, []);
+
+  // 앨범 소개 닫기
+  const closeDescriptionModal = useCallback(() => {
+    setShowDescriptionModal(false);
+    if (descriptionHistoryRef.current) {
+      descriptionHistoryRef.current = false;
+      window.history.back();
+    }
   }, []);
 
   // 뒤로가기 처리 (앨범 소개만 - 라이트박스는 MobileLightbox에서 처리)
   useEffect(() => {
     const handlePopState = () => {
       if (showDescriptionModal) {
+        descriptionHistoryRef.current = false;
         setShowDescriptionModal(false);
       }
     };
@@ -184,7 +196,12 @@ function MobileAlbumDetail() {
 
         {/* 티저 이미지 */}
         {album.teasers && album.teasers.length > 0 && (
-          <motion.div initial={{ opacity: 0 }} animate={{ opacity: 1 }} className="px-4 py-4 border-b border-gray-100">
+          <motion.div
+            initial={{ opacity: 0, y: 20 }}
+            animate={{ opacity: 1, y: 0 }}
+            transition={{ delay: 0.15 }}
+            className="px-4 py-4 border-b border-gray-100"
+          >
             <p className="text-sm font-semibold mb-3">티저 이미지</p>
             <div className="flex gap-3 overflow-x-auto pb-1 -mx-4 px-4 scrollbar-hide">
               {album.teasers.map((teaser, index) => (
@@ -222,6 +239,7 @@ function MobileAlbumDetail() {
           <motion.div
             initial={{ opacity: 0, y: 20 }}
             animate={{ opacity: 1, y: 0 }}
+            transition={{ delay: 0.2 }}
             className="px-4 py-4 border-b border-gray-100"
           >
             <p className="text-sm font-semibold mb-3">수록곡</p>
@@ -269,7 +287,7 @@ function MobileAlbumDetail() {
           <motion.div
             initial={{ opacity: 0, y: 20 }}
             animate={{ opacity: 1, y: 0 }}
-            transition={{ delay: 0.1 }}
+            transition={{ delay: 0.25 }}
             className="px-4 py-4"
           >
             <p className="text-sm font-semibold mb-3">컨셉 포토</p>
@@ -314,38 +332,26 @@ function MobileAlbumDetail() {
             initial={{ opacity: 0 }}
             animate={{ opacity: 1 }}
             exit={{ opacity: 0 }}
-            className="fixed inset-0 bg-black/60 z-[60] flex items-end justify-center"
-            onClick={() => window.history.back()}
+            className="fixed inset-0 bg-black/60 z-[60] flex items-center justify-center p-6"
+            onClick={closeDescriptionModal}
           >
             <motion.div
-              initial={{ y: '100%' }}
-              animate={{ y: 0 }}
-              exit={{ y: '100%' }}
+              initial={{ opacity: 0, scale: 0.95 }}
+              animate={{ opacity: 1, scale: 1 }}
+              exit={{ opacity: 0, scale: 0.95 }}
               transition={{ type: 'spring', damping: 25, stiffness: 300 }}
-              drag="y"
-              dragConstraints={{ top: 0, bottom: 0 }}
-              dragElastic={{ top: 0, bottom: 0.5 }}
-              onDragEnd={(_, info) => {
-                if (info.offset.y > 100 || info.velocity.y > 300) {
-                  window.history.back();
-                }
-              }}
-              className="bg-white rounded-t-3xl w-full max-h-[80vh] overflow-hidden"
+              className="bg-white rounded-2xl w-full max-h-[70vh] overflow-hidden"
               onClick={(e) => e.stopPropagation()}
             >
-              {/* 드래그 핸들 */}
-              <div className="flex justify-center pt-3 pb-2 cursor-grab active:cursor-grabbing">
-                <div className="w-10 h-1 bg-gray-300 rounded-full" />
-              </div>
               {/* 헤더 */}
-              <div className="flex items-center justify-between px-5 pb-3 border-b border-gray-100">
+              <div className="flex items-center justify-between px-5 py-4 border-b border-gray-100">
                 <h3 className="text-lg font-bold">앨범 소개</h3>
-                <button onClick={() => window.history.back()} className="p-1.5">
+                <button onClick={closeDescriptionModal} className="p-1.5">
                   <X size={20} className="text-gray-500" />
                 </button>
               </div>
               {/* 내용 */}
-              <div className="px-5 py-4 overflow-y-auto max-h-[60vh]">
+              <div className="px-5 py-4 overflow-y-auto max-h-[55vh]">
                 <p className="text-sm text-gray-600 leading-relaxed whitespace-pre-line text-justify">{album.description}</p>
               </div>
             </motion.div>

frontend/src/pages/mobile/album/AlbumGallery.jsx

@@ -1,7 +1,6 @@
 import { useState, useCallback, useMemo } from 'react';
-import { useParams, useNavigate } from 'react-router-dom';
+import { useParams } from 'react-router-dom';
 import { useQuery } from '@tanstack/react-query';
-import { ChevronRight } from 'lucide-react';
 import { motion } from 'framer-motion';
 import { getAlbumByName } from '@/api';
 import { MobileLightbox } from '@/components/common';
@@ -11,7 +10,6 @@ import { MobileLightbox } from '@/components/common';
  */
 function MobileAlbumGallery() {
   const { name } = useParams();
-  const navigate = useNavigate();
   const [selectedIndex, setSelectedIndex] = useState(null);
 
   // 앨범 데이터 로드
@@ -78,10 +76,7 @@ function MobileAlbumGallery() {
     <>
       <div className="pb-4">
         {/* 앨범 헤더 카드 */}
-        <div
-          className="mx-4 mt-4 mb-4 p-4 bg-gradient-to-r from-primary/5 to-primary/10 rounded-2xl flex items-center gap-4"
-          onClick={() => navigate(-1)}
-        >
+        <div className="mx-4 mt-4 mb-4 p-4 bg-gradient-to-r from-primary/5 to-primary/10 rounded-2xl flex items-center gap-4">
           {album?.cover_thumb_url && (
             <img
               src={album.cover_thumb_url}
@@ -94,7 +89,6 @@ function MobileAlbumGallery() {
             <p className="font-bold truncate">{album?.title}</p>
             <p className="text-xs text-gray-500">{photos.length}장의 사진</p>
           </div>
-          <ChevronRight size={20} className="text-gray-400 rotate-180" />
         </div>
 
         {/* 2열 그리드 */}

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

@@ -1,6 +1,6 @@
 import { motion, AnimatePresence } from 'framer-motion';
 import { useState, useMemo, useRef, useEffect } from 'react';
-import { Instagram, Calendar } from 'lucide-react';
+import { Calendar, X, Instagram } from 'lucide-react';
 import { useMembers } from '@/hooks';
 
 /**
@@ -39,7 +39,6 @@ const MemberCard = ({ member, index, onClick, shouldAnimate }) => (
  */
 function MobileMembers() {
   const [selectedMember, setSelectedMember] = useState(null);
-  const [isDragging, setIsDragging] = useState(false);
   const hasAnimated = useRef(false);
 
   // 멤버 데이터 로드
@@ -81,13 +80,6 @@ function MobileMembers() {
     return age;
   };
 
-  // 드래그 종료 시 닫기 판단
-  const handleDragEnd = (_, info) => {
-    if (info.offset.y > 100 || info.velocity.y > 500) {
-      setSelectedMember(null);
-    }
-  };
-
   if (allMembers.length === 0) {
     return (
       <div className="flex items-center justify-center h-[calc(100vh-200px)]">
@@ -101,7 +93,7 @@ function MobileMembers() {
   return (
     <div className="bg-gray-50 p-4">
       {/* 현재 멤버 */}
-      <div className="grid grid-cols-2 gap-3">
+      <div className="grid grid-cols-2 gap-4">
         {currentMembers.map((member, index) => (
           <MemberCard
             key={member.id}
@@ -121,7 +113,7 @@ function MobileMembers() {
             <span className="text-gray-400 text-sm font-medium">전 멤버</span>
             <div className="flex-1 h-px bg-gray-300" />
           </div>
-          <div className="grid grid-cols-2 gap-3">
+          <div className="grid grid-cols-2 gap-4">
             {formerMembers.map((member, index) => (
               <MemberCard
                 key={member.id}
@@ -143,79 +135,66 @@ function MobileMembers() {
             animate={{ opacity: 1 }}
             exit={{ opacity: 0 }}
             transition={{ duration: 0.2 }}
-            className="fixed inset-0 z-[100] bg-black/60 flex items-end"
+            className="fixed inset-0 z-[100] bg-black/60 flex items-center justify-center p-8"
             onClick={() => setSelectedMember(null)}
           >
             <motion.div
-              initial={{ y: '100%' }}
-              animate={{ y: 20 }}
-              exit={{ y: '100%' }}
-              transition={{ type: 'spring', damping: 28, stiffness: 350 }}
-              drag="y"
-              dragConstraints={{ top: 20, bottom: 20 }}
-              dragElastic={{ top: 0, bottom: 0.6 }}
-              onDragStart={() => setIsDragging(true)}
-              onDragEnd={(e, info) => {
-                setIsDragging(false);
-                handleDragEnd(e, info);
-              }}
-              className="relative w-full bg-white rounded-t-3xl touch-none pb-10"
+              initial={{ opacity: 0, scale: 0.95 }}
+              animate={{ opacity: 1, scale: 1 }}
+              exit={{ opacity: 0, scale: 0.95 }}
+              transition={{ type: 'spring', damping: 25, stiffness: 300 }}
+              className="w-64 bg-white rounded-2xl overflow-hidden"
               onClick={(e) => e.stopPropagation()}
             >
-              {/* 드래그 핸들 */}
-              <div className="flex justify-center pt-3 pb-2 cursor-grab active:cursor-grabbing">
-                <div className="w-10 h-1 bg-gray-300 rounded-full" />
+              {/* 이미지 */}
+              <div className="relative aspect-[3/4] overflow-hidden">
+                {selectedMember.image_thumb || selectedMember.image_url ? (
+                  <img
+                    src={selectedMember.image_thumb || selectedMember.image_url}
+                    alt={selectedMember.name}
+                    className="w-full h-full object-cover"
+                  />
+                ) : (
+                  <div className="w-full h-full bg-gray-200 flex items-center justify-center text-3xl font-bold text-gray-400">
+                    {selectedMember.name[0]}
+                  </div>
+                )}
+                {/* 닫기 버튼 */}
+                <button
+                  onClick={() => setSelectedMember(null)}
+                  className="absolute top-2 right-2 w-8 h-8 bg-black/50 rounded-full flex items-center justify-center"
+                >
+                  <X size={18} className="text-white" />
+                </button>
               </div>
 
-              <div className="px-5">
-                <div className="flex gap-4">
-                  {/* 이미지 */}
-                  <div className="w-24 h-32 rounded-xl overflow-hidden flex-shrink-0">
-                    {selectedMember.image_thumb || selectedMember.image_url ? (
-                      <img
-                        src={selectedMember.image_thumb || selectedMember.image_url}
-                        alt={selectedMember.name}
-                        className="w-full h-full object-cover"
-                      />
-                    ) : (
-                      <div className="w-full h-full bg-gray-200 flex items-center justify-center text-2xl font-bold text-gray-400">
-                        {selectedMember.name[0]}
-                      </div>
+              {/* 정보 영역 */}
+              <div className="p-4 text-center">
+                <h3 className="text-lg font-bold">{selectedMember.name}</h3>
+                {selectedMember.birth_date && (
+                  <div className="flex items-center justify-center gap-1 text-gray-500 text-sm mt-1.5">
+                    <Calendar size={14} />
+                    <span>
+                      {selectedMember.birth_date?.slice(0, 10).replaceAll('-', '.')}
+                    </span>
+                    {calculateAge(selectedMember.birth_date) && (
+                      <span className="ml-0.5 text-primary">
+                        ({calculateAge(selectedMember.birth_date)}세)
+                      </span>
                     )}
                   </div>
-
-                  {/* 정보 영역 */}
-                  <div className="flex-1 flex flex-col justify-between py-1">
-                    <div>
-                      <h3 className="text-xl font-bold">{selectedMember.name}</h3>
-                      {selectedMember.birth_date && (
-                        <div className="flex items-center gap-1 text-gray-500 text-sm mt-2">
-                          <Calendar size={14} />
-                          <span>
-                            {selectedMember.birth_date?.slice(0, 10).replaceAll('-', '.')}
-                          </span>
-                          {calculateAge(selectedMember.birth_date) && (
-                            <span className="ml-1 text-primary">
-                              ({calculateAge(selectedMember.birth_date)}세)
-                            </span>
-                          )}
-                        </div>
-                      )}
-                    </div>
-                    {!selectedMember.is_former && selectedMember.instagram && (
-                      <a
-                        href={selectedMember.instagram}
-                        target="_blank"
-                        rel="noopener noreferrer"
-                        onClick={(e) => isDragging && e.preventDefault()}
-                        className="inline-flex items-center gap-1.5 self-start px-4 py-2 bg-gradient-to-r from-[#833AB4] via-[#E1306C] to-[#F77737] rounded-full"
-                      >
-                        <Instagram size={14} className="text-white" />
-                        <span className="text-white text-xs font-medium">Instagram</span>
-                      </a>
-                    )}
-                  </div>
-                </div>
+                )}
+                {!selectedMember.is_former && selectedMember.instagram && (
+                  <a
+                    href={selectedMember.instagram}
+                    target="_blank"
+                    rel="noopener noreferrer"
+                    className="inline-flex items-center justify-center gap-1.5 mt-3 w-full py-2.5 bg-gradient-to-r from-[#833AB4] via-[#E1306C] to-[#F77737] rounded-xl"
+                  >
+                    <Instagram size={16} className="text-white" />
+                    <span className="text-white text-sm font-medium">Instagram</span>
+                  </a>
+                )}
               </div>
             </motion.div>
           </motion.div>