FSD 아키텍처로 프로젝트 구조 리팩토링

주요 변경사항:
- FSD(Feature-Sliced Design) 아키텍처 도입
- shared 레이어 구조 생성 (ui, lib, api, model, types, config)
- 공통 UI 컴포넌트를 shared/ui로 이동 (Header, BottomNavigation, Loading, Toast)
- 라이브러리 코드를 shared/lib로 이동 (theme-provider, react-query-provider, theme)
- 모든 import 경로 업데이트하여 새로운 구조 반영
- 기존 components, lib 디렉토리 제거
- 빌드 검증 완료

향후 확장:
- widgets: 복잡한 UI 블록
- features: 기능 단위 코드
- entities: 비즈니스 엔티티

🤖 Generated with Claude Code

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

src/shared/ui/BottomNavigation.tsx

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+'use client';
+
+import { usePathname, useRouter } from 'next/navigation';
+import { BottomNavigation as MuiBottomNavigation, BottomNavigationAction, Paper } from '@mui/material';
+import { Home, Celebration, Analytics, Person } from '@mui/icons-material';
+
+export default function BottomNavigation() {
+  const pathname = usePathname();
+  const router = useRouter();
+
+  // Determine current value based on pathname
+  const getCurrentValue = () => {
+    if (pathname === '/' || pathname === '/dashboard') return 'home';
+    if (pathname.startsWith('/events')) return 'events';
+    if (pathname.startsWith('/analytics')) return 'analytics';
+    if (pathname.startsWith('/profile')) return 'profile';
+    return 'home';
+  };
+
+  const value = getCurrentValue();
+
+  const handleChange = (_event: React.SyntheticEvent, newValue: string) => {
+    switch (newValue) {
+      case 'home':
+        router.push('/');
+        break;
+      case 'events':
+        router.push('/events');
+        break;
+      case 'analytics':
+        router.push('/analytics');
+        break;
+      case 'profile':
+        router.push('/profile');
+        break;
+    }
+  };
+
+  return (
+    <Paper
+      sx={{
+        position: 'fixed',
+        bottom: 0,
+        left: 0,
+        right: 0,
+        zIndex: (theme) => theme.zIndex.drawer + 1,
+        borderTop: '1px solid',
+        borderColor: 'divider',
+      }}
+      elevation={3}
+    >
+      <MuiBottomNavigation
+        value={value}
+        onChange={handleChange}
+        showLabels
+        sx={{
+          height: { xs: 56, sm: 64 },
+          '& .MuiBottomNavigationAction-root': {
+            minWidth: 'auto',
+            px: 1,
+          },
+          '& .MuiBottomNavigationAction-label': {
+            fontSize: { xs: '0.7rem', sm: '0.75rem' },
+            fontWeight: 600,
+            mt: 0.5,
+          },
+          '& .MuiBottomNavigationAction-root.Mui-selected': {
+            color: 'primary.main',
+          },
+        }}
+      >
+        <BottomNavigationAction
+          label="홈"
+          value="home"
+          icon={<Home />}
+          sx={{
+            '& .MuiSvgIcon-root': {
+              fontSize: { xs: 24, sm: 28 },
+            },
+          }}
+        />
+        <BottomNavigationAction
+          label="이벤트"
+          value="events"
+          icon={<Celebration />}
+          sx={{
+            '& .MuiSvgIcon-root': {
+              fontSize: { xs: 24, sm: 28 },
+            },
+          }}
+        />
+        <BottomNavigationAction
+          label="분석"
+          value="analytics"
+          icon={<Analytics />}
+          sx={{
+            '& .MuiSvgIcon-root': {
+              fontSize: { xs: 24, sm: 28 },
+            },
+          }}
+        />
+        <BottomNavigationAction
+          label="프로필"
+          value="profile"
+          icon={<Person />}
+          sx={{
+            '& .MuiSvgIcon-root': {
+              fontSize: { xs: 24, sm: 28 },
+            },
+          }}
+        />
+      </MuiBottomNavigation>
+    </Paper>
+  );
+}

src/shared/ui/Header.tsx

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+'use client';
+
+import { useRouter } from 'next/navigation';
+import { AppBar, Toolbar, IconButton, Typography, Box } from '@mui/material';
+import { ArrowBack, Menu, AccountCircle } from '@mui/icons-material';
+
+interface HeaderProps {
+  title?: string;
+  showBack?: boolean;
+  showMenu?: boolean;
+  showProfile?: boolean;
+  onBackClick?: () => void;
+  onMenuClick?: () => void;
+  onProfileClick?: () => void;
+}
+
+export default function Header({
+  title = '',
+  showBack = true,
+  showMenu = false,
+  showProfile = true,
+  onBackClick,
+  onMenuClick,
+  onProfileClick,
+}: HeaderProps) {
+  const router = useRouter();
+
+  const handleBackClick = () => {
+    if (onBackClick) {
+      onBackClick();
+    } else {
+      router.back();
+    }
+  };
+
+  const handleProfileClick = () => {
+    if (onProfileClick) {
+      onProfileClick();
+    } else {
+      router.push('/profile');
+    }
+  };
+
+  return (
+    <AppBar
+      position="fixed"
+      elevation={0}
+      sx={{
+        bgcolor: 'background.paper',
+        borderBottom: '1px solid',
+        borderColor: 'divider',
+        zIndex: (theme) => theme.zIndex.drawer + 1,
+      }}
+    >
+      <Toolbar
+        sx={{
+          minHeight: { xs: 56, sm: 64 },
+          px: { xs: 2, sm: 3 },
+        }}
+      >
+        {/* Left Section */}
+        <Box sx={{ display: 'flex', alignItems: 'center', flex: 1 }}>
+          {showMenu && (
+            <IconButton
+              edge="start"
+              color="inherit"
+              aria-label="메뉴"
+              onClick={onMenuClick}
+              sx={{ mr: 1, color: 'text.primary' }}
+            >
+              <Menu />
+            </IconButton>
+          )}
+          {showBack && (
+            <IconButton
+              edge="start"
+              color="inherit"
+              aria-label="뒤로가기"
+              onClick={handleBackClick}
+              sx={{ mr: 1, color: 'text.primary' }}
+            >
+              <ArrowBack />
+            </IconButton>
+          )}
+          {title && (
+            <Typography
+              variant="h6"
+              sx={{
+                fontWeight: 700,
+                color: 'text.primary',
+                fontSize: { xs: '1.1rem', sm: '1.25rem' },
+              }}
+            >
+              {title}
+            </Typography>
+          )}
+        </Box>
+
+        {/* Right Section */}
+        {showProfile && (
+          <IconButton
+            edge="end"
+            color="inherit"
+            aria-label="프로필"
+            onClick={handleProfileClick}
+            sx={{ color: 'text.primary' }}
+          >
+            <AccountCircle />
+          </IconButton>
+        )}
+      </Toolbar>
+    </AppBar>
+  );
+}

src/shared/ui/Loading.tsx

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+import { Box, CircularProgress, Typography } from '@mui/material';
+
+interface LoadingProps {
+  message?: string;
+  size?: number;
+}
+
+export function Loading({ message = '로딩 중...', size = 40 }: LoadingProps) {
+  return (
+    <Box
+      sx={{
+        display: 'flex',
+        flexDirection: 'column',
+        alignItems: 'center',
+        justifyContent: 'center',
+        minHeight: '200px',
+        gap: 2,
+      }}
+    >
+      <CircularProgress size={size} />
+      {message && (
+        <Typography variant="body2" color="text.secondary">
+          {message}
+        </Typography>
+      )}
+    </Box>
+  );
+}

src/shared/ui/Toast.tsx

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+'use client';
+
+import { Snackbar, Alert } from '@mui/material';
+import { useUIStore } from '@/stores/uiStore';
+
+export function Toast() {
+  const { toast, hideToast } = useUIStore();
+
+  return (
+    <Snackbar
+      open={toast.open}
+      autoHideDuration={3000}
+      onClose={hideToast}
+      anchorOrigin={{ vertical: 'bottom', horizontal: 'center' }}
+      sx={{ bottom: { xs: 80, sm: 24 } }}
+    >
+      <Alert
+        onClose={hideToast}
+        severity={toast.severity}
+        variant="filled"
+        sx={{ width: '100%' }}
+      >
+        {toast.message}
+      </Alert>
+    </Snackbar>
+  );
+}