학생/교사/관리자 대시보드를 하나의 공통 화면으로 통합

StudentDashboard, TeacherDashboard, AdminDashboard(진입 라우팅)를
MainDashboard 하나로 합치고, 역할(role)에 따라 배너 색상/문구와
보이는 타일만 달라지게 함. 그리드 레이아웃/카드 디자인은 이제
한 곳에서만 관리되어, 앞으로 UI를 고치면 모든 역할에 자동 적용됨.

- 2061(개발자) 계정에 기존에 빠져있던 "스마트기기 반출 대장" 타일 추가
- role=='admin' 실 계정도 이제 학생 계정 관리/출석 확인 등 교사 기능에
  접근 가능 (관리자는 교사 권한을 포함하는 것으로 정리)
- 작은 DB 초기화 전용 화면(admin_dashboard.dart)은 "서버 DB 제어"
  타일의 목적지로만 유지, 로그인 직후 랜딩 화면 역할은 제거

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

lib/ui/login_screen.dart

@@ -3,9 +3,7 @@
 import 'package:flutter/material.dart';
 import '../config.dart' show schoolName;
 import '../function/login_controller.dart';
-import 'student_dashboard.dart';
+import 'main_dashboard.dart';
-import 'teacher_dashboard.dart';
-import 'admin_dashboard.dart';
 import 'teacher_register_screen.dart';
 
 // -------------------------------------------------------------
@@ -50,9 +48,10 @@ class _LoginScreenState extends State<LoginScreen> {
         Navigator.pushReplacement(
           context,
           MaterialPageRoute(
-            builder: (context) => StudentDashboard(
+            builder: (context) => MainDashboard(
-              studentId: result.studentId!,
+              userId: result.studentId!,
-              studentName: result.name!,
+              userName: result.name!,
+              role: 'student',
               isDeviceMatched: true,
             ),
           ),
@@ -154,9 +153,9 @@ class _LoginScreenState extends State<LoginScreen> {
 
                           if (success) {
                             Navigator.pop(dialogContext);
-                            ScaffoldMessenger.of(context).showSnackBar(
+                            ScaffoldMessenger.of(
-                              SnackBar(content: Text(message)),
+                              context,
-                            );
+                            ).showSnackBar(SnackBar(content: Text(message)));
                             _navigateBasedOnRole(
                               role,
                               studentId,
@@ -164,9 +163,9 @@ class _LoginScreenState extends State<LoginScreen> {
                               isDeviceMatched,
                             );
                           } else {
-                            ScaffoldMessenger.of(context).showSnackBar(
+                            ScaffoldMessenger.of(
-                              SnackBar(content: Text(message)),
+                              context,
-                            );
+                            ).showSnackBar(SnackBar(content: Text(message)));
                           }
                         },
                         child: const Text('변경하고 시작하기'),
@@ -186,32 +185,18 @@ class _LoginScreenState extends State<LoginScreen> {
     String name,
     bool isDeviceMatched,
   ) {
-    if (role == 'teacher') {
     Navigator.pushReplacement(
       context,
       MaterialPageRoute(
-          builder: (context) =>
+        builder: (context) => MainDashboard(
-              TeacherDashboard(teacherId: studentId, teacherName: name),
+          userId: studentId,
-        ),
+          userName: name,
-      );
+          role: role,
-    } else if (role == 'admin') {
-      Navigator.pushReplacement(
-        context,
-        MaterialPageRoute(builder: (context) => const AdminDashboard()),
-      );
-    } else {
-      Navigator.pushReplacement(
-        context,
-        MaterialPageRoute(
-          builder: (context) => StudentDashboard(
-            studentId: studentId,
-            studentName: name,
           isDeviceMatched: isDeviceMatched,
         ),
       ),
     );
   }
-  }
 
   void _showErrorDialog(String message) {
     showDialog(
@@ -403,7 +388,7 @@ class _LoginScreenState extends State<LoginScreen> {
                           onPressed: () => _showLegacyPasswordDialog(
                             '선생님',
                             '1234',
-                            const TeacherDashboard(),
+                            const MainDashboard(role: 'teacher'),
                           ),
                         ),
                         TextButton.icon(
@@ -419,7 +404,7 @@ class _LoginScreenState extends State<LoginScreen> {
                           onPressed: () => _showLegacyPasswordDialog(
                             '시스템 관리자',
                             '4936',
-                            const AdminDashboard(),
+                            const MainDashboard(role: 'admin'),
                           ),
                         ),
                       ],

lib/ui/main_dashboard.dart

@@ -1,59 +1,68 @@
-// 🎓 학생 대시보드 (UI 전용). NFC 주머니 체크인 진입, 실시간 학교 상황 안내,
+// 🏠 통합 대시보드 (UI 전용). 학생/교사/관리자가 전부 이 화면 하나를 공유하고,
-// 개발자 마스터 계정 전용 관리 메뉴(현황/DB제어/계정관리/삭제) 카드를 그린다.
+// 권한(role)에 따라 배너 색상/문구와 보이는 타일만 달라진다.
-// 계정 삭제 서버 통신은 lib/function/student_dashboard_controller.dart가 담당한다.
+// 레이아웃(그리드, 카드 디자인)을 한 곳에서 고치면 모든 역할에 동시에 적용된다.
+// 계정 강제 삭제 서버 통신은 lib/function/student_dashboard_controller.dart가 담당한다.
 import 'package:flutter/material.dart';
 import '../function/student_dashboard_controller.dart';
-import 'device_checkout_request_screen.dart';
-import 'nfc_poccket_checkin_screen.dart';
-import 'login_screen.dart';
-import 'teacher_attendance_page.dart';
 import 'admin_dashboard.dart';
-import 'teacher_student_management_page.dart';
+import 'device_checkout_ledger_page.dart';
+import 'device_checkout_request_screen.dart';
+import 'login_screen.dart';
+import 'nfc_poccket_checkin_screen.dart';
 import 'nfc_tag_writer_screen.dart';
+import 'teacher_attendance_page.dart';
+import 'teacher_student_management_page.dart';
 
-// -------------------------------------------------------------
+class MainDashboard extends StatefulWidget {
-// 2. 학생 대시보드 (StudentDashboard)
+  final String? userId;
-// -------------------------------------------------------------
+  final String? userName;
+  final String role; // 'student' | 'teacher' | 'admin'
+  final bool isDeviceMatched;
 
-class StudentDashboard extends StatefulWidget {
+  const MainDashboard({
-  final String studentId;
-  final String studentName;
-  final bool isDeviceMatched; // 🆕 [변경] 기기 UUID가 매칭되었는지 확인하는 변수 추가
-
-  const StudentDashboard({
     super.key,
-    required this.studentId,
+    this.userId,
-    required this.studentName,
+    this.userName,
-    required this.isDeviceMatched, // 🆕 [변경] 필수 매개변수로 등록
+    required this.role,
+    this.isDeviceMatched = true,
   });
 
   @override
-  State<StudentDashboard> createState() => _StudentDashboardState();
+  State<MainDashboard> createState() => _MainDashboardState();
 }
 
-class _StudentDashboardState extends State<StudentDashboard> {
+class _MainDashboardState extends State<MainDashboard> {
   final StudentDashboardController _controller = StudentDashboardController();
 
+  // 🔑 [권한 판정] 2061은 role이 'student'로 저장돼 있지만 실질적으로 최고 권한을 가진다.
+  bool get _isDeveloper => widget.userId == '2061';
+  bool get _isAdmin => widget.role == 'admin' || _isDeveloper;
+  bool get _isTeacherOrAbove => widget.role == 'teacher' || _isAdmin;
+  bool get _isStudent => widget.role == 'student';
+
+  String get _displayId =>
+      widget.userId ?? (widget.role == 'admin' ? '관리자' : '간편인증');
+  String get _displayName =>
+      widget.userName ?? (widget.role == 'admin' ? '시스템 관리자' : '간편인증 선생');
+
   @override
   void dispose() {
     _controller.dispose();
     super.dispose();
   }
 
-  // 1️⃣ NFC 태그 카드 → 실제 NFC 주머니 체크인 화면으로 이동
   void _openPocketCheckIn(BuildContext context) {
     Navigator.push(
       context,
       MaterialPageRoute(
         builder: (context) => NfcPocketCheckInScreen(
-          studentId: widget.studentId,
+          studentId: _displayId,
-          studentName: widget.studentName,
+          studentName: _displayName,
         ),
       ),
     );
   }
 
-  // 2️⃣ [기존 동일] 마스터 계정 전용 회원 삭제 버튼 동작
   Future<void> _deleteUser(String userId) async {
     final (_, message) = await _controller.deleteUser(userId);
     if (!mounted) return;
@@ -62,7 +71,6 @@ class _StudentDashboardState extends State<StudentDashboard> {
     ).showSnackBar(SnackBar(content: Text(message)));
   }
 
-  // 3️⃣ [기존 동일] 학번/교직원 번호를 입력받는 모던 팝업창(Dialog)
   void _showDeleteUserDialog(BuildContext context) {
     final TextEditingController idController = TextEditingController();
 
@@ -152,27 +160,57 @@ class _StudentDashboardState extends State<StudentDashboard> {
     );
   }
 
+  // 🎨 [역할별 테마] 배너 색상/제목/문구만 역할에 따라 다르게. 레이아웃 자체는 공통.
+  ({String title, String subtitle, Color color, IconData icon}) _theme() {
+    if (_isDeveloper) {
+      return (
+        title: '👑 MASTER CONTROL',
+        subtitle: '최고 관리 권한 활성화됨',
+        color: Colors.deepPurple[700]!,
+        icon: Icons.admin_panel_settings_rounded,
+      );
+    } else if (widget.role == 'admin') {
+      return (
+        title: '🛠️ ADMIN CONTROL',
+        subtitle: '시스템 관리자 권한 활성화됨',
+        color: Colors.deepPurple[700]!,
+        icon: Icons.admin_panel_settings_rounded,
+      );
+    } else if (widget.role == 'teacher') {
+      return (
+        title: '👨‍🏫 TEACHER PORTAL',
+        subtitle: '교직원 번호: $_displayId | 교사 권한 활성화됨',
+        color: Colors.green[700]!,
+        icon: Icons.admin_panel_settings_rounded,
+      );
+    }
+    return (
+      title: '🎓 STUDENT PORTAL',
+      subtitle: '학번: $_displayId | 인증 완료',
+      color: Colors.indigo[700]!,
+      icon: Icons.school_rounded,
+    );
+  }
+
   @override
   Widget build(BuildContext context) {
     return ListenableBuilder(
       listenable: _controller,
       builder: (context, _) {
-        final bool isDeveloper = widget.studentId == "2061";
+        final theme = _theme();
 
         return Scaffold(
           backgroundColor: Colors.grey[100],
           appBar: AppBar(
             title: Text(
-              isDeveloper ? '👑 MASTER CONTROL' : '🎓 STUDENT PORTAL',
+              theme.title,
               style: const TextStyle(
                 fontWeight: FontWeight.bold,
                 letterSpacing: 1.2,
               ),
             ),
             centerTitle: true,
-            backgroundColor: isDeveloper
+            backgroundColor: theme.color,
-                ? Colors.deepPurple[700]
-                : Colors.indigo[700],
             foregroundColor: Colors.white,
             elevation: 0,
             actions: [
@@ -196,9 +234,7 @@ class _StudentDashboardState extends State<StudentDashboard> {
                     vertical: 28,
                   ),
                   decoration: BoxDecoration(
-                    color: isDeveloper
+                    color: theme.color,
-                        ? Colors.deepPurple[700]
-                        : Colors.indigo[700],
                     borderRadius: const BorderRadius.only(
                       bottomLeft: Radius.circular(32),
                       bottomRight: Radius.circular(32),
@@ -214,18 +250,8 @@ class _StudentDashboardState extends State<StudentDashboard> {
                         ),
                         child: CircleAvatar(
                           radius: 30,
-                          backgroundColor: isDeveloper
+                          backgroundColor: theme.color.withValues(alpha: 0.08),
-                              ? Colors.deepPurple[50]
+                          child: Icon(theme.icon, size: 32, color: theme.color),
-                              : Colors.indigo[50],
-                          child: Icon(
-                            isDeveloper
-                                ? Icons.admin_panel_settings_rounded
-                                : Icons.school_rounded,
-                            size: 32,
-                            color: isDeveloper
-                                ? Colors.deepPurple
-                                : Colors.indigo,
-                          ),
                         ),
                       ),
                       const SizedBox(width: 18),
@@ -233,7 +259,7 @@ class _StudentDashboardState extends State<StudentDashboard> {
                         crossAxisAlignment: CrossAxisAlignment.start,
                         children: [
                           Text(
-                            '${widget.studentName} 님',
+                            '$_displayName 님',
                             style: const TextStyle(
                               fontSize: 22,
                               fontWeight: FontWeight.bold,
@@ -242,9 +268,7 @@ class _StudentDashboardState extends State<StudentDashboard> {
                           ),
                           const SizedBox(height: 4),
                           Text(
-                            isDeveloper
+                            theme.subtitle,
-                                ? '최고 관리 권한 활성화됨'
-                                : '학번: ${widget.studentId} | 인증 완료',
                             style: TextStyle(
                               color: Colors.white.withValues(alpha: 0.8),
                               fontSize: 14,
@@ -264,9 +288,7 @@ class _StudentDashboardState extends State<StudentDashboard> {
                         width: 4,
                         height: 18,
                         decoration: BoxDecoration(
-                          color: isDeveloper
+                          color: theme.color,
-                              ? Colors.deepPurple
-                              : Colors.indigo,
                           borderRadius: BorderRadius.circular(2),
                         ),
                       ),
@@ -302,8 +324,8 @@ class _StudentDashboardState extends State<StudentDashboard> {
                             mainAxisSpacing: 16,
                             childAspectRatio: 0.95,
                             children: [
-                              // 🆕 [변경 지점] 기기가 일치하면 정상 활성화, 일치하지 않으면 자물쇠Lock 처리
+                              // 👨‍🎓 학생 전용 -----------------------------------
-                              if (isDeveloper || widget.studentId != "2061")
+                              if (_isStudent)
                                 _buildModernCard(
                                   icon: widget.isDeviceMatched
                                       ? Icons.contactless_rounded
@@ -331,8 +353,7 @@ class _StudentDashboardState extends State<StudentDashboard> {
                                   isActionButton: widget.isDeviceMatched,
                                   isLoading: _controller.isLoading,
                                 ),
-
+                              if (_isStudent)
-                              // 🆕 [추가 지점] 기기 일치 여부 상관없이 태블릿에서도 누구나 확인 가능한 학교 상황판 카드
                                 _buildModernCard(
                                   icon: Icons.fastfood_rounded,
                                   title: '실시간 학교 상황',
@@ -341,13 +362,14 @@ class _StudentDashboardState extends State<StudentDashboard> {
                                   onTap: () {
                                     ScaffoldMessenger.of(context).showSnackBar(
                                       const SnackBar(
-                                      content: Text('🍔 실시간 학교 상황 페이지로 이동합니다.'),
+                                        content: Text(
+                                          '🍔 실시간 학교 상황 페이지로 이동합니다.',
+                                        ),
                                       ),
                                     );
                                   },
                                 ),
-
+                              if (_isStudent)
-                              // 📱 패드는 NFC가 안 되니, 시간+목적 적어서 신청 → 선생님 승인받는 대체 절차
                                 _buildModernCard(
                                   icon: Icons.tablet_mac_rounded,
                                   title: '스마트기기 반출',
@@ -358,19 +380,20 @@ class _StudentDashboardState extends State<StudentDashboard> {
                                     MaterialPageRoute(
                                       builder: (context) =>
                                           DeviceCheckoutRequestScreen(
-                                          studentId: widget.studentId,
+                                            studentId: _displayId,
-                                          studentName: widget.studentName,
+                                            studentName: _displayName,
                                           ),
                                     ),
                                   ),
                                 ),
 
-                              if (isDeveloper)
+                              // 👨‍🏫 교사 이상 -----------------------------------
+                              if (_isTeacherOrAbove)
                                 _buildModernCard(
-                                  icon: Icons.monitor_heart_rounded,
+                                  icon: Icons.assignment_turned_in_rounded,
-                                  title: '실시간 현황',
+                                  title: '실시간 출석 확인',
-                                  subtitle: '교사용 수거 모니터링',
+                                  subtitle: '학생 제출 로그 모니터링',
-                                  color: Colors.teal,
+                                  color: Colors.blue,
                                   onTap: () => Navigator.push(
                                     context,
                                     MaterialPageRoute(
@@ -379,7 +402,40 @@ class _StudentDashboardState extends State<StudentDashboard> {
                                     ),
                                   ),
                                 ),
-                              if (isDeveloper)
+                              if (_isTeacherOrAbove)
+                                _buildModernCard(
+                                  icon: Icons.manage_accounts_rounded,
+                                  title: '학생 계정 관리',
+                                  subtitle: '계정 추가 및 강제 리셋',
+                                  color: Colors.orange,
+                                  onTap: () => Navigator.push(
+                                    context,
+                                    MaterialPageRoute(
+                                      builder: (context) =>
+                                          const TeacherStudentManagementPage(),
+                                    ),
+                                  ),
+                                ),
+                              if (_isTeacherOrAbove)
+                                _buildModernCard(
+                                  icon: Icons.tablet_mac_rounded,
+                                  title: '스마트기기 반출 대장',
+                                  subtitle: '패드 반출 신청 승인/거절',
+                                  color: Colors.teal,
+                                  onTap: () => Navigator.push(
+                                    context,
+                                    MaterialPageRoute(
+                                      builder: (context) =>
+                                          DeviceCheckoutLedgerPage(
+                                            teacherId: widget.userId,
+                                            teacherName: widget.userName,
+                                          ),
+                                    ),
+                                  ),
+                                ),
+
+                              // 🛠️ 관리자 전용 -----------------------------------
+                              if (_isAdmin)
                                 _buildModernCard(
                                   icon: Icons.terminal_rounded,
                                   title: '서버 DB 제어',
@@ -393,21 +449,7 @@ class _StudentDashboardState extends State<StudentDashboard> {
                                     ),
                                   ),
                                 ),
-                              if (isDeveloper)
+                              if (_isAdmin)
-                                _buildModernCard(
-                                  icon: Icons.add_moderator_rounded,
-                                  title: '학생 계정 관리',
-                                  subtitle: 'UUID 리셋 및 승인',
-                                  color: Colors.purple,
-                                  onTap: () => Navigator.push(
-                                    context,
-                                    MaterialPageRoute(
-                                      builder: (context) =>
-                                          const TeacherStudentManagementPage(),
-                                    ),
-                                  ),
-                                ),
-                              if (isDeveloper)
                                 _buildModernCard(
                                   icon: Icons.delete_sweep_rounded,
                                   title: '계정 강제 삭제',
@@ -415,7 +457,7 @@ class _StudentDashboardState extends State<StudentDashboard> {
                                   color: Colors.red[600]!,
                                   onTap: () => _showDeleteUserDialog(context),
                                 ),
-                              if (isDeveloper)
+                              if (_isAdmin)
                                 _buildModernCard(
                                   icon: Icons.edit_note_rounded,
                                   title: 'NFC 태그 쓰기',
@@ -445,7 +487,7 @@ class _StudentDashboardState extends State<StudentDashboard> {
     );
   }
 
-  // 5️⃣ [카드 디자인 위젯] - 기존 형태 완전 보존
+  // 💎 [카드 디자인 위젯] 학생/교사 대시보드에서 쓰던 것과 동일 — 이제 한 곳에만 존재.
   Widget _buildModernCard({
     required IconData icon,
     required String title,
@@ -489,14 +531,16 @@ class _StudentDashboardState extends State<StudentDashboard> {
                 Row(
                   mainAxisAlignment: MainAxisAlignment.spaceBetween,
                   children: [
-                    Text(
+                    Expanded(
+                      child: Text(
                         title,
                         style: const TextStyle(
-                        fontSize: 16,
+                          fontSize: 15,
                           fontWeight: FontWeight.bold,
                           color: Colors.black87,
                         ),
                       ),
+                    ),
                     if (isLoading)
                       const SizedBox(
                         width: 16,

lib/ui/teacher_dashboard.dart

@@ -1,295 +0,0 @@
-// 👨‍🏫 교사 대시보드. 실시간 출석 확인, 학생 계정 관리 화면으로 가는 메뉴만 담당한다.
-import 'package:flutter/material.dart';
-import 'device_checkout_ledger_page.dart';
-import 'login_screen.dart';
-import 'teacher_attendance_page.dart';
-import 'teacher_student_management_page.dart';
-
-// ==========================================
-// 👨‍🏫 4. 선생님 대시보드 (기존 3초 타이머 완벽 유지)
-// ==========================================
-class TeacherDashboard extends StatefulWidget {
-  final String? teacherId;
-  final String? teacherName;
-
-  const TeacherDashboard({super.key, this.teacherId, this.teacherName});
-
-  @override
-  State<TeacherDashboard> createState() => _TeacherDashboardState();
-}
-
-class _TeacherDashboardState extends State<TeacherDashboard> {
-  // 🧼 [수정] 사용하지 않던 _isLoading 변수를 삭제하여 경고를 완벽히 해결했습니다!
-
-  @override
-  Widget build(BuildContext context) {
-    // 다른 화면에서 null이 넘어왔을 때를 대비한 안전망 방탄 코드
-    final String displayName = widget.teacherName ?? "간편인증 선생";
-    final String displayId = widget.teacherId ?? "간편인증";
-
-    return Scaffold(
-      backgroundColor: Colors.grey[100],
-      appBar: AppBar(
-        title: const Text(
-          '👨‍🏫 TEACHER PORTAL',
-          style: TextStyle(fontWeight: FontWeight.bold, letterSpacing: 1.2),
-        ),
-        centerTitle: true,
-        backgroundColor: Colors.green[700], // 교사 전용 그린 테마 컬러
-        foregroundColor: Colors.white,
-        elevation: 0,
-        actions: [
-          IconButton(
-            icon: const Icon(Icons.logout_rounded),
-            onPressed: () => Navigator.pushReplacement(
-              context,
-              MaterialPageRoute(builder: (context) => const LoginScreen()),
-            ),
-          ),
-        ],
-      ),
-      body: SingleChildScrollView(
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            // 💳 [상단 배너 가이드] StudentDashboard와 100% 일치하는 프로필 카드 레이아웃
-            Container(
-              width: double.infinity,
-              padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 28),
-              decoration: BoxDecoration(
-                color: Colors.green[700],
-                borderRadius: const BorderRadius.only(
-                  bottomLeft: Radius.circular(32),
-                  bottomRight: Radius.circular(32),
-                ),
-              ),
-              child: Row(
-                children: [
-                  Container(
-                    padding: const EdgeInsets.all(4),
-                    decoration: const BoxDecoration(
-                      color: Colors.white,
-                      shape: BoxShape.circle,
-                    ),
-                    child: CircleAvatar(
-                      radius: 30,
-                      backgroundColor: Colors.green[50],
-                      child: Icon(
-                        Icons.admin_panel_settings_rounded,
-                        size: 32,
-                        color: Colors.green[700],
-                      ),
-                    ),
-                  ),
-                  const SizedBox(width: 18),
-                  Column(
-                    crossAxisAlignment: CrossAxisAlignment.start,
-                    children: [
-                      Text(
-                        '$displayName 님',
-                        style: const TextStyle(
-                          fontSize: 22,
-                          fontWeight: FontWeight.bold,
-                          color: Colors.white,
-                        ),
-                      ),
-                      const SizedBox(height: 4),
-                      Text(
-                        '교직원 번호: $displayId | 교사 권한 활성화됨',
-                        style: TextStyle(
-                          color: Colors.white.withValues(alpha: 0.8),
-                          fontSize: 14,
-                        ),
-                      ),
-                    ],
-                  ),
-                ],
-              ),
-            ),
-            const SizedBox(height: 32),
-
-            // 🏷️ [세로 바 타이틀 인디케이터] 구조 일치화
-            Padding(
-              padding: const EdgeInsets.symmetric(horizontal: 24.0),
-              child: Row(
-                children: [
-                  Container(
-                    width: 4,
-                    height: 18,
-                    decoration: BoxDecoration(
-                      color: Colors.green[700],
-                      borderRadius: BorderRadius.circular(2),
-                    ),
-                  ),
-                  const SizedBox(width: 10),
-                  const Text(
-                    '스마트 교사용 관리 메뉴',
-                    style: TextStyle(
-                      fontSize: 18,
-                      fontWeight: FontWeight.bold,
-                      color: Colors.black87,
-                    ),
-                  ),
-                ],
-              ),
-            ),
-            const SizedBox(height: 16),
-
-            // 📊 [그리드 레이아웃 메뉴] 시후의 카드 컴포넌트 스타일 적용
-            LayoutBuilder(
-              builder: (context, constraints) {
-                // 🖥️ 웹(넓은 화면)은 한 줄에 5개씩, 폰(좁은 화면)은 기존 2개 그대로.
-                final bool isWide = constraints.maxWidth >= 800;
-                return Center(
-                  child: ConstrainedBox(
-                    constraints: BoxConstraints(maxWidth: isWide ? 1300 : 700),
-                    child: Padding(
-                      padding: const EdgeInsets.symmetric(horizontal: 24.0),
-                      child: GridView.count(
-                        shrinkWrap: true,
-                        physics: const NeverScrollableScrollPhysics(),
-                        crossAxisCount: isWide ? 5 : 2,
-                        crossAxisSpacing: 16,
-                        mainAxisSpacing: 16,
-                        childAspectRatio: 0.95,
-                        children: [
-                          _buildModernCard(
-                            icon: Icons.assignment_turned_in_rounded,
-                            title: '실시간 출석 확인',
-                            subtitle: '학생 제출 로그 모니터링',
-                            color: Colors.blue,
-                            onTap: () => Navigator.push(
-                              context,
-                              MaterialPageRoute(
-                                builder: (context) =>
-                                    const TeacherAttendancePage(),
-                              ),
-                            ),
-                          ),
-                          _buildModernCard(
-                            icon: Icons.manage_accounts_rounded,
-                            title: '학생 계정 관리',
-                            subtitle: '계정 추가 및 강제 리셋',
-                            color: Colors.orange,
-                            onTap: () => Navigator.push(
-                              context,
-                              MaterialPageRoute(
-                                builder: (context) =>
-                                    const TeacherStudentManagementPage(),
-                              ),
-                            ),
-                          ),
-                          _buildModernCard(
-                            icon: Icons.tablet_mac_rounded,
-                            title: '스마트기기 반출 대장',
-                            subtitle: '패드 반출 신청 승인/거절',
-                            color: Colors.teal,
-                            onTap: () => Navigator.push(
-                              context,
-                              MaterialPageRoute(
-                                builder: (context) => DeviceCheckoutLedgerPage(
-                                  teacherId: widget.teacherId,
-                                  teacherName: widget.teacherName,
-                                ),
-                              ),
-                            ),
-                          ),
-                        ],
-                      ),
-                    ),
-                  ),
-                );
-              },
-            ),
-            const SizedBox(height: 32),
-          ],
-        ),
-      ),
-    );
-  }
-
-  // 💎 [시후 대시보드 전용 카드 위젯 이식 완료]
-  Widget _buildModernCard({
-    required IconData icon,
-    required String title,
-    required String subtitle,
-    required Color color,
-    required VoidCallback onTap,
-    bool isActionButton = false,
-    bool isLoading = false,
-  }) {
-    return InkWell(
-      onTap: isLoading ? null : onTap,
-      borderRadius: BorderRadius.circular(24),
-      child: Ink(
-        padding: const EdgeInsets.all(20),
-        decoration: BoxDecoration(
-          color: Colors.white,
-          borderRadius: BorderRadius.circular(24),
-          boxShadow: [
-            BoxShadow(
-              color: Colors.black.withValues(alpha: 0.04),
-              blurRadius: 16,
-              offset: const Offset(0, 4),
-            ),
-          ],
-        ),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          mainAxisAlignment: MainAxisAlignment.spaceBetween,
-          children: [
-            Container(
-              padding: const EdgeInsets.all(12),
-              decoration: BoxDecoration(
-                color: color.withValues(alpha: 0.1),
-                borderRadius: BorderRadius.circular(16),
-              ),
-              child: Icon(icon, color: color, size: 28),
-            ),
-            Column(
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                Row(
-                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
-                  children: [
-                    Expanded(
-                      child: Text(
-                        title,
-                        style: const TextStyle(
-                          fontSize: 15,
-                          fontWeight: FontWeight.bold,
-                          color: Colors.black87,
-                        ),
-                      ),
-                    ),
-                    if (isLoading)
-                      const SizedBox(
-                        width: 16,
-                        height: 16,
-                        child: CircularProgressIndicator(strokeWidth: 2),
-                      )
-                    else if (isActionButton)
-                      Icon(
-                        Icons.touch_app_rounded,
-                        size: 16,
-                        color: color.withValues(alpha: 0.5),
-                      ),
-                  ],
-                ),
-                const SizedBox(height: 4),
-                Text(
-                  subtitle,
-                  style: TextStyle(
-                    fontSize: 12,
-                    color: Colors.grey[500],
-                    height: 1.2,
-                  ),
-                ),
-              ],
-            ),
-          ],
-        ),
-      ),
-    );
-  }
-}