승인 단계 삭제 복구 흐름 구현하고 API 정렬 문서 추가

lib/features/approvals/presentation/pages/approval_page.dart

@@ -173,7 +173,7 @@ class _ApprovalEnabledPageState extends State<_ApprovalEnabledPage> {
           actions: [
             ShadButton(
               leading: const Icon(lucide.LucideIcons.plus, size: 16),
-              onPressed: () {},
+              onPressed: _openCreateApprovalDialog,
               child: const Text('신규 결재'),
             ),
           ],
@@ -357,6 +357,116 @@ class _ApprovalEnabledPageState extends State<_ApprovalEnabledPage> {
     );
   }
 
+  /// 신규 결재 등록 다이얼로그를 열어 UI 단계에서 필요한 필드와 안내를 제공한다.
+  Future<void> _openCreateApprovalDialog() async {
+    final transactionController = TextEditingController();
+    final noteController = TextEditingController();
+    var submitted = false;
+
+    final shouldShowToast = await showDialog<bool>(
+      context: context,
+      builder: (dialogContext) {
+        return StatefulBuilder(
+          builder: (context, setState) {
+            final shadTheme = ShadTheme.of(context);
+            final errorVisible =
+                submitted && transactionController.text.trim().isEmpty;
+
+            return SuperportDialog(
+              title: '신규 결재 등록',
+              description: '트랜잭션 정보를 입력하면 API 연동 시 자동 제출이 지원됩니다.',
+              constraints: const BoxConstraints(maxWidth: 480),
+              actions: [
+                ShadButton.ghost(
+                  onPressed: () => Navigator.of(dialogContext).pop(false),
+                  child: const Text('닫기'),
+                ),
+                ShadButton(
+                  key: const ValueKey('approval_create_submit'),
+                  onPressed: () {
+                    final trimmed = transactionController.text.trim();
+                    setState(() => submitted = true);
+                    if (trimmed.isEmpty) {
+                      return;
+                    }
+                    Navigator.of(dialogContext).pop(true);
+                  },
+                  child: const Text('임시 저장'),
+                ),
+              ],
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.stretch,
+                mainAxisSize: MainAxisSize.min,
+                children: [
+                  Text('트랜잭션 ID', style: shadTheme.textTheme.small),
+                  const SizedBox(height: 8),
+                  ShadInput(
+                    key: const ValueKey('approval_create_transaction'),
+                    controller: transactionController,
+                    placeholder: const Text('예: 2404-TRX-001'),
+                    onChanged: (_) => setState(() {}),
+                  ),
+                  if (errorVisible)
+                    Padding(
+                      padding: const EdgeInsets.only(top: 6),
+                      child: Text(
+                        '트랜잭션 ID를 입력해야 결재 생성이 가능합니다.',
+                        style: shadTheme.textTheme.small.copyWith(
+                          color: Theme.of(context).colorScheme.error,
+                        ),
+                      ),
+                    ),
+                  const SizedBox(height: 16),
+                  Text('비고 (선택)', style: shadTheme.textTheme.small),
+                  const SizedBox(height: 8),
+                  ShadTextarea(
+                    key: const ValueKey('approval_create_note'),
+                    controller: noteController,
+                    minHeight: 120,
+                    maxHeight: 220,
+                  ),
+                  const SizedBox(height: 16),
+                  Container(
+                    padding: const EdgeInsets.all(12),
+                    decoration: BoxDecoration(
+                      color: shadTheme.colorScheme.mutedForeground.withValues(
+                        alpha: 0.08,
+                      ),
+                      borderRadius: BorderRadius.circular(12),
+                    ),
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: const [
+                        Text(
+                          'API 연동 준비 중',
+                          style: TextStyle(fontWeight: FontWeight.w600),
+                        ),
+                        SizedBox(height: 6),
+                        Text(
+                          '현재는 결재 생성 UI만 제공됩니다. 실제 저장은 백엔드 연동 이후 지원될 예정입니다.',
+                        ),
+                      ],
+                    ),
+                  ),
+                ],
+              ),
+            );
+          },
+        );
+      },
+    );
+
+    transactionController.dispose();
+    noteController.dispose();
+
+    if (shouldShowToast == true && mounted) {
+      SuperportToast.info(
+        context,
+        '결재 생성은 API 연동 이후 지원될 예정입니다. 입력한 값은 실제로 저장되지 않았습니다.',
+      );
+    }
+  }
+
   void _applyFilters() {
     _controller.updateQuery(_searchController.text.trim());
     if (_dateRange != null) {