refactor: UI 컴포넌트 추상화 및 입금/출금 등록 버튼 추가

- 입금관리, 출금관리 리스트에 등록 버튼 추가
- skeleton, confirm-dialog, empty-state, status-badge UI 컴포넌트 추가
- document-system 컴포넌트 추상화 (ApprovalLine, DocumentHeader 등)
- 여러 페이지 컴포넌트 리팩토링 및 코드 정리

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

src/components/board/BoardManagement/BoardDetailClientV2.tsx

@@ -18,16 +18,7 @@ import type { Board, BoardFormData } from './types';
 import { ContentLoadingSpinner } from '@/components/ui/loading-spinner';
 import { ErrorCard } from '@/components/ui/error-card';
 import { Button } from '@/components/ui/button';
-import {
-  AlertDialog,
-  AlertDialogAction,
-  AlertDialogCancel,
-  AlertDialogContent,
-  AlertDialogDescription,
-  AlertDialogFooter,
-  AlertDialogHeader,
-  AlertDialogTitle,
-} from '@/components/ui/alert-dialog';
+import { DeleteConfirmDialog } from '@/components/ui/confirm-dialog';
 import { toast } from 'sonner';
 
 type DetailMode = 'view' | 'edit' | 'create';
@@ -281,37 +272,22 @@ export function BoardDetailClientV2({ boardId, initialMode }: BoardDetailClientV
           onDelete={handleDelete}
         />
 
-        <AlertDialog open={deleteDialogOpen} onOpenChange={setDeleteDialogOpen}>
-          <AlertDialogContent>
-            <AlertDialogHeader>
-              <AlertDialogTitle>게시판 삭제</AlertDialogTitle>
-              <AlertDialogDescription>
-                &quot;{boardData.boardName}&quot; 게시판을 삭제하시겠습니까?
-                <br />
-                <span className="text-destructive">
-                  삭제된 게시판 정보는 복구할 수 없습니다.
-                </span>
-              </AlertDialogDescription>
-            </AlertDialogHeader>
-            <AlertDialogFooter>
-              <AlertDialogCancel disabled={isDeleting}>취소</AlertDialogCancel>
-              <AlertDialogAction
-                onClick={confirmDelete}
-                disabled={isDeleting}
-                className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
-              >
-                {isDeleting ? (
-                  <>
-                    <Loader2 className="w-4 h-4 mr-2 animate-spin" />
-                    삭제 중...
-                  </>
-                ) : (
-                  '삭제'
-                )}
-              </AlertDialogAction>
-            </AlertDialogFooter>
-          </AlertDialogContent>
-        </AlertDialog>
+        <DeleteConfirmDialog
+          open={deleteDialogOpen}
+          onOpenChange={setDeleteDialogOpen}
+          onConfirm={confirmDelete}
+          title="게시판 삭제"
+          description={
+            <>
+              &quot;{boardData.boardName}&quot; 게시판을 삭제하시겠습니까?
+              <br />
+              <span className="text-destructive">
+                삭제된 게시판 정보는 복구할 수 없습니다.
+              </span>
+            </>
+          }
+          loading={isDeleting}
+        />
       </>
     );
   }