修正用戶管理查詢失敗問題

components/admin/admin-layout.tsx

@@ -171,7 +171,7 @@ export function AdminLayout({ children, currentPage, onPageChange }: AdminLayout
     setShowLogoutDialog(false)
 
     // Check if this is a popup/new tab opened from main site
-    if (window.opener && !window.opener.closed) {
+    if (typeof window !== 'undefined' && window.opener && !window.opener.closed) {
       // If opened from another window, close this tab and focus parent
       window.opener.focus()
       window.close()
@@ -214,7 +214,7 @@ export function AdminLayout({ children, currentPage, onPageChange }: AdminLayout
               <Button onClick={() => (window.location.href = "/")} variant="outline">
                 返回首頁
               </Button>
-              {window.opener && !window.opener.closed && (
+              {typeof window !== 'undefined' && window.opener && !window.opener.closed && (
                 <Button
                   onClick={() => {
                     window.opener.focus()

components/admin/user-management.tsx

@@ -85,7 +85,9 @@ export function UserManagement() {
           const usersData = await usersResponse.json()
           setUsers(usersData.users || [])
         } else {
-          console.error('獲取用戶列表失敗')
+          const errorData = await usersResponse.json().catch(() => ({}))
+          console.error('獲取用戶列表失敗:', errorData.error || usersResponse.statusText)
+          setError(errorData.error || '獲取用戶列表失敗')
         }
 
         // 獲取統計資料
@@ -99,7 +101,8 @@ export function UserManagement() {
           const statsData = await statsResponse.json()
           setStats(statsData)
         } else {
-          console.error('獲取統計資料失敗')
+          const errorData = await statsResponse.json().catch(() => ({}))
+          console.error('獲取統計資料失敗:', errorData.error || statsResponse.statusText)
         }
       } catch (error) {
         console.error('載入資料失敗:', error)