fix: 移除未使用的 itemCount state

Client/src/api/folders.ts

@@ -32,8 +32,8 @@ export interface FolderPhotoList {
   overQuota: boolean
 }
 
-/** 上传失败的可区分原因 */
-export type UploadError = 'too-large' | 'bad-type' | 'failed'
+/** 上传失败的可区分原因（同 photos.ts，多 'full' 对应 409） */
+export type UploadError = 'full' | 'too-large' | 'bad-type' | 'failed'
 
 /** 列出文件夹内所有图片，含配额信息 */
 export async function listFolderPhotos(

Client/src/components/PhotoWallPage.tsx

@@ -181,7 +181,6 @@ export function PhotoWallPage({ onExit, token, folderName, isAdmin, onForbidden
   const [quotaBytes, setQuotaBytes] = useState(0)
   const [overQuota, setOverQuota] = useState(false)
   const [maxItems, setMaxItems] = useState(0)
-  const [itemCount, setItemCount] = useState(0)
   // 右键菜单滑条：旋转步长 / 缩放步长
   const [rotStep, setRotStep] = useState(15)
   const [zoomStepPx, setZoomStepPx] = useState(30)
@@ -271,7 +270,6 @@ export function PhotoWallPage({ onExit, token, folderName, isAdmin, onForbidden
             photoLayout: photoLayout as unknown as Record<string, Record<string, unknown>>,
           }).then(() => {
             setSaveLabel('已保存')
-            setItemCount(els.length)
           }).catch((e) => {
             if (e instanceof Error && e.message === 'full') {
               showToast('已达 100 条上限，无法保存更多装饰')