fix(tasks): 右上角仅保留翻页倒计时，去掉总数/页码

- TaskDisplay.jsx tasks-head-info 精简为只剩「翻页 Ns」。

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

src/pages/TaskDisplay.jsx

@@ -90,15 +90,9 @@ export default function TaskDisplay() {
         <span className="tasks-head-dot" />
         <span className="tasks-head-title">系统任务中心</span>
         <span className="tasks-head-sub">扫码即可接单 · 园区企业发标 · 合伙人接单</span>
-        {/* 右上角信息：一行平铺 —— 总数 / 翻页倒计时 / 页码 / 接单说明 */}
+        {/* 右上角：仅翻页倒计时 */}
         <div className="tasks-head-info">
-          <span className="tasks-info">总数 <b>{tasks.length}</b></span>
-          <span className="tasks-info-sep">·</span>
           <span className="tasks-info">翻页 <b>{pageCount > 1 ? `${countdown}s` : '—'}</b></span>
-          <span className="tasks-info-sep">·</span>
-          <span className="tasks-info">页码 <b>{pageCount > 1 ? `${displayedPage + 1}/${pageCount}` : '1/1'}</b></span>
-          <span className="tasks-info-sep">·</span>
-          <span className="tasks-info hint">接单：抢单·竞标·指派·推荐</span>
         </div>
       </div>