feat: 看板在制品点击跳转任务全景并自动展开流转树

Dashboard: WipRow 点击改为 nav(/admin/tasks?sn=xxx)
AdminTasksPage: 读取 ?sn= 参数 → 自动搜索 → 产品加载后自动展开流转树

frontend/src/pages/admin/AdminDashboard.tsx

@@ -81,7 +81,7 @@ function WipRow({ t }: { t: WipTask }) {
   const nav = useNavigate();
   const handleClick = () => {
     if (t.product_sn) {
-      nav(`/scan?sn=${t.product_sn}`);
+      nav(`/admin/tasks?sn=${t.product_sn}`);
     }
   };
   return (

frontend/src/pages/admin/AdminTasksPage.tsx

@@ -1,5 +1,6 @@
 /** 任务全景 Dashboard — 按订单聚合 + 关键词搜索 + 状态筛选 */
 import { useState, useEffect, useMemo, useCallback } from "react";
+import { useSearchParams } from "react-router-dom";
 import {
   Search, Loader2, Package, ChevronDown, ChevronRight,
   Warehouse, GitBranch, X,
@@ -35,6 +36,7 @@ interface OrderGroup {
 export default function AdminTasksPage() {
   const { toast } = useToast();
   const { user: currentUser } = useAuth();
+  const [searchParams] = useSearchParams();
 
   // 搜索 & 筛选
   const [keyword, setKeyword] = useState("");
@@ -57,6 +59,9 @@ export default function AdminTasksPage() {
   const [submitting, setSubmitting] = useState(false);
   const [qrSerial, setQrSerial] = useState<string | null>(null); // 🔧 QR弹窗
 
+  // 从看板跳转: ?sn=xxx → 自动搜索 + 自动展开流转树
+  const autoSn = searchParams.get("sn") || "";
+
   // ---- 加载产品列表（始终拉全量，不做服务端状态过滤） ----
   async function loadProducts(kw: string) {
     setLoading(true);
@@ -66,14 +71,27 @@ export default function AdminTasksPage() {
       if (kw.trim()) params.keyword = kw.trim();
       const { data } = await api.get<ProductResponse[]>("/products/", { params });
       setProducts(data);
+      return data;
     } catch {
       setError("加载产品列表失败，请检查后端服务");
+      return [];
     } finally {
       setLoading(false);
     }
   }
 
-  useEffect(() => { loadProducts(keyword); }, []); // eslint-disable-line react-hooks/exhaustive-deps
+  useEffect(() => {
+    if (autoSn) {
+      setKeyword(autoSn);
+      loadProducts(autoSn).then((data) => {
+        // 产品加载完成后自动展开流转树
+        const found = data.find((p: ProductResponse) => p.serial_number === autoSn);
+        if (found) toggleProductTree(found.serial_number);
+      });
+    } else {
+      loadProducts(keyword);
+    }
+  }, []); // eslint-disable-line react-hooks/exhaustive-deps
 
   function handleSearch(e?: React.FormEvent) {
     e?.preventDefault();