fix：传入空字符串也需要存入sessionStorage中

src/routes/RouteChangeHandler.tsx

@@ -28,14 +28,14 @@ export function withRouteChangeHandler(WrappedComponent: React.ComponentType) {
           // 在重定向前缓存查询参数，供 /tactics 页读取（避免 from 被清理导致丢失）
           try {
             if (place) {
-              const userMeta = {
-                cstId: searchParams.get('cstId') || undefined,
-                userId: searchParams.get('userId') || undefined,
-                numberType: searchParams.get('numberType') || undefined,
-                place,
-                busiType: '02',
-                busiId: searchParams.get('userId') || undefined,
-              }
+const userMeta = {
+               cstId: searchParams.get('cstId') ?? undefined,
+               userId: searchParams.get('userId') ?? undefined,
+               numberType: searchParams.get('numberType') ?? undefined,
+               place,
+               busiType: '02',
+               busiId: searchParams.get('userId') ?? undefined,
+             }
               sessionStorage.setItem('userMeta', JSON.stringify(userMeta))
             }
             else {