fix: 修复loadDashboardStats中userInfo未定义的问题

frontend/src/views/TaskHall.vue

@@ -4278,9 +4278,12 @@ const loadDashboardStats = async () => {
     const params: { month?: string; deptId?: number } = {}
     if (month) params.month = month
     
+    // 从 localStorage 获取用户信息
+    const userInfo = JSON.parse(localStorage.getItem('userInfo') || '{}')
+    
     // 只有部门负责人切换了部门视角时才传递 deptId
     // 普通用户不传 deptId，后端会根据 userId 查询个人数据
-    const isDeptLeader = userInfo.value?.isDepartmentLeader || false
+    const isDeptLeader = userInfo.isDepartmentLeader === 1 || userInfo.isDepartmentLeader === true || managedDepartments.value.length > 0
     if (isDeptLeader && currentDeptView.value !== undefined) {
       // 部门负责人且切换了部门视角
       params.deptId = currentDeptView.value