refactor: 菜单栏角色化降噪（role-based-navigation-simplification）

client/src/features/mobile/navigation.ts

@@ -42,7 +42,7 @@ export type MobileNavItem = {
 
 export const MOBILE_NAV_ITEMS: MobileNavItem[] = [
   { key: "home", to: "/mobile", label: "首页", icon: "home" },
-  { key: "approvals", to: "/mobile/approvals", label: "审批", icon: "fact_check" },
+  { key: "approvals", to: "/mobile/approvals", label: "待办", icon: "fact_check" },
   { key: "reimbursements", to: "/mobile/reimbursements", label: "报销", icon: "request_quote", anyOf: MOBILE_REIMBURSEMENT_PERMISSIONS },
   { key: "me", to: "/mobile/me", label: "我的", icon: "person" },
 ];