feat: add carrier-aware signature retirement alerts

src/layouts/AppShell.tsx

@@ -2,6 +2,7 @@ import type { ComponentType } from 'react';
 import { useEffect, useMemo, useRef, useState } from 'react';
 import {
   Bell,
+  ClipboardList,
   ChevronDown,
   ChevronRight,
   CircleHelp,
@@ -59,6 +60,7 @@ type AppShellProps = {
   userRole: string;
   navSections: ShellNavSection[];
   auditNotifications?: AuditNotificationItem[];
+  retirementAlert?: { count: number; to: string };
   onSessionLockedChange?: (locked: boolean) => void;
 };
 
@@ -71,6 +73,7 @@ export function AppShell({
   userRole,
   navSections,
   auditNotifications = [],
+  retirementAlert,
   onSessionLockedChange,
 }: AppShellProps) {
   const [collapsed, setCollapsed] = useState(false);
@@ -414,6 +417,17 @@ export function AppShell({
             <button className="icon-button topbar-help" type="button" aria-label="帮助中心">
               <CircleHelp size={18} />
             </button>
+            {retirementAlert ? (
+              <Link
+                aria-label={`今日未读且未抑制签名清退预警 ${retirementAlert.count} 条`}
+                className={['icon-button', retirementAlert.count > 0 ? 'has-dot' : ''].filter(Boolean).join(' ')}
+                title="今日未读且未抑制签名清退预警"
+                to={retirementAlert.to}
+              >
+                <Bell size={18} />
+                {retirementAlert.count > 0 ? <span className="notice-count">{retirementAlert.count}</span> : null}
+              </Link>
+            ) : null}
             <div className="notice-menu-wrap">
               <button
                 aria-expanded={noticeOpen}
@@ -423,7 +437,7 @@ export function AppShell({
                 type="button"
                 aria-label="通知"
               >
-                <Bell size={18} />
+                <ClipboardList size={18} />
                 {auditTotal > 0 ? <span className="notice-count">{auditTotal}</span> : null}
               </button>
               {noticeOpen ? (