feat: 业务链条配置管理导航与顶栏用户名统一

业务链条页增加配置管理入口与返回导航；配置管理页通过 aliasPaths 保持侧栏选中；顶栏用户名与设置个人信息页共用 getAccountDisplayName。

frontend-web/src/pages/BusinessChainMappingPage.tsx

@@ -9,6 +9,7 @@ import { motion } from "motion/react";
 import { Select } from "tdesign-react";
 import {
   AlertCircle,
+  ArrowLeft,
   HelpCircle,
   Info,
   Link2,
@@ -21,6 +22,7 @@ import {
 import { toast } from "sonner";
 
 import { useTheme } from "@/contexts/ThemeContext";
+import { useRouteNavigate } from "@/core/route-base";
 import { listAgents } from "@/core/agents/api";
 import type { Agent } from "@/core/agents/types";
 import { listChains } from "@/roundtable-planning/api/chains";
@@ -34,6 +36,7 @@ import { cn } from "@/lib/utils";
 import { useDesensitizeSubtree } from "@/roundtable-planning/lib/use-desensitize-subtree";
 
 export default function BusinessChainMappingPage() {
+  const navigate = useRouteNavigate();
   const { theme } = useTheme();
   const isDark = theme === "dark";
   // 整片脱敏：业务链条映射页展示文本（链条名/描述/席位名/标题）。输入框 Hook 自动跳过。
@@ -233,6 +236,20 @@ export default function BusinessChainMappingPage() {
               </span>
             </div>
           </div>
+
+          <button
+            type="button"
+            onClick={() => navigate("/page/strategy/business-chains")}
+            className={cn(
+              "relative z-10 inline-flex shrink-0 items-center gap-1.5 rounded-[5px] border px-3.5 py-2 text-xs font-semibold transition-all active:scale-95",
+              isDark
+                ? "border-white/10 bg-white/5 text-slate-300 hover:bg-white/10 hover:text-slate-100"
+                : "border-slate-200 bg-white text-slate-600 hover:bg-slate-50 hover:text-slate-900",
+            )}
+          >
+            <ArrowLeft className="size-3.5" />
+            返回业务链条
+          </button>
         </motion.div>
 
         {/* ── 表格区 ── */}