M2c：前端镜树页（路径阅读流/候答切换/采用归真/局部树图/SSE 芽体）与灵胚页（创建/导入卡/照心试演/启镜），契约错误码段接入前端

frontend/src/components/layout/Sidebar.tsx

@@ -7,6 +7,7 @@ import { LogoButton } from "@/components/easter-egg/LogoButton";
 import {
   AdminIcon,
   ArchiveIcon,
+  ChatIcon,
   CharacterIcon,
   CosmosIcon,
   DriveIcon,
@@ -51,11 +52,15 @@ interface NavGroup {
 const NAV_GROUPS: NavGroup[] = [
   {
     title: "灵台",
-    items: [{ href: "/runs", label: "轨迹", icon: <RunIcon /> }],
+    items: [
+      { href: "/trees", label: "镜树", icon: <ChatIcon /> },
+      { href: "/runs", label: "轨迹", icon: <RunIcon /> },
+    ],
   },
   {
     title: "法身",
     items: [
+      { href: "/embryos", label: "灵胚", icon: <CharacterIcon /> },
       { href: "/cosmos", label: "灵枢", icon: <CosmosIcon /> },
       { href: "/wuxing", label: "五行", icon: <WuxingIcon /> },
       { href: "/characters", label: "人物", icon: <CharacterIcon /> },