feat: 新增备课模块并修复全模块 P0/P1/P2 缺陷

主要变更:

- 新增 lesson-preparation 模块: 备课编辑器、节点编辑、AI 建议、知识点选择、版本历史、作业发布

- 新增 shared 通用组件: charts/question-bank-filters/schedule-list/ui (chip-nav/filter-bar/page-header/stat-card/stat-item)

- 新增 student/admin 端 loading.tsx 与 error.tsx, 优化加载与错误态体验

- 新增 teacher/lesson-plans 页面 (列表/新建/编辑)

- 新增 drizzle 迁移 0002_tiny_lionheart 及 snapshot

- 新增 textbooks/schema.ts 与 exams/utils/normalize-structure.ts

- 修复 Tiptap v3 SSR hydration 崩溃 (rich-text-block immediatelyRender: false)

- 重构多模块 data-access/actions/组件, 修复权限校验与类型规范

- 同步架构文档 004/005 反映新增模块、导出、依赖关系

- 归档 bugs/* 测试报告与 e2e 测试脚本 (admin/parent/student/teacher web_test)

src/modules/parent/components/child-detail-header.tsx

@@ -4,15 +4,20 @@ import { ArrowLeft, GraduationCap } from "lucide-react"
 import { Avatar, AvatarFallback, AvatarImage } from "@/shared/components/ui/avatar"
 import { Badge } from "@/shared/components/ui/badge"
 import { Button } from "@/shared/components/ui/button"
+import { getInitials } from "@/shared/lib/utils"
 import type { ChildDashboardData } from "@/modules/parent/types"
 
-const getInitials = (name: string | null) => {
-  if (!name) return "S"
-  return name.slice(0, 2).toUpperCase()
+/** 将邮箱掩码为 j***@example.com 形式，防止爬虫与旁人窥屏。 */
+function maskEmail(email: string): string {
+  const [local, domain] = email.split("@")
+  if (!local || !domain) return email
+  const maskedLocal = local.length <= 1 ? local : `${local[0]}***`
+  return `${maskedLocal}@${domain}`
 }
 
 export function ChildDetailHeader({ child }: { child: ChildDashboardData }) {
   const { basicInfo } = child
+  const childName = basicInfo.name ?? "Child"
 
   return (
     <div className="space-y-4">
@@ -24,7 +29,7 @@ export function ChildDetailHeader({ child }: { child: ChildDashboardData }) {
       </Button>
       <div className="flex items-center gap-4">
         <Avatar className="h-16 w-16">
-          <AvatarImage src={basicInfo.image ?? undefined} alt={basicInfo.name ?? "Child"} />
+          <AvatarImage src={basicInfo.image ?? undefined} alt={childName} />
           <AvatarFallback className="text-lg">{getInitials(basicInfo.name)}</AvatarFallback>
         </Avatar>
         <div className="space-y-1">
@@ -40,7 +45,7 @@ export function ChildDetailHeader({ child }: { child: ChildDashboardData }) {
               </span>
             ) : null}
             {basicInfo.relation ? <span>· {basicInfo.relation}</span> : null}
-            <span>· {basicInfo.email}</span>
+            <span title={basicInfo.email}>· {maskEmail(basicInfo.email)}</span>
           </div>
         </div>
       </div>