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/parent-children-data-page.tsx

@@ -0,0 +1,86 @@
+import type { LucideIcon } from "lucide-react"
+
+import { EmptyState } from "@/shared/components/ui/empty-state"
+
+/**
+ * 家长视角下"多子女数据聚合页"的共享布局。
+ * 用于 attendance / grades 等需要遍历所有子女展示同类数据的页面，
+ * 消除重复的 dataScope 空状态处理与页面骨架代码。
+ */
+export function ParentChildrenDataPage<T>({
+  title,
+  description,
+  icon,
+  noRecordsTitle,
+  noRecordsDescription,
+  items,
+  renderItem,
+}: {
+  title: string
+  description: string
+  icon: LucideIcon
+  noRecordsTitle: string
+  noRecordsDescription: string
+  items: T[]
+  renderItem: (item: T) => React.ReactNode
+}) {
+  const hasItems = items.length > 0
+
+  return (
+    <div className="h-full flex-1 flex-col space-y-8 p-6 md:p-8 md:flex">
+      <div>
+        <h2 className="text-2xl font-bold tracking-tight">{title}</h2>
+        <p className="text-muted-foreground">{description}</p>
+      </div>
+
+      {!hasItems ? (
+        <EmptyState
+          title={noRecordsTitle}
+          description={noRecordsDescription}
+          icon={icon}
+          className="border-none shadow-none"
+        />
+      ) : (
+        <div className="space-y-8">
+          {items.map((item, idx) => (
+            <div key={idx} className="space-y-4">
+              {renderItem(item)}
+            </div>
+          ))}
+        </div>
+      )}
+    </div>
+  )
+}
+
+/**
+ * dataScope 为空（家长未关联子女）时的统一空状态页面。
+ */
+export function ParentNoChildrenPage({
+  title,
+  description,
+  icon,
+  emptyTitle,
+  emptyDescription,
+}: {
+  title: string
+  description: string
+  icon: LucideIcon
+  emptyTitle: string
+  emptyDescription: string
+}) {
+  return (
+    <div className="h-full flex-1 flex-col space-y-8 p-6 md:p-8 md:flex">
+      <div>
+        <h2 className="text-2xl font-bold tracking-tight">{title}</h2>
+        <p className="text-muted-foreground">{description}</p>
+      </div>
+      <EmptyState
+        title={emptyTitle}
+        description={emptyDescription}
+        icon={icon}
+        className="border-none shadow-none"
+      />
+    </div>
+  )
+}