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/announcements/components/announcement-card.tsx

@@ -1,7 +1,6 @@
 "use client"
 
 import Link from "next/link"
-import { useMemo } from "react"
 import { Badge } from "@/shared/components/ui/badge"
 import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui/card"
 import { formatDate } from "@/shared/lib/utils"
@@ -35,36 +34,33 @@ export function AnnouncementCard({
   announcement: Announcement
   href?: string
 }) {
-  const card = useMemo(
-    () => (
-      <Card className="h-full transition-colors hover:bg-accent/50">
-        <CardHeader className="flex flex-row items-start justify-between gap-2 space-y-0">
-          <CardTitle className="line-clamp-2 text-base">{announcement.title}</CardTitle>
-          <Badge variant={STATUS_VARIANT[announcement.status]} className="shrink-0">
-            {STATUS_LABEL[announcement.status]}
+  const card = (
+    <Card className="h-full transition-colors hover:bg-accent/50">
+      <CardHeader className="flex flex-row items-start justify-between gap-2 space-y-0">
+        <CardTitle className="line-clamp-2 text-base">{announcement.title}</CardTitle>
+        <Badge variant={STATUS_VARIANT[announcement.status]} className="shrink-0">
+          {STATUS_LABEL[announcement.status]}
+        </Badge>
+      </CardHeader>
+      <CardContent className="space-y-2">
+        <p className="line-clamp-3 text-sm text-muted-foreground whitespace-pre-wrap">
+          {announcement.content}
+        </p>
+        <div className="flex flex-wrap items-center gap-2 text-xs text-muted-foreground">
+          <Badge variant="outline" className="capitalize">
+            {TYPE_LABEL[announcement.type]}
           </Badge>
-        </CardHeader>
-        <CardContent className="space-y-2">
-          <p className="line-clamp-3 text-sm text-muted-foreground whitespace-pre-wrap">
-            {announcement.content}
-          </p>
-          <div className="flex flex-wrap items-center gap-2 text-xs text-muted-foreground">
-            <Badge variant="outline" className="capitalize">
-              {TYPE_LABEL[announcement.type]}
-            </Badge>
-            <span>
-              {announcement.publishedAt
-                ? `Published ${formatDate(announcement.publishedAt)}`
-                : `Updated ${formatDate(announcement.updatedAt)}`}
-            </span>
-            {announcement.authorName ? (
-              <span className="ml-auto">by {announcement.authorName}</span>
-            ) : null}
-          </div>
-        </CardContent>
-      </Card>
-    ),
-    [announcement]
+          <span>
+            {announcement.publishedAt
+              ? `Published ${formatDate(announcement.publishedAt)}`
+              : `Updated ${formatDate(announcement.updatedAt)}`}
+          </span>
+          {announcement.authorName ? (
+            <span className="ml-auto">by {announcement.authorName}</span>
+          ) : null}
+        </div>
+      </CardContent>
+    </Card>
   )
 
   if (href) {