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/lesson-preparation/components/lesson-plan-card.tsx

@@ -0,0 +1,58 @@
+"use client";
+
+import Link from "next/link";
+import { Button } from "@/shared/components/ui/button";
+import { LESSON_PLAN_STATUS_LABELS } from "../constants";
+import { duplicateLessonPlanAction, deleteLessonPlanAction } from "../actions";
+import type { LessonPlanListItem } from "../types";
+
+export function LessonPlanCard({ plan }: { plan: LessonPlanListItem }) {
+  return (
+    <div className="border border-outline-variant rounded-lg p-4 bg-surface-container-lowest hover:shadow-md transition-shadow">
+      <Link
+        href={`/teacher/lesson-plans/${plan.id}/edit`}
+        className="block"
+      >
+        <h3 className="font-title-md text-title-md hover:text-primary">
+          {plan.title}
+        </h3>
+      </Link>
+      <div className="text-sm text-on-surface-variant mt-1">
+        {plan.textbookTitle ?? "无教材"} · {plan.chapterTitle ?? "无章节"}
+      </div>
+      <div className="text-xs text-on-surface-variant mt-1">
+        {plan.templateName ?? "无模板"} ·{" "}
+        {LESSON_PLAN_STATUS_LABELS[plan.status]}
+      </div>
+      <div className="text-xs text-on-surface-variant mt-2">
+        最后保存：
+        {plan.lastSavedAt
+          ? new Date(plan.lastSavedAt).toLocaleString()
+          : "未保存"}
+      </div>
+      <div className="flex gap-2 mt-3">
+        <Button
+          variant="outline"
+          size="sm"
+          onClick={async () => {
+            const res = await duplicateLessonPlanAction(plan.id);
+            if (res.success) window.location.reload();
+          }}
+        >
+          复制
+        </Button>
+        <Button
+          variant="outline"
+          size="sm"
+          onClick={async () => {
+            if (!confirm("确认归档此课案？")) return;
+            const res = await deleteLessonPlanAction(plan.id);
+            if (res.success) window.location.reload();
+          }}
+        >
+          归档
+        </Button>
+      </div>
+    </div>
+  );
+}