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/app/(dashboard)/teacher/questions/page.tsx

@@ -1,3 +1,4 @@
+import type { JSX } from "react"
 import { Suspense } from "react"
 import { ClipboardList } from "lucide-react"
 
@@ -8,16 +9,24 @@ import { CreateQuestionButton } from "@/modules/questions/components/create-ques
 import { EmptyState } from "@/shared/components/ui/empty-state"
 import { Skeleton } from "@/shared/components/ui/skeleton"
 import { getQuestions } from "@/modules/questions/data-access"
+import { getParam, type SearchParams } from "@/shared/lib/search-params"
 import type { QuestionType } from "@/modules/questions/types"
 
-type SearchParams = { [key: string]: string | string[] | undefined }
+export const dynamic = "force-dynamic"
 
-const getParam = (params: SearchParams, key: string) => {
-  const v = params[key]
-  return Array.isArray(v) ? v[0] : v
+const VALID_QUESTION_TYPES: ReadonlySet<string> = new Set([
+  "single_choice",
+  "multiple_choice",
+  "text",
+  "judgment",
+  "composite",
+])
+
+function parseQuestionType(v?: string): QuestionType | undefined {
+  return v && VALID_QUESTION_TYPES.has(v) ? (v as QuestionType) : undefined
 }
 
-async function QuestionBankResults({ searchParams }: { searchParams: Promise<SearchParams> }) {
+async function QuestionBankResults({ searchParams }: { searchParams: Promise<SearchParams> }): Promise<JSX.Element> {
   const params = await searchParams
 
   const q = getParam(params, "q")
@@ -25,14 +34,7 @@ async function QuestionBankResults({ searchParams }: { searchParams: Promise<Sea
   const difficulty = getParam(params, "difficulty")
   const knowledgePointId = getParam(params, "kp")
 
-  const questionType: QuestionType | undefined =
-    type === "single_choice" ||
-    type === "multiple_choice" ||
-    type === "text" ||
-    type === "judgment" ||
-    type === "composite"
-      ? type
-      : undefined
+  const questionType = parseQuestionType(type)
 
   const { data: questions } = await getQuestions({
     q: q || undefined,
@@ -91,12 +93,12 @@ export default async function QuestionBankPage({
   searchParams,
 }: {
   searchParams: Promise<SearchParams>
-}) {
+}): Promise<JSX.Element> {
   return (
     <div className="flex h-full flex-col space-y-8 p-8">
       <div className="flex flex-col justify-between space-y-4 md:flex-row md:items-center md:space-y-0">
         <div>
-          <h2 className="text-2xl font-bold tracking-tight">Question Bank</h2>
+          <h1 className="text-2xl font-bold tracking-tight">Question Bank</h1>
           <p className="text-muted-foreground">
             Manage your question repository for exams and assignments.
           </p>