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/diagnostic/page.tsx

@@ -1,22 +1,37 @@
+import type { JSX } from "react"
 import { getAuthContext } from "@/shared/lib/auth-guard"
+import { getParam, type SearchParams } from "@/shared/lib/search-params"
 import { getDiagnosticReports } from "@/modules/diagnostic/data-access-reports"
 import { ReportList } from "@/modules/diagnostic/components/report-list"
 import type { DiagnosticReportType, DiagnosticReportStatus } from "@/modules/diagnostic/types"
 
 export const dynamic = "force-dynamic"
 
-type SearchParams = { [key: string]: string | string[] | undefined }
+const VALID_REPORT_TYPES: ReadonlySet<string> = new Set([
+  "individual",
+  "class",
+  "grade",
+])
 
-const getParam = (params: SearchParams, key: string) => {
-  const v = params[key]
-  return Array.isArray(v) ? v[0] : v
+const VALID_REPORT_STATUSES: ReadonlySet<string> = new Set([
+  "draft",
+  "published",
+  "archived",
+])
+
+function parseReportType(v?: string): DiagnosticReportType | undefined {
+  return v && VALID_REPORT_TYPES.has(v) ? (v as DiagnosticReportType) : undefined
+}
+
+function parseReportStatus(v?: string): DiagnosticReportStatus | undefined {
+  return v && VALID_REPORT_STATUSES.has(v) ? (v as DiagnosticReportStatus) : undefined
 }
 
 export default async function TeacherDiagnosticPage({
   searchParams,
 }: {
   searchParams: Promise<SearchParams>
-}) {
+}): Promise<JSX.Element> {
   const sp = await searchParams
   const ctx = await getAuthContext()
 
@@ -24,8 +39,8 @@ export default async function TeacherDiagnosticPage({
   const status = getParam(sp, "status")
 
   const reports = await getDiagnosticReports({
-    reportType: reportType && reportType !== "all" ? (reportType as DiagnosticReportType) : undefined,
-    status: status && status !== "all" ? (status as DiagnosticReportStatus) : undefined,
+    reportType: reportType && reportType !== "all" ? parseReportType(reportType) : undefined,
+    status: status && status !== "all" ? parseReportStatus(status) : undefined,
   })
 
   // 学生角色仅查看自己的报告；其他角色查看全部
@@ -37,7 +52,7 @@ export default async function TeacherDiagnosticPage({
   return (
     <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
       <div>
-        <h2 className="text-2xl font-bold tracking-tight">Learning Diagnostic</h2>
+        <h1 className="text-2xl font-bold tracking-tight">Learning Diagnostic</h1>
         <p className="text-muted-foreground">
           View and manage diagnostic reports based on knowledge point mastery.
         </p>