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/homework/submissions/[submissionId]/page.tsx

@@ -1,3 +1,4 @@
+import type { JSX } from "react"
 import { notFound } from "next/navigation"
 import { getHomeworkSubmissionDetails } from "@/modules/homework/data-access"
 import { HomeworkGradingView } from "@/modules/homework/components/homework-grading-view"
@@ -5,7 +6,7 @@ import { formatDate } from "@/shared/lib/utils"
 
 export const dynamic = "force-dynamic"
 
-export default async function HomeworkSubmissionGradingPage({ params }: { params: Promise<{ submissionId: string }> }) {
+export default async function HomeworkSubmissionGradingPage({ params }: { params: Promise<{ submissionId: string }> }): Promise<JSX.Element> {
   const { submissionId } = await params
   const submission = await getHomeworkSubmissionDetails(submissionId)
 
@@ -14,15 +15,15 @@ export default async function HomeworkSubmissionGradingPage({ params }: { params
   return (
     <div className="flex h-full flex-col space-y-4 p-6">
       <div className="flex items-center justify-between">
-        <div>
-          <h2 className="text-2xl font-bold tracking-tight">{submission.assignmentTitle}</h2>
+        <div className="min-w-0">
+          <h1 className="text-2xl font-bold tracking-tight line-clamp-2">{submission.assignmentTitle}</h1>
           <div className="flex items-center gap-4 text-sm text-muted-foreground mt-1">
             <span>
               Student: <span className="font-medium text-foreground">{submission.studentName}</span>
             </span>
-            <span>•</span>
-            <span>Submitted: {submission.submittedAt ? formatDate(submission.submittedAt) : "-"}</span>
-            <span>•</span>
+            <span aria-hidden="true">•</span>
+            <span className="tabular-nums">Submitted: {submission.submittedAt ? formatDate(submission.submittedAt) : "-"}</span>
+            <span aria-hidden="true">•</span>
             <span className="capitalize">Status: {submission.status}</span>
           </div>
         </div>