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/assignments/[id]/page.tsx

@@ -1,3 +1,4 @@
+import type { JSX } from "react"
 import Link from "next/link"
 import { notFound } from "next/navigation"
 import { getHomeworkAssignmentAnalytics } from "@/modules/homework/data-access"
@@ -10,7 +11,7 @@ import { ChevronLeft, Users, Calendar, BarChart3, CheckCircle2 } from "lucide-re
 
 export const dynamic = "force-dynamic"
 
-export default async function HomeworkAssignmentDetailPage({ params }: { params: Promise<{ id: string }> }) {
+export default async function HomeworkAssignmentDetailPage({ params }: { params: Promise<{ id: string }> }): Promise<JSX.Element> {
   const { id } = await params
   const analytics = await getHomeworkAssignmentAnalytics(id)
 
@@ -23,17 +24,17 @@ export default async function HomeworkAssignmentDetailPage({ params }: { params:
       {/* Header */}
       <div className="border-b bg-background px-8 py-5">
         <div className="flex flex-col gap-4 md:flex-row md:items-start md:justify-between">
-          <div className="flex flex-col gap-2">
+          <div className="min-w-0 flex flex-col gap-2">
             <div className="flex items-center gap-2 text-sm text-muted-foreground mb-1">
               <Link href="/teacher/homework/assignments" className="flex items-center hover:text-foreground transition-colors">
-                <ChevronLeft className="h-4 w-4 mr-1" />
+                <ChevronLeft className="h-4 w-4 mr-1" aria-hidden="true" />
                 Assignments
               </Link>
-              <span>/</span>
+              <span aria-hidden="true">/</span>
               <span>Details</span>
             </div>
             <div className="flex items-center gap-3">
-              <h1 className="text-2xl font-bold tracking-tight text-foreground">{assignment.title}</h1>
+              <h1 className="text-2xl font-bold tracking-tight text-foreground line-clamp-2">{assignment.title}</h1>
               <Badge variant={assignment.status === "published" ? "default" : "secondary"} className="capitalize">
                 {assignment.status}
               </Badge>
@@ -44,7 +45,7 @@ export default async function HomeworkAssignmentDetailPage({ params }: { params:
           <div className="flex items-center gap-3 mt-2 md:mt-0">
             <Button asChild variant="outline" className="shadow-sm">
               <Link href={`/teacher/homework/assignments/${assignment.id}/submissions`}>
-                <Users className="h-4 w-4 mr-2" />
+                <Users className="h-4 w-4 mr-2" aria-hidden="true" />
                 View Submissions
               </Link>
             </Button>
@@ -54,20 +55,20 @@ export default async function HomeworkAssignmentDetailPage({ params }: { params:
         {/* Quick Stats Row */}
         <div className="flex flex-wrap gap-x-8 gap-y-2 mt-6 text-sm">
           <div className="flex items-center gap-2 text-muted-foreground">
-            <Calendar className="h-4 w-4" />
-            <span>Due: <span className="font-medium text-foreground">{assignment.dueAt ? formatDate(assignment.dueAt) : "No due date"}</span></span>
+            <Calendar className="h-4 w-4" aria-hidden="true" />
+            <span>Due: <span className="font-medium text-foreground tabular-nums">{assignment.dueAt ? formatDate(assignment.dueAt) : "No due date"}</span></span>
           </div>
           <div className="flex items-center gap-2 text-muted-foreground">
-            <Users className="h-4 w-4" />
-            <span>Targets: <span className="font-medium text-foreground">{assignment.targetCount}</span></span>
+            <Users className="h-4 w-4" aria-hidden="true" />
+            <span>Targets: <span className="font-medium text-foreground tabular-nums">{assignment.targetCount}</span></span>
           </div>
           <div className="flex items-center gap-2 text-muted-foreground">
-            <CheckCircle2 className="h-4 w-4" />
-            <span>Submissions: <span className="font-medium text-foreground">{assignment.submissionCount}</span></span>
+            <CheckCircle2 className="h-4 w-4" aria-hidden="true" />
+            <span>Submissions: <span className="font-medium text-foreground tabular-nums">{assignment.submissionCount}</span></span>
           </div>
           <div className="flex items-center gap-2 text-muted-foreground">
-            <BarChart3 className="h-4 w-4" />
-            <span>Graded: <span className="font-medium text-foreground">{gradedSampleCount}</span></span>
+            <BarChart3 className="h-4 w-4" aria-hidden="true" />
+            <span>Graded: <span className="font-medium text-foreground tabular-nums">{gradedSampleCount}</span></span>
           </div>
         </div>
       </div>