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)/profile/page.tsx

@@ -9,27 +9,28 @@ import { StudentTodayScheduleCard } from "@/modules/dashboard/components/student
 import { StudentUpcomingAssignmentsCard } from "@/modules/dashboard/components/student-dashboard/student-upcoming-assignments-card"
 import { getStudentDashboardGrades, getStudentHomeworkAssignments } from "@/modules/homework/data-access"
 import { getUserProfile } from "@/modules/users/data-access"
-import { Permissions } from "@/shared/types/permissions"
 import { Badge } from "@/shared/components/ui/badge"
 import { Button } from "@/shared/components/ui/button"
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/shared/components/ui/card"
+import { PageHeader } from "@/shared/components/ui/page-header"
 import { Separator } from "@/shared/components/ui/separator"
+import { formatDate } from "@/shared/lib/utils"
 import { User, Mail, Phone, MapPin, Calendar, Clock, Shield } from "lucide-react"
 
 export const dynamic = "force-dynamic"
 
-const toWeekday = (d: Date): 1 | 2 | 3 | 4 | 5 | 6 | 7 => {
-  const day = d.getDay()
-  return (day === 0 ? 7 : day) as 1 | 2 | 3 | 4 | 5 | 6 | 7
+export const metadata = {
+  title: "Profile",
 }
 
-const formatDate = (date: Date | null) => {
-  if (!date) return "-"
-  return new Intl.DateTimeFormat("en-US", {
-    year: "numeric",
-    month: "long",
-    day: "numeric",
-  }).format(date)
+const WEEKDAY_MAP = [7, 1, 2, 3, 4, 5, 6] as const
+type Weekday = 1 | 2 | 3 | 4 | 5 | 6 | 7
+
+const toWeekday = (d: Date): Weekday => {
+  const day = d.getDay()
+  const result = WEEKDAY_MAP[day]
+  if (result < 1 || result > 7) throw new Error("Invalid weekday")
+  return result
 }
 
 export default async function ProfilePage() {
@@ -42,9 +43,9 @@ export default async function ProfilePage() {
       redirect("/login")
   }
 
-  const permissions = ctx.permissions
-  const isStudent = permissions.includes(Permissions.HOMEWORK_SUBMIT) && !permissions.includes(Permissions.EXAM_CREATE)
-  const isTeacher = permissions.includes(Permissions.EXAM_CREATE)
+  const roles = ctx.roles
+  const isStudent = roles.includes("student")
+  const isTeacher = roles.includes("teacher")
 
   const studentData =
     isStudent
@@ -118,17 +119,15 @@ export default async function ProfilePage() {
 
   return (
     <div className="flex h-full flex-col gap-8 p-8">
-      <div className="flex flex-col justify-between gap-4 md:flex-row md:items-center">
-        <div className="space-y-1">
-          <h1 className="text-3xl font-bold tracking-tight">Profile</h1>
-          <div className="text-sm text-muted-foreground">Manage your personal and account information.</div>
-        </div>
-        <div className="flex items-center gap-2">
+      <PageHeader
+        title="Profile"
+        description="Manage your personal and account information."
+        actions={
           <Button asChild variant="outline">
             <Link href="/settings">Edit Profile</Link>
           </Button>
-        </div>
-      </div>
+        }
+      />
 
       <div className="grid gap-6 md:grid-cols-2">
         <Card>
@@ -205,7 +204,7 @@ export default async function ProfilePage() {
                 <div className="text-sm font-medium text-muted-foreground">Onboarded At</div>
                  <div className="flex items-center gap-2 text-sm">
                    <Clock className="h-3 w-3 text-muted-foreground" />
-                   {formatDate(userProfile.onboardedAt)}
+                   {userProfile.onboardedAt ? formatDate(userProfile.onboardedAt) : "-"}
                 </div>
               </div>
             </div>