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/modules/messaging/components/notification-list.tsx

@@ -10,10 +10,10 @@ import { Badge } from "@/shared/components/ui/badge"
 import { Button } from "@/shared/components/ui/button"
 import { Card, CardContent } from "@/shared/components/ui/card"
 import { EmptyState } from "@/shared/components/ui/empty-state"
-import { formatDate } from "@/shared/lib/utils"
+import { cn, formatDate } from "@/shared/lib/utils"
 
 import { markAllNotificationsAsReadAction, markNotificationAsReadAction } from "../actions"
-import type { Notification, NotificationType } from "../types"
+import type { Notification, NotificationType } from "@/modules/notifications/types"
 
 const TYPE_ICON: Record<NotificationType, typeof Bell> = {
   message: MessageSquare,
@@ -91,7 +91,7 @@ export function NotificationList({ notifications }: { notifications: Notificatio
             return (
               <Card
                 key={n.id}
-                className={`transition-colors ${!n.isRead ? "border-primary/40 bg-primary/5" : ""}`}
+                className={cn("transition-colors", !n.isRead && "border-primary/40 bg-primary/5")}
               >
                 <CardContent className="flex items-start gap-3 py-4">
                   <div className="bg-muted flex size-9 shrink-0 items-center justify-center rounded-full">
@@ -99,7 +99,7 @@ export function NotificationList({ notifications }: { notifications: Notificatio
                   </div>
                   <div className="min-w-0 flex-1 space-y-1">
                     <div className="flex items-center gap-2">
-                      <span className={`text-sm ${!n.isRead ? "font-semibold" : "font-medium"}`}>
+                      <span className={cn("text-sm", !n.isRead ? "font-semibold" : "font-medium")}>
                         {n.title}
                       </span>
                       {!n.isRead ? <Badge variant="default" className="text-xs">New</Badge> : null}