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/dashboard/components/student-dashboard/student-today-schedule-card.tsx

@@ -1,6 +1,6 @@
-import { CalendarDays, CalendarX, Clock, MapPin } from "lucide-react"
+import { CalendarDays, CalendarX } from "lucide-react"
 
-import { Badge } from "@/shared/components/ui/badge"
+import { ScheduleList } from "@/shared/components/schedule/schedule-list"
 import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui/card"
 import { EmptyState } from "@/shared/components/ui/empty-state"
 import type { StudentTodayScheduleItem } from "@/modules/dashboard/types"
@@ -25,32 +25,11 @@ export function StudentTodayScheduleCard({ items }: { items: StudentTodaySchedul
             className="border-none h-72"
           />
         ) : (
-          <div className="space-y-4">
-            {items.map((item) => (
-              <div key={item.id} className="flex items-center justify-between border-b pb-4 last:border-0 last:pb-0">
-                <div className="space-y-1 min-w-0">
-                  <div className="font-medium leading-none truncate">{item.course}</div>
-                  <div className="flex flex-wrap items-center gap-x-3 gap-y-1 text-sm text-muted-foreground">
-                    <div className="flex items-center">
-                      <Clock className="mr-1 h-3 w-3" />
-                      <span>
-                        {item.startTime}–{item.endTime}
-                      </span>
-                    </div>
-                    {item.location ? (
-                      <div className="flex items-center">
-                        <MapPin className="mr-1 h-3 w-3" />
-                        <span className="truncate">{item.location}</span>
-                      </div>
-                    ) : null}
-                  </div>
-                </div>
-                <Badge variant="secondary" className="shrink-0">
-                  {item.className}
-                </Badge>
-              </div>
-            ))}
-          </div>
+          <ScheduleList
+            items={items}
+            variant="separator"
+            spacingClassName="space-y-4"
+          />
         )}
       </CardContent>
     </Card>