fix(题目页): 统计页签的老师版回到讲这道题本身，各班只列一张表，不选班、不列人名

按人看谁没做对是提交页「数据统计」的活；表里点一个班就去那边看。

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/web/src/utils/types.ts

@@ -81,7 +81,7 @@ export type ProblemStatus = "passed" | "failed" | "not_test"
  * shared/api.ts 原来还得用 `Tag & { problemCount: number }` 把它补回来。
  */
 export type { Tag, TagCategory } from "@oj2/contract"
-export type { ProblemStats, ProblemClassDetail } from "@oj2/contract"
+export type { ProblemStats } from "@oj2/contract"
 export type { TodaySubmissionStatistics } from "@oj2/contract"
 
 export type {