(SP: 3) [Frontend] Admin quiz statistics dashboard #340
Description
Goal:
Admin dashboard with quiz analytics at /admin/quiz/statistics.
Scope:
- Total attempts (daily/weekly/monthly trends)
- Average scores by quiz and category
- Most popular quizzes
- Completion rates
- Anti-cheat violation statistics
- Period and category filters
Expected impact:
- Data-driven decisions on quiz content
Out of scope:
- Quiz editing (Issue 1)
- Quiz creation (Issue 2)