Streaks and Engagement Metrics Visible to Admin

[ankit2101]

Summary

In the admin Progress tab, show each student's current streak, longest streak, and days since last login alongside their test scores.

Why

Teachers cite 'identifying disengaged students early' as a top need. Streak data is a leading indicator of disengagement — a broken streak predicts academic fallback before score data does.

Implementation Notes

• Add current_streak, longest_streak, last_login_date to Student model
• Updated on every student login
• New columns in admin Students tab: Streak, Last Active
• Highlight students with streak = 0 and last active > 7 days in amber

Acceptance Criteria

• Admin Students tab shows current streak and last active date per student
• Students inactive >7 days are highlighted
• Streak data shown in admin Progress view alongside scores