- Fix response time bug: exclude pause duration from calculations
- Add global per-kid stats tracking with new DB columns
- Create SkillPerformanceReports component for dashboard
- Add PracticeTimingDisplay with live problem timer and speed meter
- Extract SpeedMeter to shared component
- Add defensive handling for empty JSON in abacus-settings API
New features:
- Live timer showing elapsed time on current problem
- Speed visualization bar showing position vs average
- Per-part-type timing breakdown (abacus/visualize/linear)
- Skill performance analysis on dashboard (fast/slow/weak skills)
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Co-Authored-By: Claude <noreply@anthropic.com>
Thomas Hallock