[KPI-01] Implement KPI Tracking Dashboard

[kilip]

Description

Build a KPI tracking dashboard for admins to monitor digital adoption (>70%) and attendance accuracy (>90%).

Subtasks

• KPI-01-ST-01 Implement adoption metric: % of active parishioners registered digitally
• KPI-01-ST-02 Implement attendance accuracy metric: % of attendance records via digital methods (QR/GPS)
• KPI-01-ST-03 Build KPI dashboard UI accessible to super-admin and parish-admin

Acceptance Criteria

• KPI-01-AC-01 Adoption metric calculated correctly against total active parishioner count
• KPI-01-AC-02 Attendance accuracy calculated as digital (QR+GPS) / total attendance records
• KPI-01-AC-03 Dashboard refreshes with up-to-date data

Technical Notes

• Docs: PRD#21-success-metrics-kpis