Prestige Barber Club v4.39.2 Build Test

Feature:
- Pra-Member active duration until today.
- Active date range filters.
- Min/max day filters.
- Quick duration buckets.
- Sort by age/newest/oldest.
- Pending age summary cards.

Compatibility:
- No destructive database migration.
- Existing join_date used; created_at is fallback.
- Upgrade v4.39.2 only advances schema release marker.
