Prestige Barber Club v4.40.3 Build Test

Scope:
- Pra-Member membership validity snapshot (months)
- Expiry = join_date + membership_validity_months
- Filters: validity months, expiry status, expiry date range
- Sort: nearest/farthest expiry
- Expiry status badges and remaining/overdue days
- XLSX template optional membership_validity_months column
- Approval preserves historical join date and expiry

Validation performed:
- Full PHP lint: 187 PHP files, 0 syntax errors
- XLSX template parsed by application SimpleXlsx parser: 14 columns; membership_validity_months recognized; sample 12
- Historical calculation check: 2022-09-14 + 12 months = 2023-09-14
- Static schema/SQL relation audit
- ZIP integrity test before release

Limitation:
- No live production MySQL/browser integration test was executed in this environment.