1. Payment void now reverts entity status: added payment.voided listener that
   sets dependents back to pending_payment (or reverts member to payment_pending
   if membership payment is voided with no other valid payment)
2. Added join_date column to children and temporary_members tables (migration),
   set on activation. Display in family tree tables.
3. Removed stepchild (ابن/ابنة الزوج) from children relationship dropdown
4. Form fee (570) now includes annual subscription on post-activation additions
   (restored bcadd with getAnnualSubscriptionForAddition)
5. Added join_date to Child and TemporaryMember model fillables
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>