Bug 1: Attendance threshold was counting 'expected' records in the
denominator, causing any player with future sessions to have a low
attendance rate and get auto-suspended. Fixed by excluding 'expected'
status from rate calculation and requiring minimum 5 evaluated records
before triggering threshold enforcement.

Bug 2: Registration wizard and POS receipt always showed full amount
as "paid" even for partial/deposit payments. Fixed to show actual
paid_amount and due_amount from the invoice, with distinct badge for
partial payment state.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>