- Group view: added KPI cards for paid/unpaid/free player counts
- Group view: added essential product purchase stats with progress bars
- Group view: added installment info column per player in enrollments tab
- Fixed PHP 8.2+ trait property conflict: removed $sortBy/$sortDir
  redeclarations from 13 Livewire components that use WithSorting trait,
  moved custom defaults to mount() instead
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>