Replace paid_filter with cycle_status_filter that filters based on
membership fee cycle status (last or current cycle). Update
PaymentFilterComponent to use new filter with options All, Paid, Unpaid.
Remove membership fee status filter dropdown. Extend
filter_members_by_cycle_status/3 to support both paid and unpaid filtering.
Update toggle_cycle_view to preserve filter state in URL.
MembershipFeeHelpers: formatting functions for currency, intervals, cycles
MembershipFeeStatus: helper for loading and determining cycle status in member list
