Swaps the unbounded vertical filter panel for a Polaris-style add-filter
builder (searchable grouped field picker, type-aware value control, applied
chips) and colour-codes the fees column with each member's period-scoped
unpaid-cycle count.
Counts each member's unpaid billing cycles that fall inside the selected
period. Cycle boundaries are member-relative — derived from each member's
fee-type interval — so "the current cycle" spans different calendar dates
per member.
