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.
These member/group/custom-field LiveView tests stay async: false. With the
foreign keys now deferrable the create_member deadlock no longer forces it, so
the rationale is updated: they remain synchronous as a deferred scope decision,
and index_groups_url_params/member_filter_component additionally have separate
async-isolation issues that must be fixed before they can run in parallel.
