fix: improve get_last_completed_cycle and fix test helpers

- Fix get_last_completed_cycle to find most recent completed cycle
- Fix create_cycle helpers to delete auto-generated cycles first
- Fix Ash.destroy return value handling
- Fix form selectors to use specific IDs
- Fix URL parameter names for filters
- Fix Ash.read_one return value expectations in tests

lib/membership/member.ex

@@ -102,6 +102,9 @@ defmodule Mv.Membership.Member do
         where [changing(:user)]
       end
 
+      # Auto-assign default membership fee type if not explicitly set
+      change Mv.Membership.Member.Changes.SetDefaultMembershipFeeType
+
       # Auto-calculate membership_fee_start_date if not manually set
       # Requires both join_date and membership_fee_type_id to be present
       change Mv.MembershipFees.Changes.SetMembershipFeeStartDate