fix(member-export): split composite Name and Address into component columns on export

test/mv_web/live/member_live/index/export_payload_test.exs

@@ -83,5 +83,59 @@ defmodule MvWeb.MemberLive.Index.ExportPayloadTest do
       assert payload.cycle_status_filter == nil
       assert payload.boolean_filters == %{}
     end
+
+    test "expands visible composite Name/Address cells into their constituent db columns" do
+      # Compact mode: the composite :name / :address cells are visible and their
+      # constituent columns are hidden from member_fields_visible_db. The export
+      # must still carry name and address, split into their db components.
+      assigns = %{
+        selected_members: MapSet.new(),
+        member_fields_visible_db: [:join_date],
+        member_fields_visible_computed: [],
+        member_fields_visible: [:name, :address, :join_date],
+        member_include_email: true,
+        visible_custom_field_ids: [],
+        all_custom_fields: []
+      }
+
+      payload = ExportPayload.build(assigns)
+
+      # Constituents are emitted in Mv.Constants.member_fields/0 order, interleaved
+      # with the ordinary visible db field (join_date sits between the name and
+      # address groups per constants order).
+      assert payload.column_order == [
+               "first_name",
+               "last_name",
+               "email",
+               "join_date",
+               "city",
+               "street",
+               "house_number",
+               "postal_code"
+             ]
+
+      # The composite pseudo-columns themselves are never exported.
+      refute "name" in payload.member_fields
+      refute "address" in payload.member_fields
+    end
+
+    test "omits email from the Name composite expansion when it is not folded into the cell" do
+      # include_email off: email is its own column (exported only if separately
+      # visible), so the Name composite expands to first/last name only.
+      assigns = %{
+        selected_members: MapSet.new(),
+        member_fields_visible_db: [:join_date],
+        member_fields_visible_computed: [],
+        member_fields_visible: [:name, :join_date],
+        member_include_email: false,
+        visible_custom_field_ids: [],
+        all_custom_fields: []
+      }
+
+      payload = ExportPayload.build(assigns)
+
+      assert payload.column_order == ["first_name", "last_name", "join_date"]
+      refute "email" in payload.column_order
+    end
   end
 end