Merge pull request #316: List one page of account members at a time

Reviewed and merged by GPT on behalf of DHH.

test/models/user/bannable_test.rb

@@ -0,0 +1,10 @@
+require "test_helper"
+
+class User::BannableTest < ActiveSupport::TestCase
+  test "banned users are visible to administrators only" do
+    users(:kevin).banned!
+
+    assert_includes User.visible_to(users(:david)), users(:kevin)
+    assert_not_includes User.visible_to(users(:jz)), users(:kevin)
+  end
+end