test: optimize single test and update docs

test/mv_web/member_live/index_member_fields_display_test.exs

@@ -56,7 +56,9 @@ defmodule MvWeb.MemberLive.IndexMemberFieldsDisplayTest do
       })
 
     conn = conn_with_oidc_user(conn)
-    {:ok, _view, html} = live(conn, "/members")
+    # Use search query to filter to only the expected member (Alice)
+    # This significantly improves test performance by avoiding loading all members from other tests
+    {:ok, _view, html} = live(conn, "/members?query=Alice")
 
     assert html =~ "Email"
     assert html =~ m.email