Entering a parent's Försäkringskassan balances had no tests at all, despite
being how every number in the planner originates and despite it becoming the
first thing a new user does. The scraper endpoints are pinned per test rather
than read from the ambient configuration, because a local .env sets the flag
opposite to the shipped default and a test that trusts it would pass here and
fail in CI.
Also covered: the hard expiry at twelve, whose rejection path nothing reached
and whose boundary turns out to be inclusive; and the dubbeldagar count cap,
which now drives past the limit and asserts the days beyond it fall back to a
single parent. Two weak assertions were strengthened, including one that
derived its expectation from the same response it was checking and so could
not have failed on a shared error.
