#4748 added a _recordSessionProfileCount() call inside _applySessionListPayload();
the pre-existing #4766 test isolates that function in node and must stub the new
helper (same pattern as the other stubbed helpers) or it ReferenceErrors. Not a
weakened assertion — the test still verifies old+new payload tab-count coverage.
#4741 added redact_enabled= to _sidebar_session_response_item's call site
(routes.py:2199); the pre-existing #4766 test mocked it with a bare 'lambda row: row'
that rejects the kwarg -> full-suite TypeError. Mock now accepts the keyword-only
arg. Not a weakened assertion — the test still asserts bucket-count omission.
TARS