Both chained keys()/assertScript() straight off script()'s return
value, which is the evaluated script's result, not the page — so a
snackbar whose dismiss button had just been focused, or whose page
focus had just been reset to <body>, called keys() on null. Splits
each into its own statement, as the FAB menu scroll test in
ActionsTest.php was fixed in the same way.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
