Plan step 32. The full-screen range picker (plan step 24) added a second
`[data-datepicker-headline]` in its app bar, hidden unless the picker is
full screen, so Playwright's strict locator found two headlines in every
modal picker. The tests read the modal header's.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9