Phase 5 Task 5.8 (PartiesGrid) and 5.9 (ValidationPanel) added useDrillStack()
calls, so Claims.test.tsx needs a DrillStackProvider wrapper around the
page render to keep the hook happy. Task 5.10 refactored the ClaimDrawer
header onto the shared DrillDrawerHeader, so the deep-link and close-button
tests need to find the title via <h2> and the close button via
aria-label='Close drawer' instead of the now-removed header-id /
header-close testids.
Without this fix the page-level Claims tests report 3 failures
(deep link, URL clear after close, ?-mark with drawer closed) that
were not failing on the Phase 4 base (9a313d2).
Tyler