fix(tests): migrate leftover ext/ substring patterns the URL sweep missed
Two test files had getWindow substring matchers still looking for
'ext/X/' paths that no longer exist after the URL migration:
- localsearch.spec.ts (5 occurrences) — was not in the sweep list
because the file name is 'localsearch' but the feature is 'lists'.
Agent missed the mapping.
- groups-context.spec.ts:343 — one stray getWindow for the HUD
window that slipped past.
Both trivially fixed by dropping the 'ext/' prefix from the
substring. Verified Lists Extension 7/7 passing.