E2E tests were failing because the dev login selector redirects to
/login when AUTH_DISABLED=true and no dev user is in localStorage.
Added a shared Playwright fixture that pre-seeds localStorage with
a default dev user before each test.
Also rebased onto latest main to resolve merge conflict in App.test.tsx.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
Groom Book CTO