Regression coverage for the search input's focus flag: it must track
the renderable's REAL focus (useInputFocusNav FOCUSED/BLURRED), not a
flag that outlives it. Clicking off the input drops inputFocused and
keyboard control resumes; s re-enters typing; Esc defocuses; clicking
the input refocuses.
Documents the observed full-suite CPU-contention flake in the header:
both tests occasionally time out in openSearch under suite load while
passing reliably in isolation.
