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* refactor(voice): load STT availability through React Query useSpeechToText fetched `/api/settings/voice` inside an effect and stored the result in useState behind a hand-rolled mountedRef guard: no cache, no dedupe across mounts, and no AbortSignal, so the response was fetched and parsed even after unmount. Two simultaneously mounted consumers issued two requests. It also bypassed hooks/queries/**, which is where every other server read in the app lives — and it escaped `check:react-query`, whose audit only covers useQuery/useMutation call sites. The value is server env read at request time, so it cannot change within a session; the new hook uses an infinite staleTime and a caller-controlled `enabled` so clients without the audio APIs never issue the request. Hydration is unchanged: SSR renders unavailable, and the first client render still resolves unavailable because `data` is undefined until the fetch settles. No initialData, deliberately — adding it would break that. mountedRef stays; it is still load-bearing for the streaming lifecycle. * test(queries): unmount rendered roots between tests renderHookWithClient created a React root per test but never tore it down, so trees stayed mounted with live QueryClient observers until worker teardown and async notifications could cross test boundaries. Audited every test in the repo using createRoot: 51 of 53 already unmount. The two that did not were both mine — voice.test.tsx here and chats.test.tsx from #6223 — so both are fixed and the pattern is now uniform. * fix(voice): let a failed STT probe recover on a later mount The app QueryClient sets retryOnMount: false and retry: 1, and refetchOnWindowFocus only refetches stale queries — which an infinite staleTime never becomes. So one transient failure cached the error for the life of the client and hid the mic until a full page reload. The effect this replaced refetched on every run, so retryOnMount: true restores parity: no refetch after success, a retry per mount after failure. Test asserts recovery under the app's real query defaults and fails without the override.