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perf(react-router): fewer hooks per Link A Link render ran about 25 hook slots. React allocates a hook object per slot per render, plus a deps array for every memo, callback and effect, so the slots set both the re-render cost and the retained fiber memory of a mounted Link. Five of them did not need to exist: - The three `useValueStable` refs for `search`, `params` and `activeOptions` become one `useStableValues` ref that replaces each entry only when its own contents change, so identities behave exactly as before. - `_options` and its `dest` copy come out of one memo instead of two. - `doPreload` is a module function, `preloadLink(router, options)`; the callback existed only to give the effects a stable identity. - The IntersectionObserver effect and the render-preload effect merge into one preload effect whose cleanup also cancels a pending intent timer, as the observer hook's cleanup did. `useIntersectionObserver` had no other consumer and is removed. `hasRenderFetched` stays: without it a link with an updater-function `search` would preload on every render. Measurements (macOS arm64, Node 24.8.0, local, 200 mounted Links): - retained heap per mounted app 2949 -> 2782 KB (-6%, about -0.8 KB per Link) - mount (router creation + first render) median 2.05 -> 1.90 ms - Link client paired runner (4 repeats): shared-params CPU -3.0% [-5.3, -0.6], active -3.3% [-8.4, 2.1] - react-router.minimal gzip 85984 -> 85968 (-16) Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

nx affected --targets=test:eslint,test:unit,test:e2e,test:types,test:build,build --parallel=3

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routerWorkspace