Prefetch the curated Dataset grid on idle (fast tab-switch to Dataset) - #149
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A full page load of /dashboard folds the curated search + 8 thumbnail fetches into the expected page load, but a client-side tab-switch (Overview/Upload -> Dataset) surfaces that same ~720KB fetch as a post-click stall. Warm it on idle after boot so navigating to Dataset from any tab renders from cache.
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Fixes the slow Overview/Upload -> Dataset tab-switch.
Diagnosis: the transition itself is cheap (Dataset/Homepage is in the main bundle, not lazy; the curated search is ~0.5s; all 8 curated thumbnails serve 200 in <60ms). The lag is that a client-side navigation surfaces the curated search + ~720KB of thumbnails as a post-click fetch, whereas a full page load folds the same work into the expected page load.
Fix:
prefetchCurated()warms the exact curated search + thumbnail URLs (viaitemToId, so the cache keys match what Preview requests) onrequestIdleCallbackafter app boot. Runs once per session, swallows all errors. Frontend-only, no backend change.