useTransition Hook
startTransition marks state updates as non-urgent: React renders them concurrently in the background, keeps the current UI interactive, and abandons the in-progress render if newer urgent input arrives; isPending reports the in-flight status. Urgent updates (typing, clicks) always win over transition updates, which is how large re-renders stop blocking input.
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startTransition marks state updates as non-urgent: React renders them concurrently in the background, keeps the current UI interactive, and abandons the in-progress render if newer urgent input arrives; isPending reports the in-flight status. Urgent updates (typing, clicks) always win over transition updates, which is how large re-renders stop blocking input.
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