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Refresh an already-rendered stateful application view in place instead of rebuilding it from empty. Use when a view the user is already looking at is re-fetched because of app or window activation, focus or visibility change, reconnect, polling, a manual refresh control, mutation success, or a change in which resource the view shows, and when deciding what to keep, what to replace, and what to ask about. Not for first load, form save semantics, data-fetching library choice, or server-side cache revalidation.