Sort logic into render, event, ref, or Effect

Sort each logic example into the correct React home. Render calculation Event handler Ref Effect Calculate visibleRows from rows and query Compute totalPrice from cart items Show a toast after the user clicks Save and the request succeeds Send a form POST because the user submitted the form Hold a timeout ID so it can be cleared later without rendering Hold an input DOM node for focus Subscribe to a window resize event and clean it up Connect a chat socket when roomId changes and disconnect on cleanup

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