✅ - form field with / +/- buttons setting a value ✅ - value is used in a useFibonacci hook ✅ - calculating of the fib number put behind a big timeout to simulate large compute time (say 5 secs)
- show loading state while it is loading
✅ - custom hook that triggers a rerender
✅ - fib number shouldnt be recalculated on rerender