Build a Counter
Build a counter component. The buttons are already on screen — make them work.
Requirements
- +1 and -1 change the displayed count.
- The count never goes below zero: -1 is disabled at 0.
- Reset returns the count to 0.
Talk through where the state lives and why the disabled state should be derived from it rather than stored separately.
Hints
Hint 1
One useState(0) is the only state this needs — everything else on screen is derived from it.
Hint 2
Disable with disabled={count === 0} instead of tracking a second boolean; two sources of truth drift.