toggle method
Toggles the selection state of a specific item.
This method is typically called when a user taps on an individual checkbox to select or deselect a single item.
Implementation
void toggle(int index, bool value, bool enableHapticFeedback) {
if (index < 0 || index >= _selected.length) return;
_selected[index] = value;
if (enableHapticFeedback) {
HapticFeedback.lightImpact();
}
notifyListeners();
}