<SlideFooter>

Persistent bottom bar.

Name	Type	Default	Description
left?	ReactNode	—	Left section.
center?	ReactNode	—	Center section.
right?	ReactNode	—	Right section.
showSlideNumber?	boolean	false	Append "current / total" on the right.
showDate?	boolean	false	Append today's date on the left.
children?	ReactNode	—	If provided, replaces left/center/right entirely.