style: remove all top padding on kiosk display

- Changed to px-4 pb-4 pt-0 (zero top padding)
- KPI cards now sit right against navigation bar
- Maximizes vertical screen space for TV display

components/kiosk/cycling-display.tsx

@@ -163,7 +163,7 @@ export function CyclingDisplay({ stats, cycleInterval }: CyclingDisplayProps) {
   const currentKpi = kpis[currentIndex];
 
   return (
-    <div className="flex-1 flex items-center justify-center p-4 pt-2">
+    <div className="flex-1 flex items-center justify-center px-4 pb-4 pt-0">
       <div
         className={`w-full max-w-6xl transition-opacity duration-300 ${
           isTransitioning ? 'opacity-0' : 'opacity-100'