style: make page headers sticky and improve table header contrast/visibility

adminfront/src/components/ui/table.tsx

@@ -69,7 +69,7 @@ const TableHead = React.forwardRef<
   <th
     ref={ref}
     className={cn(
-      "h-12 px-6 text-left text-xs font-bold uppercase tracking-[0.08em] text-muted-foreground align-middle",
+      "h-12 px-6 text-left text-xs font-bold uppercase tracking-[0.08em] text-foreground align-middle",
       className,
     )}
     {...props}