fix(ui/portal/schedule): button text unreadable on hover

Author: MFarabi619

libs/shared/ui/button/button.tsx

@@ -10,7 +10,7 @@ const buttonVariants = cva(
     variants: {
       variant: {
         default:
-          'shadow-buttonKeyboard bg-g-keyboardBlack text-primary hover:bg-primary/90 hover:shadow-buttonKeyboardHover',
+          'shadow-buttonKeyboard bg-g-keyboardBlack text-primary hover:text-background hover:bg-primary/90 hover:shadow-buttonKeyboardHover',
         destructive:
           'bg-destructive text-destructive-foreground hover:bg-destructive/90',
         outline: