Constant BTN_DANGER_OUTLINE 

pub const BTN_DANGER_OUTLINE: &str = "px-4 py-2 text-sm font-medium text-red-600 dark:text-red-400 border border-red-300 dark:border-red-900/50 rounded-full hover:bg-red-50 dark:hover:bg-red-900/20 transition-colors cursor-pointer";

红色描边危险按钮（trash 清空回收站）。