pub const BTN_ICON: &str = "w-9 h-9 flex items-center justify-center text-sm text-paper-secondary hover:text-paper-primary hover:bg-paper-theme cursor-pointer transition-colors focus:outline-none focus-visible:ring-2 focus-visible:ring-paper-accent/40";Expand description
方形图标按钮（trash 步进 −/+）。