add icon button

crates/core/src/button.rs

@@ -134,6 +134,7 @@ impl RenderOnce for Button {
 
         let on_click = self.on_click;
         let a11y_label = self.a11y_label.or_else(|| self.label.clone());
+        let icon_only = self.label.is_none() && self.icon.is_some();
 
         let (background, foreground, hover, pressed) = match self.variant {
             ButtonVariant::Primary => (
@@ -166,8 +167,10 @@ impl RenderOnce for Button {
             .id(self.id)
             .role(Role::Button)
             .justify_center()
-            .h(metrics.control_height)
-            .px(metrics.padding_x)
+            .when(icon_only, |button| button.size(metrics.control_height))
+            .when(!icon_only, |button| {
+                button.h(metrics.control_height).px(metrics.padding_x)
+            })
             .line_height(relative(1.0))
             .gap_1p5()
             .rounded(theme.radius.control)