chore: Another round of style lints fixes (#17519)

Closes #ISSUE

Release Notes:

- N/A

crates/ui/src/components/button.rs

@@ -1,5 +1,5 @@
 mod button;
-pub(self) mod button_icon;
+mod button_icon;
 mod button_like;
 mod icon_button;
 mod toggle_button;

crates/ui/src/components/list/list.rs

@@ -13,6 +13,12 @@ pub struct List {
     children: SmallVec<[AnyElement; 2]>,
 }
 
+impl Default for List {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl List {
     pub fn new() -> Self {
         Self {