refactor: extract NativeSelectIcon into its own component

Move the chevron icon from an inline private method in NativeSelect
into a dedicated NativeSelectIcon component, following the same
pattern as AccordionIcon. Supports block override for custom icons.

Author: djalmaaraujo

lib/ruby_ui/native_select/native_select.rb

@@ -12,28 +12,12 @@ def view_template(&block)
         class: "group/native-select relative w-fit has-[select:disabled]:opacity-50"
       ) do
         select(**attrs, &block)
-        chevron_icon
+        render RubyUI::NativeSelectIcon.new
       end
     end
 
     private
 
-    def chevron_icon
-      svg(
-        xmlns: "http://www.w3.org/2000/svg",
-        viewbox: "0 0 24 24",
-        fill: "none",
-        stroke: "currentColor",
-        stroke_width: "2",
-        stroke_linecap: "round",
-        stroke_linejoin: "round",
-        class: "text-muted-foreground pointer-events-none absolute top-1/2 right-2.5 size-4 -translate-y-1/2 select-none",
-        aria_hidden: "true"
-      ) do |s|
-        s.path(d: "m6 9 6 6 6-6")
-      end
-    end
-
     def default_attrs
       {
         data: {

lib/ruby_ui/native_select/native_select_icon.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+module RubyUI
+  class NativeSelectIcon < Base
+    def view_template(&block)
+      span(**attrs) do
+        if block
+          block.call
+        else
+          icon
+        end
+      end
+    end
+
+    private
+
+    def icon
+      svg(
+        xmlns: "http://www.w3.org/2000/svg",
+        viewbox: "0 0 24 24",
+        fill: "none",
+        stroke: "currentColor",
+        stroke_width: "2",
+        stroke_linecap: "round",
+        stroke_linejoin: "round",
+        class: "size-4",
+        aria_hidden: "true"
+      ) do |s|
+        s.path(d: "m6 9 6 6 6-6")
+      end
+    end
+
+    def default_attrs
+      {
+        class: "text-muted-foreground pointer-events-none absolute top-1/2 right-2.5 -translate-y-1/2 select-none"
+      }
+    end
+  end
+end

test/ruby_ui/native_select_test.rb

@@ -16,6 +16,7 @@ def test_render_with_options
     assert_match(/Apple/, output)
     assert_match(/Banana/, output)
     assert_match(/<select/, output)
+    assert_match(/<svg/, output)
   end
 
   def test_render_with_groups