wgui: use dark mode

wlx-overlay-s/src/assets/gui/bar.xml

@@ -22,8 +22,7 @@
       <rectangle padding="8" gap="8" round="100%" color="~bg_color_active" justify_content="center" align_items="center">
         <label size="18" translation="BAR.OPACITY" color="~text_color" />
         <Slider width="150" height="24" min_value="0" max_value="100" value="100" />
-        <label size="18" translation="BAR.ADDITIVE" color="~text_color" />
-        <sprite color="~device_color" width="20" height="20" src="bar/checkbox-checked.svg" />
+        <CheckBox translation="BAR.ADDITIVE" color="~text_color" />
       </rectangle>
     </div>
   </elements>

wlx-overlay-s/src/state.rs

@@ -1,7 +1,7 @@
 use glam::Affine3A;
 use idmap::IdMap;
 use serde::{Deserialize, Serialize};
-use smallvec::{smallvec, SmallVec};
+use smallvec::{SmallVec, smallvec};
 use std::sync::Arc;
 use wgui::{
     gfx::WGfx, globals::WguiGlobals, renderer_vk::context::SharedContext as WSharedContext,
@@ -97,6 +97,7 @@ impl AppState {
             wgui_globals: WguiGlobals::new(
                 Box::new(gui::asset::GuiAsset {}),
                 wgui::globals::Defaults {
+                    dark_mode: true,
                     text_color: wgui::drawing::Color::new(1.0, 1.0, 1.0, 1.0),
                 },
             )?,