docs(theme): reminder to sync icon and GUI color-schemes

src/gui/mod.rs

@@ -381,6 +381,7 @@ impl Application for UadGui {
 impl UadGui {
     pub fn start() -> iced::Result {
         let logo: &[u8] = match *OS_COLOR_SCHEME {
+            // remember to keep `Default` in sync with `src/core/theme`
             dark_light::Mode::Dark | dark_light::Mode::Default => {
                 include_bytes!("../../resources/assets/logo-dark.png")
             }