ui: window resize, update egui (waiting for window dragging/resizing patch), pull to refresh widget, colors optimization, min window size, root panels switch optimization

src/lib.rs

@@ -112,7 +112,7 @@ pub fn app_creator<T: 'static>(app: App<T>) -> eframe::AppCreator
         // Setup fonts.
         setup_fonts(&cc.egui_ctx);
         // Return app instance.
-        Box::new(app)
+        Ok(Box::new(app))
     })
 }