feat: testing mode banner + snapshot storage fields fix

src/app/index.tsx

@@ -5,10 +5,12 @@ import { CustomTheme } from "@shared";
 import { ThemeProvider } from "@mui/material/styles";
 import { ToastContainer } from "react-toastify";
 import { GlobalErrorBoundary } from "./GlobalErrorBoundary";
+import { TestingModeBanner } from "@widgets";
 
 export const App: React.FC = () => (
   <GlobalErrorBoundary>
     <ThemeProvider theme={CustomTheme.Light}>
+      <TestingModeBanner />
       <ToastContainer />
       <Router />
     </ThemeProvider>