fix: use harmony-ui toast and update gitignore to ignore .npmrc

src/App.tsx

@@ -12,6 +12,7 @@ import { LanguageManager } from './components/LanguageManager';
 
 function App() {
   const { t } = useTranslation();
+  const showToast = useToast();
 
   return (
     <>
@@ -41,6 +42,9 @@ function App() {
           </Alert>
         </Box>
       </div>
+      <Button onClick={() => showToast({ message: 'info toast' })}>
+        toast
+      </Button>
     </>
   );
 }
@@ -48,6 +52,7 @@ function App() {
 export default App;
 
 import { Button } from '@mui/material';
+import { useToast } from '@rkheftan/harmony-ui';
 
 export const ThemeToggleButton = () => {
   const { mode, setMode } = useColorScheme();