feat : Composant Bouton

src/app/_layout.tsx

@@ -1,8 +1,15 @@
 import { Stack } from 'expo-router';
 
 import { ThemeProvider } from '../theme';
+import { useAppFonts } from '../theme/typography';
 
 export default function RootLayout() {
+  const [fontsLoaded] = useAppFonts();
+
+  if (!fontsLoaded) {
+    return null;
+  }
+
   return (
     <ThemeProvider>
       <Stack />