Got some new errors. but close to having stuff

app/(tabs)/index.tsx

@@ -19,7 +19,7 @@ const Index = () => {
           onPress={() => alert('You pressed a button.')}
         >
         <FontAwesome name="picture-o" size={18}
-          color='#25292e' style={styles.buttonIcon}
+          color={Colors[scheme].background} style={styles.buttonIcon}
         />
         <ThemedText
           style={[

app/_layout.tsx

@@ -1,10 +1,23 @@
 import { Stack } from "expo-router";
+import React, { useState } from 'react';
+
+import SignInScreen from "@/components/auth/SignInScreen";
+import { PushNotificationManager }
+from "@/components/services/notifications/PushNotificationManager";
 
 export default function RootLayout() {
+  const [isSignedIn, setIsSignedIn] = useState(false);
+  if (!isSignedIn) {
+    return (
+      <SignInScreen onSignIn={() => setIsSignedIn(true)} />
+    );
+  }
   return (
-    <Stack>
-      <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
-      <Stack.Screen name="+not-found" />
-    </Stack>
+    <PushNotificationManager>
+      <Stack>
+        <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
+        <Stack.Screen name="+not-found" />
+      </Stack>
+    </PushNotificationManager>
   );
 }