redirect landing page to calendar (#544)

Author: Adventurer-E

apps/expo/src/app/index.tsx

@@ -3,6 +3,7 @@ import { Text, View } from "react-native";
 import { SafeAreaView } from "react-native-safe-area-context";
 import * as Notifications from "expo-notifications";
 import { Redirect, Stack } from "expo-router";
+import { useAuth } from "@clerk/clerk-expo";
 
 import registerForPushNotificationsAsync from "~/notifications/registerNotifications";
 
@@ -19,6 +20,7 @@ const Index = () => {
   const [, setExpoPushToken] = useState<Notifications.ExpoPushToken | null>(
     null,
   );
+  const { isSignedIn } = useAuth();
 
   useEffect(() => {
     registerForPushNotificationsAsync()
@@ -33,7 +35,7 @@ const Index = () => {
       <View className="h-full w-full p-4">
         <Text className="font-poppins400"> Index </Text>
       </View>
-      <Redirect href="/signin" />
+      <Redirect href={isSignedIn ? "/calendar/" : "/signin"} />
     </SafeAreaView>
   );
 };