Add pending admin state handling and update navigation logic for admin approval

src/components/screens/LeaderboardScreen.js

@@ -184,6 +184,14 @@ const LeaderboardScreen = ({navigation, route}) => {
         );
     }
 
+    if (session.isPendingAdmin && !session.isAcceptedAdmin) {
+        return (
+            <Screen style={styles.center}>
+                <Text style={styles.body}>Waiting for admin approval. You will get access once approved.</Text>
+            </Screen>
+        );
+    }
+
     if (isBusiness && isAdmin && !selectedDepartment) {
         return (
             <Screen style={styles.container}>