Add initial JSON data files and implement core page components for game functionality

app/Screens/JoinPrivateGamePage.jsx

@@ -1,19 +1,76 @@
 import React, { useState } from 'react';
-import { View, TextInput, Button } from 'react-native';
+import { View, Text, TextInput, Pressable, StyleSheet } from 'react-native';
+import { useNavigation } from '@react-navigation/native';
+import usePrivateGameViewModel from '../ViewModel/usePrivateGameViewModel';
 
 const JoinPrivateGamePage = () => {
-  const [joinCode, setJoinCode] = useState('');
+  const navigation = useNavigation();
+  const { joinCode, error, setJoinCode, joinWithCode } = usePrivateGameViewModel();
+  const [submitting, setSubmitting] = useState(false);
 
-  const handleJoinGame = () => {
-    // Logic to check join code and redirect to game lobby
+  const handleJoinGame = async () => {
+    setSubmitting(true);
+    const group = await joinWithCode();
+    setSubmitting(false);
+    if (!group) {
+      return;
+    }
+    navigation.navigate('game-lobby');
   };
 
   return (
-    <View>
-      <TextInput placeholder="Enter Join Code" value={joinCode} onChangeText={setJoinCode} />
-      <Button title="Join Game" onPress={handleJoinGame} />
+    <View style={styles.container}>
+      <Text style={styles.title}>Join Private Game</Text>
+      <TextInput
+        style={styles.input}
+        placeholder="Enter Join Code"
+        autoCapitalize="characters"
+        maxLength={6}
+        value={joinCode}
+        onChangeText={setJoinCode}
+      />
+      <Pressable style={styles.button} onPress={handleJoinGame}>
+        <Text style={styles.buttonText}>{submitting ? 'Joining...' : 'Join Game'}</Text>
+      </Pressable>
+      {!!error && <Text style={styles.errorText}>{error}</Text>}
     </View>
   );
 };
 
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    justifyContent: 'center',
+    padding: 20,
+    gap: 12,
+    backgroundColor: '#ffffff',
+  },
+  title: {
+    fontSize: 26,
+    fontWeight: '700',
+    color: '#111827',
+    marginBottom: 8,
+  },
+  input: {
+    borderWidth: 1,
+    borderColor: '#d1d5db',
+    borderRadius: 8,
+    paddingHorizontal: 12,
+    paddingVertical: 10,
+  },
+  button: {
+    backgroundColor: '#2563eb',
+    borderRadius: 8,
+    paddingVertical: 12,
+    alignItems: 'center',
+  },
+  buttonText: {
+    color: '#ffffff',
+    fontWeight: '600',
+  },
+  errorText: {
+    color: '#dc2626',
+  },
+});
+
 export default JoinPrivateGamePage;