Implement login functionality and create profile screen with secure storage

app/profile.tsx

@@ -0,0 +1,76 @@
+import * as SecureStore from 'expo-secure-store';
+import React, { useEffect, useState } from "react";
+import { StyleSheet, Text, View } from "react-native";
+
+const PRIMARY = '#A24BFA';
+const BG = '#0c0a0a';
+
+export default function Profile() {
+  const [fullName, setFullName] = useState('');
+  const [email, setEmail] = useState('');
+  const [userId, setUserId] = useState('');
+
+  useEffect(() => {
+    (async () => {
+      const name = await SecureStore.getItemAsync('fullName');
+      const mail = await SecureStore.getItemAsync('email');
+      const uid = await SecureStore.getItemAsync('userId');
+      setFullName(name || '');
+      setEmail(mail || '');
+      setUserId(uid || '');
+    })();
+  }, []);
+
+  return (
+    <View style={styles.container}>
+      <Text style={styles.title}>Profil</Text>
+      <View style={styles.card}>
+        <Text style={styles.label}>Név:</Text>
+        <Text style={styles.value}>{fullName}</Text>
+        <Text style={styles.label}>Email:</Text>
+        <Text style={styles.value}>{email}</Text>
+        <Text style={styles.label}>UserID:</Text>
+        <Text style={styles.value}>{userId}</Text>
+      </View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: BG,
+    justifyContent: 'center',
+    alignItems: 'center',
+  },
+  title: {
+    color: '#fff',
+    fontWeight: 'bold',
+    fontSize: 28,
+    textAlign: 'center',
+    marginBottom: 24,
+  },
+  card: {
+    backgroundColor: 'rgba(24, 20, 28, 0.95)',
+    borderRadius: 24,
+    padding: 32,
+    width: '90%',
+    maxWidth: 400,
+    shadowColor: '#000',
+    shadowOpacity: 0.3,
+    shadowRadius: 24,
+    shadowOffset: { width: 0, height: 8 },
+    elevation: 8,
+  },
+  label: {
+    color: '#bdbdbd',
+    fontSize: 16,
+    marginTop: 12,
+    fontWeight: 'bold',
+  },
+  value: {
+    color: PRIMARY,
+    fontSize: 18,
+    marginBottom: 8,
+  },
+});