Add ScreenHeader component and update page layouts for consistent header usage

app/Screens/RegisterPage.jsx

@@ -2,6 +2,7 @@ import React, { useState } from 'react';
 import { View, Text, TextInput, Pressable, StyleSheet } from 'react-native';
 import { useNavigation } from '@react-navigation/native';
 import useAuthViewModel from '../ViewModel/useAuthViewModel';
+import ScreenHeader from '../components/ScreenHeader';
 
 const RegisterPage = () => {
   const navigation = useNavigation();
@@ -32,63 +33,64 @@ const RegisterPage = () => {
   };
 
   return (
-    <View style={styles.container}>
-      <Text style={styles.title}>Register</Text>
-      <TextInput style={styles.input} placeholder="Username" value={username} onChangeText={setUsername} />
-      <TextInput
-        style={styles.input}
-        placeholder="Email"
-        autoCapitalize="none"
-        keyboardType="email-address"
-        value={email}
-        onChangeText={setEmail}
-      />
-      <TextInput style={styles.input} placeholder="Password" value={password} onChangeText={setPassword} secureTextEntry />
-      <TextInput
-        style={styles.input}
-        placeholder="Confirm Password"
-        value={confirmPassword}
-        onChangeText={setConfirmPassword}
-        secureTextEntry
-      />
-      <View style={styles.typeRow}>
-        <Pressable
-          style={[styles.typeButton, accountType === 'Individual' && styles.typeButtonActive]}
-          onPress={() => setAccountType('Individual')}
-        >
-          <Text style={[styles.typeText, accountType === 'Individual' && styles.typeTextActive]}>Individual</Text>
+    <View style={styles.wrapper}>
+      <ScreenHeader title="Register" />
+      <View style={styles.container}>
+        <TextInput style={styles.input} placeholder="Username" value={username} onChangeText={setUsername} />
+        <TextInput
+          style={styles.input}
+          placeholder="Email"
+          autoCapitalize="none"
+          keyboardType="email-address"
+          value={email}
+          onChangeText={setEmail}
+        />
+        <TextInput style={styles.input} placeholder="Password" value={password} onChangeText={setPassword} secureTextEntry />
+        <TextInput
+          style={styles.input}
+          placeholder="Confirm Password"
+          value={confirmPassword}
+          onChangeText={setConfirmPassword}
+          secureTextEntry
+        />
+        <View style={styles.typeRow}>
+          <Pressable
+            style={[styles.typeButton, accountType === 'Individual' && styles.typeButtonActive]}
+            onPress={() => setAccountType('Individual')}
+          >
+            <Text style={[styles.typeText, accountType === 'Individual' && styles.typeTextActive]}>Individual</Text>
+          </Pressable>
+          <Pressable
+            style={[styles.typeButton, accountType === 'Business/School' && styles.typeButtonActive]}
+            onPress={() => setAccountType('Business/School')}
+          >
+            <Text style={[styles.typeText, accountType === 'Business/School' && styles.typeTextActive]}>Business/School</Text>
+          </Pressable>
+        </View>
+        <Pressable style={styles.submitButton} onPress={handleRegister}>
+          <Text style={styles.submitText}>{submitting ? 'Creating...' : 'Create Account'}</Text>
         </Pressable>
-        <Pressable
-          style={[styles.typeButton, accountType === 'Business/School' && styles.typeButtonActive]}
-          onPress={() => setAccountType('Business/School')}
-        >
-          <Text style={[styles.typeText, accountType === 'Business/School' && styles.typeTextActive]}>Business/School</Text>
+        <View style={styles.errorSlot}>
+          <Text style={[styles.errorText, !error && styles.errorHidden]}>{error || ' '}</Text>
+        </View>
+        <Pressable onPress={() => navigation.navigate('(routes)/login')}>
+          <Text style={styles.backText}>Back to Login</Text>
         </Pressable>
       </View>
-      <Pressable style={styles.submitButton} onPress={handleRegister}>
-        <Text style={styles.submitText}>{submitting ? 'Creating...' : 'Create Account'}</Text>
-      </Pressable>
-      <Pressable onPress={() => navigation.navigate('(routes)/login')}>
-        <Text style={styles.backText}>Back to Login</Text>
-      </Pressable>
-      {!!error && <Text style={styles.errorText}>{error}</Text>}
     </View>
   );
 };
 
 const styles = StyleSheet.create({
+  wrapper: {
+    flex: 1,
+    backgroundColor: '#ffffff',
+  },
   container: {
     flex: 1,
     padding: 20,
     justifyContent: 'center',
     gap: 12,
-    backgroundColor: '#ffffff',
-  },
-  title: {
-    fontSize: 28,
-    fontWeight: '700',
-    color: '#111827',
-    marginBottom: 8,
   },
   input: {
     borderWidth: 1,
@@ -135,10 +137,17 @@ const styles = StyleSheet.create({
     color: '#2563eb',
     fontWeight: '600',
   },
+  errorSlot: {
+    minHeight: 20,
+    justifyContent: 'center',
+  },
   errorText: {
     textAlign: 'center',
     color: '#dc2626',
   },
+  errorHidden: {
+    opacity: 0,
+  },
 });
 
 export default RegisterPage;