Add ScreenHeader component and update page layouts for consistent header usage

app/components/ScreenHeader.jsx

@@ -0,0 +1,31 @@
+import React from 'react';
+import { View, Text, StyleSheet } from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+
+const ScreenHeader = ({ title }) => {
+  const insets = useSafeAreaInsets();
+
+  return (
+    <View style={[styles.container, { paddingTop: insets.top + 10 }]}>
+      <Text style={styles.title}>{title}</Text>
+    </View>
+  );
+};
+
+const styles = StyleSheet.create({
+  container: {
+    backgroundColor: '#000000',
+    paddingHorizontal: 16,
+    paddingBottom: 12,
+    minHeight: 72,
+    justifyContent: 'flex-end',
+  },
+  title: {
+    color: '#ffffff',
+    fontSize: 20,
+    fontWeight: '700',
+  },
+});
+
+export default ScreenHeader;
+