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components/default/Collapsible.tsx

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+import Ionicons from '@expo/vector-icons/Ionicons';
+import { PropsWithChildren, useState } from 'react';
+import { StyleSheet, TouchableOpacity, useColorScheme } from 'react-native';
+
+import { ThemedText } from '@/components/ThemedText';
+import { ThemedView } from '@/components/ThemedView';
+import { Colors } from '@/constants/Colors';
+
+export function Collapsible({ children, title }: PropsWithChildren & { title: string }) {
+  const [isOpen, setIsOpen] = useState(false);
+  const theme = useColorScheme() ?? 'light';
+
+  return (
+    <ThemedView>
+      <TouchableOpacity
+        style={styles.heading}
+        onPress={() => setIsOpen((value) => !value)}
+        activeOpacity={0.8}>
+        <Ionicons
+          name={isOpen ? 'chevron-down' : 'chevron-forward-outline'}
+          size={18}
+          color={theme === 'light' ? Colors.light.icon : Colors.dark.icon}
+        />
+        <ThemedText type="defaultSemiBold">{title}</ThemedText>
+      </TouchableOpacity>
+      {isOpen && <ThemedView style={styles.content}>{children}</ThemedView>}
+    </ThemedView>
+  );
+}
+
+const styles = StyleSheet.create({
+  heading: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: 6,
+  },
+  content: {
+    marginTop: 6,
+    marginLeft: 24,
+  },
+});

components/default/ExternalLink.tsx

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+import { Link } from 'expo-router';
+import { openBrowserAsync } from 'expo-web-browser';
+import { type ComponentProps } from 'react';
+import { Platform } from 'react-native';
+
+type Props = Omit<ComponentProps<typeof Link>, 'href'> & { href: string };
+
+export function ExternalLink({ href, ...rest }: Props) {
+  return (
+    <Link
+      target="_blank"
+      {...rest}
+      href={href}
+      onPress={async (event) => {
+        if (Platform.OS !== 'web') {
+          // Prevent the default behavior of linking to the default browser on native.
+          event.preventDefault();
+          // Open the link in an in-app browser.
+          await openBrowserAsync(href);
+        }
+      }}
+    />
+  );
+}

components/default/ParallaxScrollView.tsx

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+import type { PropsWithChildren, ReactElement } from 'react';
+import { StyleSheet, useColorScheme } from 'react-native';
+import Animated, {
+  interpolate,
+  useAnimatedRef,
+  useAnimatedStyle,
+  useScrollViewOffset,
+} from 'react-native-reanimated';
+
+import { ThemedView } from '@/components/ThemedView';
+
+const HEADER_HEIGHT = 250;
+
+type Props = PropsWithChildren<{
+  headerImage: ReactElement;
+  headerBackgroundColor: { dark: string; light: string };
+}>;
+
+export default function ParallaxScrollView({
+  children,
+  headerImage,
+  headerBackgroundColor,
+}: Props) {
+  const colorScheme = useColorScheme() ?? 'light';
+  const scrollRef = useAnimatedRef<Animated.ScrollView>();
+  const scrollOffset = useScrollViewOffset(scrollRef);
+
+  const headerAnimatedStyle = useAnimatedStyle(() => {
+    return {
+      transform: [
+        {
+          translateY: interpolate(
+            scrollOffset.value,
+            [-HEADER_HEIGHT, 0, HEADER_HEIGHT],
+            [-HEADER_HEIGHT / 2, 0, HEADER_HEIGHT * 0.75]
+          ),
+        },
+        {
+          scale: interpolate(scrollOffset.value, [-HEADER_HEIGHT, 0, HEADER_HEIGHT], [2, 1, 1]),
+        },
+      ],
+    };
+  });
+
+  return (
+    <ThemedView style={styles.container}>
+      <Animated.ScrollView ref={scrollRef} scrollEventThrottle={16}>
+        <Animated.View
+          style={[
+            styles.header,
+            { backgroundColor: headerBackgroundColor[colorScheme] },
+            headerAnimatedStyle,
+          ]}>
+          {headerImage}
+        </Animated.View>
+        <ThemedView style={styles.content}>{children}</ThemedView>
+      </Animated.ScrollView>
+    </ThemedView>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+  },
+  header: {
+    height: 250,
+    overflow: 'hidden',
+  },
+  content: {
+    flex: 1,
+    padding: 32,
+    gap: 16,
+    overflow: 'hidden',
+  },
+});

components/default/navigation/TabBarIcon.tsx

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+// You can explore the built-in icon families and icons on the web at https://icons.expo.fyi/
+
+import Ionicons from '@expo/vector-icons/Ionicons';
+import { type IconProps } from '@expo/vector-icons/build/createIconSet';
+import { type ComponentProps } from 'react';
+
+export function TabBarIcon({ style, ...rest }: IconProps<ComponentProps<typeof Ionicons>['name']>) {
+  return <Ionicons size={28} style={[{ marginBottom: -3 }, style]} {...rest} />;
+}