refactor: split app into modular src architecture

src/components/TripPicker.js

@@ -0,0 +1,28 @@
+import React from 'react';
+import { Pressable, ScrollView, Text, View } from 'react-native';
+import { styles } from '../styles';
+
+export default function TripPicker({ trips, selectedTripId, onChooseTrip }) {
+  return (
+    <View style={styles.tripPickerWrap}>
+      <ScrollView horizontal showsHorizontalScrollIndicator={false} contentContainerStyle={styles.tripChipScroll}>
+        {trips.length ? (
+          trips
+            .slice()
+            .sort((a, b) => b.startDate.localeCompare(a.startDate))
+            .map((trip) => {
+              const active = selectedTripId === trip.id;
+              return (
+                <Pressable key={trip.id} style={[styles.tripChip, active && styles.tripChipActive]} onPress={() => onChooseTrip(trip.id)}>
+                  <Text style={[styles.tripChipText, active && styles.tripChipTextActive]}>{trip.name}</Text>
+                  <Text style={[styles.tripChipSub, active && styles.tripChipSubActive]}>{trip.startDate}</Text>
+                </Pressable>
+              );
+            })
+        ) : (
+          <Text style={styles.muted}>Create your first trip to start.</Text>
+        )}
+      </ScrollView>
+    </View>
+  );
+}