fix: replace FlashList with FlatList to fix black screen in ScrollView

FlashList cannot be nested inside ScrollView. Changed to FlatList with scrollEnabled=false to allow proper rendering within the parent ScrollView.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/(tabs)/index.tsx

@@ -1,4 +1,4 @@
-import { FlashList } from '@shopify/flash-list';
+import { FlatList } from 'react-native';
 import { Image } from 'expo-image';
 import { LinearGradient } from 'expo-linear-gradient';
 import { useLocalSearchParams, useRouter } from 'expo-router';
@@ -376,7 +376,7 @@ export default function HomeScreen() {
                             setGridWidth(width)
                         }}
                     >
-                        <FlashList
+                        <FlatList
                             data={displayCardData}
                             renderItem={({ item, index }) => (
                                 <Card
@@ -393,9 +393,8 @@ export default function HomeScreen() {
                             )}
                             keyExtractor={(item) => item.id!}
                             numColumns={numColumns}
-                            estimatedItemSize={cardWidth * 1.5}
                             showsVerticalScrollIndicator={false}
-                            scrollEventThrottle={Platform.OS === 'ios' ? 16 : 50}
+                            scrollEnabled={false}
                         />
                     </View>
                 )}