fix: edit modal respects Android safe area insets

Removed iOS-only presentationStyle='pageSheet'. Modal now applies
useSafeAreaInsets() padding so it doesn't overlap the status bar
or gesture navigation bar on Android.

src/screens/ActivityDetailScreen.tsx

@@ -1,8 +1,9 @@
 import React, { useEffect, useLayoutEffect, useMemo, useState } from 'react';
 import {
   View, Text, StyleSheet, ActivityIndicator, ScrollView,
-  Modal, TextInput, TouchableOpacity, Pressable, Alert,
+  Modal, TextInput, TouchableOpacity, Alert,
 } from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
 import { useRoute, RouteProp, useNavigation } from '@react-navigation/native';
 import { Map, Camera, GeoJSONSource, Layer } from '@maplibre/maplibre-react-native';
 import type { LineLayerStyle } from '@maplibre/maplibre-react-native';
@@ -57,6 +58,7 @@ function formatDuration(secs: number) {
 export function ActivityDetailScreen() {
   const nav = useNavigation();
   const { accent, accentDim } = useTheme();
+  const insets = useSafeAreaInsets();
   const route = useRoute<Route>();
 
   const [rec, setRec]       = useState<SavedRecording>(route.params.recording);
@@ -197,8 +199,8 @@ export function ActivityDetailScreen() {
       </ScrollView>
 
       {/* ── Edit modal ── */}
-      <Modal visible={editVisible} animationType="slide" presentationStyle="pageSheet" onRequestClose={handleCancelEdit}>
-        <View style={styles.editContainer}>
+      <Modal visible={editVisible} animationType="slide" onRequestClose={handleCancelEdit}>
+        <View style={[styles.editContainer, { paddingTop: insets.top, paddingBottom: insets.bottom }]}>
           <View style={styles.editHeader}>
             <TouchableOpacity onPress={handleCancelEdit}>
               <Text style={styles.editCancel}>Cancel</Text>