fix remaining header-related issues

amnet-native/App.tsx

@@ -114,7 +114,12 @@ export default function AppRoot() {
                             {/* main app */}
                             <Stack.Screen name="app" component={AppContent} options={{headerShown: false}}/>
 
-                            <Stack.Group screenOptions={{presentation: "modal"}}>
+                            <Stack.Group screenOptions={{
+                                    presentation: "modal",
+                                    headerTitleStyle: {
+                                        fontWeight: "bold"
+                                    }
+                                }}>
                                 <Stack.Screen name="add-server" component={ServerAddModal} options={{title: "Add Server"}}/>
                                 <Stack.Screen name="add-card" component={CardAddModal} options={{title: "Add Card", headerShown: Platform.OS !== 'ios'}}/>
                                 <Stack.Screen name="edit-card" component={CardEditorModal} options={{title: "Edit Card"}}/>

amnet-native/app/card/CardAddModal.tsx

@@ -14,7 +14,7 @@ const Stack = createNativeStackNavigator();
 
 function CardAddModal() {
     return (
-        <Stack.Navigator initialRouteName="Select">
+        <Stack.Navigator initialRouteName="Select" screenOptions={{headerTitleStyle: {fontWeight: "bold"}}}>
             <Stack.Screen name="Select" component={CardAddMethodSelector} options={{headerShown: false}}/>
 
             <Stack.Screen name="Scan" component={PhysicalCardScan} options={{title: "Add Physical Card"}}/>
@@ -34,7 +34,9 @@ function CardAddMethodSelector({navigation}) {
     return (
         <View style={{paddingHorizontal: 15, paddingTop: 90, gap: 8}}>
             <View style={{paddingBottom: 25, gap: 5}}>
-                <Text variant="titleLarge" style={{textAlign: "center", fontSize: 32, fontWeight: "bold"}}>Add new Card</Text>
+                <Text variant="titleLarge" style={{textAlign: "center", fontSize: 32, lineHeight: 32, fontWeight: "bold"}}>
+                    Add new Card
+                </Text>
                 <Text variant="bodyMedium" style={{textAlign: "center"}}>
                     AMNet supports scanning physical cards, entering details manually or generating new ones.
                 </Text>