Font Contrast Issue

main.dart

import 'package:flutter/material.dart';

ThemeData getLightTheme() => ThemeData(
  brightness: Brightness.light,
  colorScheme: ColorScheme.fromSeed(
    seedColor: Colors.blue,
    brightness: Brightness.light,
  ),
);

ThemeData getDarkTheme() => ThemeData(
  brightness: Brightness.dark,
  colorScheme: ColorScheme.fromSeed(
    seedColor: Colors.blue,
    brightness: Brightness.dark,
  ),
);

void main() {
  runApp(const MyApp());
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  var _themeMode = ThemeMode.light;

  void _toggleThemeMode() {
    setState(() {
      _themeMode =
          _themeMode == ThemeMode.light ? ThemeMode.dark : ThemeMode.light;
    });
  }

  @override
  Widget build(BuildContext context) => MaterialApp(
    theme: getLightTheme(),
    darkTheme: getDarkTheme(),
    themeMode: _themeMode,
    debugShowCheckedModeBanner: false,
    home: Builder(
      builder:
          (context) => Scaffold(
            appBar: AppBar(
              actions: [
                IconButton(
                  icon: const Icon(Icons.brightness_6),
                  onPressed: _toggleThemeMode,
                ),
              ],
            ),
            body: Center(
              child: Text(
                'Working',
                style: Theme.of(context).textTheme.bodyLarge,
              ),
            ),
          ),
    ),
  );
}