Add dark mode support with theme toggle

[Copilot]

Implements dark mode for the Flutter app with a toggle button in the AppBar.

Changes

• Theme configuration: Added darkTheme to MaterialApp with Material Design 3 dark color scheme
• State management: Converted MyApp to StatefulWidget to manage ThemeMode state
• UI toggle: IconButton in AppBar shows moon/sun icon based on current theme
• Testing: Added test coverage for theme switching

// MyApp now manages theme state
class _MyAppState extends State<MyApp> {
  ThemeMode _themeMode = ThemeMode.light;
  
  void _toggleTheme() {
    setState(() {
      _themeMode = _themeMode == ThemeMode.light ? ThemeMode.dark : ThemeMode.light;
    });
  }
}

// MaterialApp configured with both themes
MaterialApp(
  theme: ThemeData(
    colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
  ),
  darkTheme: ThemeData(
    colorScheme: ColorScheme.fromSeed(
      seedColor: Colors.deepPurple,
      brightness: Brightness.dark,
    ),
  ),
  themeMode: _themeMode,
  // ...
)

Note: Theme preference is in-memory only; resets on app restart.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://storage.googleapis.com/flutter_infra_release/flutter/78fc3012e45889657f72359b005af7beac47ba3d/dart-sdk-linux-x64.zip
  • Triggering command: /update-job-proxy /update-job-proxy -o br-5971a5284e5e -j DOCKER-ISOLATION-STAGE-2 Trus_Root_CA.pem /usr/share/ca-certificates/mozilla/SSL.com_Root_Certification_Authority_RSA.crt test 94d09e5.0 test test sed -e CA1.pem /usr/share/ca-certificates/mozilla/UCA_Global_G2_Root.crt /usr/local/sbin/test (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

add dark mode

Created from Copilot CLI via the copilot delegate command.

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