using M3ETheme, non dynamic color way

snippet.dart

 @override
  Widget build(BuildContext context) {
    final light = ColorScheme.fromSeed(
        seedColor: Colors.purple, brightness: Brightness.light);
    final dark = ColorScheme.fromSeed(
        seedColor: Colors.purple, brightness: Brightness.dark);
    return MaterialApp(
      title: 'M3E Gallery',
      theme: light.toM3EThemeData(override: M3eOverride(colors: M3ECustomColors.from(light), 
                              typography: M3ECustomTypography(base: CustomTextTheme, emphasized: MyM3ECustomEmphasized ),
                              shapes: M3ECustomShapes.expressive(),
                              spacing: M3ECustomSpacing.regular(),
                              motion: M3EMotion.expressive()), 
                         base: ThemeDataWithCustomComponentThemes(colorScheme: light) ),
      darkTheme: dark.toM3EThemeData(override: M3eOverride(colors: M3ECustomColors(dark), 
                              typography: M3ECustomTypography(base: CustomTextTheme, emphasized: MyM3ECustomEmphasized ),
                              shapes: M3ECustomShapes.expressive(),
                              spacing: M3ECustomSpacing.regular(),
                              motion: M3EMotion.expressive()), 
                  base: ThemeDataWithCustomComponentThemes(colorScheme: dark)),
      themeMode: _mode,
      home: GalleryHome(
        isDark: _mode == ThemeMode.dark,
        onToggleBrightness: _toggleMode,
      ),
      debugShowCheckedModeBanner: false,
    );
  }