feat: add themes

lib/character_themes/android_theme.dart

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+import 'package:flutter/material.dart';
+import 'package:pinball/character_themes/character_themes.dart';
+
+class AndroidTheme extends CharacterTheme {
+  const AndroidTheme();
+
+  @override
+  Color get ballColor => Colors.green;
+}

lib/character_themes/character_theme.dart

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+import 'package:equatable/equatable.dart';
+import 'package:flame/palette.dart';
+
+/// {@template character_theme}
+/// Template for creating character themes.
+/// {@endtemplate}
+abstract class CharacterTheme extends Equatable {
+  /// {@macro character_theme}
+  const CharacterTheme();
+
+  Color get ballColor;
+
+  @override
+  List<Object?> get props => [];
+}

lib/character_themes/character_themes.dart

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+export 'android_theme.dart';
+export 'character_theme.dart';
+export 'cubit/theme_cubit.dart';
+export 'dash_theme.dart';
+export 'dino_theme.dart';
+export 'sparky_theme.dart';

lib/character_themes/dash_theme.dart

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+import 'package:flutter/material.dart';
+import 'package:pinball/character_themes/character_themes.dart';
+
+class DashTheme extends CharacterTheme {
+  const DashTheme();
+
+  @override
+  Color get ballColor => Colors.blue;
+}

lib/character_themes/dino_theme.dart

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+import 'package:flutter/material.dart';
+import 'package:pinball/character_themes/character_themes.dart';
+
+class DinoTheme extends CharacterTheme {
+  const DinoTheme();
+
+  @override
+  Color get ballColor => Colors.grey;
+}

lib/character_themes/sparky_theme.dart

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+import 'package:flutter/material.dart';
+import 'package:pinball/character_themes/character_themes.dart';
+
+class SparkyTheme extends CharacterTheme {
+  const SparkyTheme();
+
+  @override
+  Color get ballColor => Colors.orange;
+}