chore: update round lost logic

lib/game/bloc/game_bloc.dart

@@ -16,7 +16,7 @@ class GameBloc extends Bloc<GameEvent, GameState> {
     on<GameStarted>(_onGameStarted);
   }
 
-  final _maxScore = 9999999999;
+  static const _maxScore = 9999999999;
 
   void _onGameStarted(GameStarted _, Emitter emit) {
     emit(state.copyWith(status: GameStatus.playing));
@@ -27,7 +27,10 @@ class GameBloc extends Bloc<GameEvent, GameState> {
   }
 
   void _onRoundLost(RoundLost event, Emitter emit) {
-    final score = state.totalScore + state.roundScore * state.multiplier;
+    final score = math.min(
+      state.totalScore + state.roundScore * state.multiplier,
+      _maxScore,
+    );
     final roundsLeft = math.max(state.rounds - 1, 0);
 
     emit(

test/game/bloc/game_bloc_test.dart

@@ -91,6 +91,28 @@ void main() {
         ],
       );
 
+      blocTest<GameBloc, GameState>(
+        "multiplier doesn't increase score above the max score",
+        build: GameBloc.new,
+        seed: () => const GameState(
+          totalScore: 9999999998,
+          roundScore: 1,
+          multiplier: 2,
+          rounds: 1,
+          bonusHistory: [],
+          status: GameStatus.playing,
+        ),
+        act: (bloc) => bloc.add(const RoundLost()),
+        expect: () => [
+          isA<GameState>()
+            ..having(
+              (state) => state.totalScore,
+              'totalScore',
+              9999999999,
+            )
+        ],
+      );
+
       blocTest<GameBloc, GameState>(
         'resets multiplier when round is lost',
         build: GameBloc.new,