chore: unused imports and annotation missed

lib/game/components/backbox/displays/game_over_info_display.dart

@@ -3,6 +3,7 @@ import 'dart:async';
 import 'package:flame/components.dart';
 import 'package:flame/input.dart';
 import 'package:flutter/material.dart';
+import 'package:pinball/game/game.dart';
 import 'package:pinball/l10n/l10n.dart';
 import 'package:pinball_components/pinball_components.dart';
 import 'package:pinball_flame/pinball_flame.dart';
@@ -61,6 +62,12 @@ class GameOverInfoDisplay extends Component with HasGameRef {
             ),
           ],
         );
+
+  @override
+  Future<void> onLoad() async {
+    await super.onLoad();
+    gameRef.overlays.add(PinballGame.playButtonOverlay);
+  }
 }
 
 class _InstructionsComponent extends PositionComponent with HasGameRef {

test/game/components/backbox/backbox_test.dart

@@ -126,6 +126,7 @@ class _MockAppLocalizations extends Mock implements AppLocalizations {
   @override
   String get openSourceCode => '';
 
+  @override
   String get leaderboardErrorMessage => '';
 }