refactor: position logic

lib/game/components/bonus_word.dart

@@ -78,19 +78,23 @@ class BonusWord extends Component with BlocComponent<GameBloc, GameState> {
   Future<void> onLoad() async {
     await super.onLoad();
     final letters = GameBloc.bonusWord.split('');
+    final rightSide = Vector2(-1, 1);
+    final bottomOffset = Vector2(-12.92, -1.82);
+    final midOffset = Vector2(-8.33, 0.65);
+    final topOffset = Vector2(-2.88, 1.75);
 
     final letter0 = BonusLetter(letter: letters[0], index: 0)
-      ..initialPosition = _position + Vector2(-12.92, -1.82);
+      ..initialPosition = _position + bottomOffset;
     final letter1 = BonusLetter(letter: letters[1], index: 1)
-      ..initialPosition = _position + Vector2(-8.33, 0.65);
+      ..initialPosition = _position + midOffset;
     final letter2 = BonusLetter(letter: letters[2], index: 2)
-      ..initialPosition = _position + Vector2(-2.88, 1.75);
+      ..initialPosition = _position + topOffset;
     final letter3 = BonusLetter(letter: letters[3], index: 3)
-      ..initialPosition = _position + Vector2(2.88, 1.75);
+      ..initialPosition = _position + (topOffset..multiply(rightSide));
     final letter4 = BonusLetter(letter: letters[4], index: 4)
-      ..initialPosition = _position + Vector2(8.33, 0.65);
+      ..initialPosition = _position + (midOffset..multiply(rightSide));
     final letter5 = BonusLetter(letter: letters[5], index: 5)
-      ..initialPosition = _position + Vector2(12.92, -1.82);
+      ..initialPosition = _position + (bottomOffset..multiply(rightSide));
 
     unawaited(
       addAll([