Refactor widget directory structure by organizing tiles and buttons

- Move `GameTile` and `DoubleRowInfoTile` to `presentation/widgets/tiles/`
- Move `CustomWidthButton` and `QuickCreateButton` to `presentation/widgets/buttons/`
- Update import paths in `HomeView`, `GroupsView`, `GameHistoryView`, and `CreateGroupView`

lib/presentation/views/main_menu/create_group_view.dart

@@ -3,8 +3,8 @@ import 'package:game_tracker/core/custom_theme.dart';
 import 'package:game_tracker/data/db/database.dart';
 import 'package:game_tracker/data/dto/group.dart';
 import 'package:game_tracker/data/dto/player.dart';
+import 'package:game_tracker/presentation/widgets/buttons/custom_width_button.dart';
 import 'package:game_tracker/presentation/widgets/custom_search_bar.dart';
-import 'package:game_tracker/presentation/widgets/custom_width_button.dart';
 import 'package:game_tracker/presentation/widgets/text_input_field.dart';
 import 'package:game_tracker/presentation/widgets/tiles/text_icon_list_tile.dart';
 import 'package:game_tracker/presentation/widgets/tiles/text_icon_tile.dart';

lib/presentation/views/main_menu/game_history_view.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:game_tracker/core/custom_theme.dart';
-import 'package:game_tracker/presentation/widgets/double_row_info_tile.dart';
+import 'package:game_tracker/presentation/widgets/tiles/double_row_info_tile.dart';
 import 'package:game_tracker/presentation/widgets/top_centered_message.dart';
 
 class GameHistoryView extends StatefulWidget {

lib/presentation/views/main_menu/groups_view.dart

@@ -4,7 +4,7 @@ import 'package:game_tracker/data/db/database.dart';
 import 'package:game_tracker/data/dto/group.dart';
 import 'package:game_tracker/data/dto/player.dart';
 import 'package:game_tracker/presentation/views/main_menu/create_group_view.dart';
-import 'package:game_tracker/presentation/widgets/custom_width_button.dart';
+import 'package:game_tracker/presentation/widgets/buttons/custom_width_button.dart';
 import 'package:game_tracker/presentation/widgets/tiles/group_tile.dart';
 import 'package:game_tracker/presentation/widgets/top_centered_message.dart';
 import 'package:provider/provider.dart';

lib/presentation/views/main_menu/home_view.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:game_tracker/data/db/database.dart';
-import 'package:game_tracker/presentation/widgets/game_tile.dart';
+import 'package:game_tracker/presentation/widgets/buttons/quick_create_button.dart';
-import 'package:game_tracker/presentation/widgets/quick_create_button.dart';
+import 'package:game_tracker/presentation/widgets/tiles/game_tile.dart';
 import 'package:game_tracker/presentation/widgets/tiles/info_tile.dart';
 import 'package:game_tracker/presentation/widgets/tiles/quick_info_tile.dart';
 import 'package:provider/provider.dart';