add error message for game deletion and implement search functionality

lib/presentation/views/main_menu/match_view/match_view.dart

@@ -19,7 +19,7 @@ import 'package:tallee/presentation/widgets/tiles/match_tile.dart';
 import 'package:tallee/presentation/widgets/top_centered_message.dart';
 
 class MatchView extends StatefulWidget {
-  /// A view that displays a list of matches
+  /// A view that displays a list of matches.
   const MatchView({super.key});
 
   @override
@@ -27,11 +27,14 @@ class MatchView extends StatefulWidget {
 }
 
 class _MatchViewState extends State<MatchView> {
+  /// Database instance used to access match data.
   late final AppDatabase db;
+
+  /// Indicates whether matches are currently being loaded.
   bool isLoading = true;
 
   /// Loaded matches from the database,
-  /// initially filled with skeleton matches
+  /// initially filled with skeleton matches.
   List<Match> matches = List.filled(
     4,
     Match(