feat: add message feature

lib/feature/game/presentation/bloc/game_state.dart

@@ -47,6 +47,15 @@ class TableLobby {
       '${players.map((p) => '${p.name}${p.host ? '*' : ''}@${p.seat}').join(',')}';
 }
 
+/// حبابِ پیام/شکلکِ یک بازیکن که کنارِ آواتارش نشان داده می‌شود.
+/// id برای انقضای دقیق (پاک‌کردنِ همین حباب و نه حبابِ جدیدتر) به‌کار می‌رود.
+class ChatBubble {
+  final String? text;
+  final String? emoji;
+  final int id;
+  const ChatBubble({this.text, this.emoji, required this.id});
+}
+
 class GameUiState extends Equatable {
   final WsStatus connection;
   final GameState? state;
@@ -56,6 +65,7 @@ class GameUiState extends Equatable {
   final TableLobby? lobby;
   final int? countdown;
   final bool tableClosed;
+  final Map<int, ChatBubble> chatBubbles; // جایگاه ⇒ حبابِ پیامِ فعال
 
   const GameUiState({
     this.connection = WsStatus.connecting,
@@ -66,6 +76,7 @@ class GameUiState extends Equatable {
     this.lobby,
     this.countdown,
     this.tableClosed = false,
+    this.chatBubbles = const {},
   });
 
   GameUiState copyWith({
@@ -77,6 +88,7 @@ class GameUiState extends Equatable {
     TableLobby? lobby,
     int? countdown,
     bool? tableClosed,
+    Map<int, ChatBubble>? chatBubbles,
     bool clearHandResult = false,
     bool clearNotice = false,
   }) =>
@@ -89,6 +101,7 @@ class GameUiState extends Equatable {
         lobby: lobby ?? this.lobby,
         countdown: countdown ?? this.countdown,
         tableClosed: tableClosed ?? this.tableClosed,
+        chatBubbles: chatBubbles ?? this.chatBubbles,
       );
 
   @override
@@ -101,5 +114,8 @@ class GameUiState extends Equatable {
         lobby?.sig,
         countdown,
         tableClosed,
+        chatBubbles.entries
+            .map((e) => '${e.key}:${e.value.id}')
+            .join(','),
       ];
 }