feat: add game graphic

lib/feature/game/presentation/widgets/table_hud.dart

@@ -211,6 +211,22 @@ class TableHud extends StatelessWidget {
   );
 }
 
+/// گرادیانِ قابِ آواتار بر اساسِ نشانِ رتبه (برنز→پادشاه). پیش‌فرض: طلایی.
+List<Color> _rankFrame(String tier) {
+  switch (tier) {
+    case 'bronze':
+      return const [Color(0xFFCD9B6A), Color(0xFF7A4A22)];
+    case 'silver':
+      return const [Color(0xFFEDF1F4), Color(0xFF98A2AD)];
+    case 'diamond':
+      return const [Color(0xFF9BE7F0), Color(0xFF2E8BA0)];
+    case 'king':
+      return const [Color(0xFFCE9BEA), Color(0xFF6A2FA0)];
+    default: // gold و ناشناخته/بات
+      return const [Color(0xFFF3D27A), AppColors.goldDark];
+  }
+}
+
 class _PlayerSeat extends StatelessWidget {
   final GamePlayer player;
   final double diameter;
@@ -271,19 +287,24 @@ class _PlayerSeat extends StatelessWidget {
         clipBehavior: Clip.none,
         alignment: Alignment.center,
         children: [
-          // قابِ طلایی + آواتار.
+          // قابِ رتبه‌ای + آواتار (رنگِ قاب بر اساسِ نشانِ رتبه‌ی بازیکن).
           Container(
             width: diameter,
             height: diameter,
             decoration: BoxDecoration(
               shape: BoxShape.circle,
-              gradient: const LinearGradient(
+              gradient: LinearGradient(
                 begin: Alignment.topCenter,
                 end: Alignment.bottomCenter,
-                colors: [Color(0xFFF3D27A), AppColors.goldDark],
+                colors: _rankFrame(player.bot ? '' : player.rankTier),
               ),
-              boxShadow: const [
-                BoxShadow(color: Colors.black54, blurRadius: 6),
+              boxShadow: [
+                const BoxShadow(color: Colors.black54, blurRadius: 6),
+                if (isTurn)
+                  BoxShadow(
+                      color: _rankFrame(player.rankTier)[0]
+                          .withValues(alpha: 0.6),
+                      blurRadius: 12),
               ],
             ),
             padding: EdgeInsets.all(ringW),