Aggiunge overlay server-side burn-in e stabilizza diretta live.

Tabellone, badge e brand sono ricodificati nel flusso _air via OverlayRelay;
sync punteggio HTTP, volume condiviso rails/sidekiq, qualità 720p migliorata
e badge CONNECTING in ripresa da pausa.

Co-authored-by: Cursor <cursoragent@cursor.com>

mobile/lib/shared/api_client.dart

@@ -6,6 +6,7 @@ import '../providers/auth_provider.dart';
 import 'models/invite_preview.dart';
 import 'models/match.dart';
 import 'models/recording_item.dart';
+import 'models/score_state.dart';
 import 'models/stream_session.dart';
 import 'models/team.dart';
 import 'models/user.dart';
@@ -210,6 +211,19 @@ class ApiClient {
     return StreamSession.fromJson(response.data!);
   }
 
+  /// Persiste il tabellone e restituisce lo stato salvato sul server.
+  Future<ScoreState?> syncScore(String sessionId, Map<String, dynamic> payload) async {
+    final response = await _dio.patch<Map<String, dynamic>>(
+      '/sessions/$sessionId/score',
+      data: payload,
+    );
+    final score = response.data?['score'];
+    if (score is Map<String, dynamic>) {
+      return ScoreState.fromJson(score);
+    }
+    return null;
+  }
+
   Future<RegiaLinkResponse> createRegiaLink(String sessionId) async {
     final response = await _dio.post<Map<String, dynamic>>(
       '/sessions/$sessionId/regia_link',

mobile/lib/shared/websocket_service.dart

@@ -6,6 +6,7 @@ import 'package:x_action_cable_v2/x_action_cable.dart';
 import '../core/config.dart';
 import '../providers/auth_provider.dart';
 import '../providers/score_provider.dart';
+import '../providers/score_sync_provider.dart';
 import '../providers/session_provider.dart';
 import 'models/device_state.dart';
 import 'models/score_state.dart';
@@ -88,7 +89,10 @@ class WebsocketService {
 
     switch (type) {
       case 'score_update':
-        _ref.read(scoreProvider.notifier).applyRemote(ScoreState.fromJson(data));
+        final remote = ScoreState.fromJson(data);
+        if (_ref.read(scoreSyncProvider).acceptCableScore(remote)) {
+          _ref.read(scoreProvider.notifier).applyRemote(remote);
+        }
         break;
       case 'device_state':
         _ref
@@ -109,6 +113,14 @@ class WebsocketService {
           _ref.read(sessionProvider.notifier).applyCommand(action);
         }
         break;
+      case 'stream_event':
+        final event = data['event'] as String?;
+        if (event == 'paused') {
+          _ref.read(sessionProvider.notifier).applyCommand('pause_stream');
+        } else if (event == 'resumed') {
+          _ref.read(sessionProvider.notifier).applyCommand('resume_stream');
+        }
+        break;
       default:
         break;
     }

mobile/lib/shared/widgets/live_score_controls.dart

@@ -1,10 +1,12 @@
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../../app/theme.dart';
 import '../../features/shared/live_score_actions.dart';
 import '../../providers/score_provider.dart';
-import '../websocket_service.dart';
+import '../../providers/score_sync_provider.dart';
 import 'score_overlay_bar.dart';
 
 /// Tabellone interattivo: aggiorna punteggio via WebSocket (senza link regia).
@@ -27,8 +29,8 @@ class LiveScoreControls extends ConsumerWidget {
   final Future<void> Function()? onStopStream;
 
   void _sync(WidgetRef ref) {
-    if (!ref.read(websocketServiceProvider).isConnected) return;
-    ref.read(websocketServiceProvider).sendScoreUpdate(ref.read(scoreProvider));
+    // HTTP serializzato; il server fa broadcast WebSocket. Pagina live = status.json.
+    unawaited(ref.read(scoreSyncProvider).push());
   }
 
   Future<void> _pointHome(BuildContext context, WidgetRef ref) async {