Stabilizza live YouTube/RTMP e fix crash rotazione mobile.

Pipeline YouTube con relay, overlay e publisher sync lato backend; fix GL pauseGlDuringRotation su Android per evitare crash in rotazione durante lo streaming Flutter.

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

mobile/lib/providers/auth_provider.dart

@@ -1,7 +1,9 @@
+import 'package:dio/dio.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../core/auth_storage.dart';
 import '../core/team_selection_storage.dart';
+import '../shared/api_client.dart';
 import '../shared/models/user.dart';
 
 class AuthState {
@@ -72,6 +74,53 @@ class AuthNotifier extends StateNotifier<AuthState> {
     );
   }
 
+  /// Dopo restore: verifica token o rinnova con refresh (evita 401 su /teams).
+  Future<bool> validateOrRefreshSession() async {
+    if (!state.isAuthenticated) return false;
+
+    final client = ApiClient(accessToken: state.accessToken);
+    try {
+      final user = await client.me();
+      state = state.copyWith(user: user);
+      await AuthStorage.save(
+        user: user,
+        accessToken: state.accessToken!,
+        refreshToken: state.refreshToken!,
+      );
+      return true;
+    } on DioException catch (e) {
+      if (e.response?.statusCode != 401) {
+        return true;
+      }
+    } catch (_) {
+      return true;
+    }
+
+    return refreshSession();
+  }
+
+  Future<bool> refreshSession() async {
+    final refreshToken = state.refreshToken;
+    if (refreshToken == null || refreshToken.isEmpty) {
+      logout();
+      return false;
+    }
+
+    try {
+      final client = ApiClient();
+      final result = await client.refreshSession(refreshToken);
+      setSession(
+        user: result.user,
+        accessToken: result.tokens.accessToken,
+        refreshToken: result.tokens.refreshToken,
+      );
+      return true;
+    } catch (_) {
+      logout();
+      return false;
+    }
+  }
+
   void setLoading(bool loading) {
     state = state.copyWith(loading: loading, clearError: true);
   }

mobile/lib/providers/session_provider.dart

@@ -44,7 +44,12 @@ class SessionNotifier extends StateNotifier<SessionState> {
   SessionNotifier() : super(const SessionState());
 
   void setSession(StreamSession session, {MatchModel? match}) {
-    state = state.copyWith(session: session, match: match);
+    final prevId = state.session?.id;
+    state = state.copyWith(
+      session: session,
+      match: match,
+      elapsed: prevId != null && prevId != session.id ? Duration.zero : state.elapsed,
+    );
   }
 
   void updateYoutubeLinks({
@@ -111,8 +116,6 @@ class SessionNotifier extends StateNotifier<SessionState> {
         state = state.copyWith(cameraDevice: device);
         return;
       }
-      final startedAt = s.startedAt ??
-          ((incoming == 'live' || incoming == 'reconnecting') ? DateTime.now() : null);
       state = state.copyWith(
         session: StreamSession(
           id: s.id,
@@ -129,7 +132,7 @@ class SessionNotifier extends StateNotifier<SessionState> {
           privacyStatus: s.privacyStatus,
           qualityPreset: s.qualityPreset,
           targetBitrate: s.targetBitrate,
-          startedAt: startedAt,
+          startedAt: s.startedAt,
           disconnectionCount: s.disconnectionCount,
           score: s.score,
           devices: s.devices,