fix(wallet): 丢弃切换账号后返回的旧余额响应

lib/core/data/services/wallet_controller.dart

@@ -21,23 +21,29 @@ class WalletController extends ChangeNotifier {
   String? unlockError;
   String? unlockingEpisodeId;
   bool _disposed = false;
+  int _requestSeq = 0;
 
   int get balance => snapshot?.wallet.coinBalance ?? 0;
   List<CoinLedgerEntry> get ledger => snapshot?.ledger ?? const [];
 
   Future<void> load() async {
+    if (_disposed) return;
+    final request = ++_requestSeq;
     loading = true;
     error = null;
     _notify();
     try {
-      snapshot = await _repository.fetchWallet();
+      final result = await _repository.fetchWallet();
+      if (_isCurrent(request)) snapshot = result;
     } on ApiException catch (exception) {
-      error = exception.message;
+      if (_isCurrent(request)) error = exception.message;
     } catch (_) {
-      error = 'walletLoadFailed';
+      if (_isCurrent(request)) error = 'walletLoadFailed';
     } finally {
-      loading = false;
-      _notify();
+      if (_isCurrent(request)) {
+        loading = false;
+        _notify();
+      }
     }
   }
 
@@ -75,6 +81,7 @@ class WalletController extends ChangeNotifier {
   }
 
   void reset() {
+    _requestSeq += 1;
     snapshot = null;
     loading = false;
     unlocking = false;
@@ -88,6 +95,8 @@ class WalletController extends ChangeNotifier {
     if (!_disposed) notifyListeners();
   }
 
+  bool _isCurrent(int request) => !_disposed && request == _requestSeq;
+
   @override
   void dispose() {
     _disposed = true;