Complete Telegram bot login from callback URL

lib/screens/mapflow_shell.dart

@@ -297,7 +297,6 @@ class _TelegramLoginScreen extends StatefulWidget {
 
 class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
   final _api = MapflowApi();
-  Timer? _pollTimer;
   Timer? _countdownTimer;
   DateTime? _loginExpiresAt;
   var _loading = false;
@@ -307,22 +306,13 @@ class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
   void initState() {
     super.initState();
     final urlToken = telegram_session.telegramLoginTokenFromUrl();
-    final pendingToken = urlToken.isNotEmpty
-        ? urlToken
-        : telegram_session.pendingTelegramLoginToken();
-    if (pendingToken.isNotEmpty) {
-      telegram_session.savePendingTelegramLoginToken(pendingToken);
-      _pollLogin(pendingToken);
-      _pollTimer = Timer.periodic(
-        const Duration(seconds: 2),
-        (_) => _pollLogin(pendingToken),
-      );
+    if (urlToken.isNotEmpty) {
+      _completeLogin(urlToken);
     }
   }
 
   @override
   void dispose() {
-    _pollTimer?.cancel();
     _countdownTimer?.cancel();
     super.dispose();
   }
@@ -333,14 +323,8 @@ class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
       _message = '';
     });
     final login = await _api.startTelegramBotLogin();
-    telegram_session.savePendingTelegramLoginToken(login.token);
     telegram_session.openExternalUrl(login.botUrl);
-    _pollTimer?.cancel();
     _countdownTimer?.cancel();
-    _pollTimer = Timer.periodic(
-      const Duration(seconds: 2),
-      (_) => _pollLogin(login.token),
-    );
     _countdownTimer = Timer.periodic(const Duration(seconds: 1), (_) {
       if (mounted) {
         setState(() {});
@@ -353,28 +337,14 @@ class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
     });
   }
 
-  Future<void> _pollLogin(String token) async {
-    final status = await _api.fetchTelegramBotLoginStatus(token);
-    if (status.isExpired) {
-      _pollTimer?.cancel();
-      _countdownTimer?.cancel();
-      telegram_session.clearPendingTelegramLoginToken();
-      if (!mounted) {
-        return;
-      }
-      _loginExpiresAt = null;
-      setState(() => _message = 'Ссылка устарела. Запусти вход заново.');
-      return;
-    }
-
-    if (!status.isConfirmed) {
-      return;
-    }
-
-    _pollTimer?.cancel();
+  Future<void> _completeLogin(String token) async {
+    setState(() {
+      _loading = true;
+      _message = '';
+    });
+    final session = await _api.completeTelegramBotLogin(token);
     _countdownTimer?.cancel();
-    telegram_session.saveMapflowSessionToken(status.sessionToken!);
-    telegram_session.clearPendingTelegramLoginToken();
+    telegram_session.saveMapflowSessionToken(session.sessionToken);
     widget.onAuthenticated();
     telegram_session.reloadApp();
   }