Polish Telegram login screen

lib/screens/mapflow_shell.dart

@@ -151,17 +151,17 @@ class _UserAvatar extends StatelessWidget {
 
     return Padding(
       padding: const EdgeInsets.only(left: 12, top: 8),
-      child: CircleAvatar(
-        radius: 22,
-        backgroundColor: const Color(0xFFFFFBF5),
-        foregroundColor: const Color(0xFF17211D),
-        backgroundImage: photoUrl == null ? null : NetworkImage(photoUrl),
-        child: photoUrl == null
-            ? Text(
-                fallback,
-                style: const TextStyle(fontWeight: FontWeight.w900),
-              )
-            : null,
+      child: ClipOval(
+        child: SizedBox.square(
+          dimension: 44,
+          child: photoUrl == null || photoUrl.isEmpty
+              ? _AvatarFallback(text: fallback)
+              : Image.network(
+                  photoUrl,
+                  fit: BoxFit.cover,
+                  errorBuilder: (_, _, _) => _AvatarFallback(text: fallback),
+                ),
+        ),
       ),
     );
   }
@@ -181,6 +181,28 @@ class _UserAvatar extends StatelessWidget {
   }
 }
 
+class _AvatarFallback extends StatelessWidget {
+  const _AvatarFallback({required this.text});
+
+  final String text;
+
+  @override
+  Widget build(BuildContext context) {
+    return ColoredBox(
+      color: const Color(0xFFFFFBF5),
+      child: Center(
+        child: Text(
+          text,
+          style: const TextStyle(
+            color: Color(0xFF17211D),
+            fontWeight: FontWeight.w900,
+          ),
+        ),
+      ),
+    );
+  }
+}
+
 class _TelegramLoginScreen extends StatefulWidget {
   const _TelegramLoginScreen({required this.onAuthenticated});
 
@@ -193,6 +215,8 @@ class _TelegramLoginScreen extends StatefulWidget {
 class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
   final _api = MapflowApi();
   Timer? _pollTimer;
+  Timer? _countdownTimer;
+  DateTime? _loginExpiresAt;
   var _loading = false;
   var _message = '';
 
@@ -216,6 +240,7 @@ class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
   @override
   void dispose() {
     _pollTimer?.cancel();
+    _countdownTimer?.cancel();
     super.dispose();
   }
 
@@ -228,13 +253,20 @@ class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
     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(() {});
+      }
+    });
     setState(() {
       _loading = false;
-      _message = 'Подтверди вход в боте.';
+      _loginExpiresAt = login.expiresAt;
+      _message = '';
     });
   }
 
@@ -242,10 +274,12 @@ class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
     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;
     }
@@ -255,12 +289,27 @@ class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
     }
 
     _pollTimer?.cancel();
+    _countdownTimer?.cancel();
     telegram_session.saveMapflowSessionToken(status.sessionToken!);
     telegram_session.clearPendingTelegramLoginToken();
     widget.onAuthenticated();
     telegram_session.reloadApp();
   }
 
+  String get _remainingText {
+    final expiresAt = _loginExpiresAt;
+    if (expiresAt == null) {
+      return '';
+    }
+    final seconds = expiresAt.difference(DateTime.now()).inSeconds;
+    if (seconds <= 0) {
+      return '00:00';
+    }
+    final minutes = seconds ~/ 60;
+    final rest = (seconds % 60).toString().padLeft(2, '0');
+    return '$minutes:$rest';
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -280,6 +329,16 @@ class _TelegramLoginScreenState extends State<_TelegramLoginScreen> {
                 ),
                 const SizedBox(height: 24),
                 TelegramLoginButton(onPressed: _startLogin, loading: _loading),
+                if (_remainingText.isNotEmpty) ...[
+                  const SizedBox(height: 12),
+                  Text(
+                    _remainingText,
+                    style: Theme.of(context).textTheme.titleMedium?.copyWith(
+                      fontWeight: FontWeight.w800,
+                      letterSpacing: 0,
+                    ),
+                  ),
+                ],
                 if (_message.isNotEmpty) ...[
                   const SizedBox(height: 14),
                   Text(