feat: auto close login browser

lib/screens/auth_screen.dart

@@ -15,6 +15,7 @@ class _AuthScreenState extends State<AuthScreen> {
   bool _isAuthenticating = false;
   String? _errorMessage;
   late PlexAuthService _authService;
+  bool _shouldCancelPolling = false;
 
   @override
   void initState() {
@@ -30,6 +31,7 @@ class _AuthScreenState extends State<AuthScreen> {
     setState(() {
       _isAuthenticating = true;
       _errorMessage = null;
+      _shouldCancelPolling = false;
     });
 
     try {
@@ -49,8 +51,16 @@ class _AuthScreenState extends State<AuthScreen> {
         throw Exception('Could not launch auth URL');
       }
 
-      // Poll for authentication
-      final token = await _authService.pollPinUntilClaimed(pinId);
+      // Poll for authentication with cancellation support
+      final token = await _authService.pollPinUntilClaimed(
+        pinId,
+        shouldCancel: () => _shouldCancelPolling,
+      );
+
+      // If polling was cancelled, don't show error
+      if (_shouldCancelPolling) {
+        return;
+      }
 
       if (token == null) {
         setState(() {
@@ -60,6 +70,13 @@ class _AuthScreenState extends State<AuthScreen> {
         return;
       }
 
+      // Auto-close the in-app browser on mobile (no-op on desktop)
+      try {
+        await closeInAppWebView();
+      } catch (e) {
+        // Ignore errors - browser might already be closed or on desktop
+      }
+
       // Store the token
       final storage = await StorageService.getInstance();
       await storage.savePlexToken(token);
@@ -84,6 +101,15 @@ class _AuthScreenState extends State<AuthScreen> {
     }
   }
 
+  void _retryAuthentication() {
+    setState(() {
+      _shouldCancelPolling = true;
+      _isAuthenticating = false;
+    });
+    // Start new authentication after a brief delay to ensure cleanup
+    Future.delayed(const Duration(milliseconds: 100), _startAuthentication);
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -117,6 +143,14 @@ class _AuthScreenState extends State<AuthScreen> {
                   textAlign: TextAlign.center,
                   style: TextStyle(color: Colors.grey),
                 ),
+                const SizedBox(height: 24),
+                OutlinedButton(
+                  onPressed: _retryAuthentication,
+                  style: OutlinedButton.styleFrom(
+                    padding: const EdgeInsets.symmetric(vertical: 12, horizontal: 24),
+                  ),
+                  child: const Text('Retry'),
+                ),
               ] else ...[
                 ElevatedButton(
                   onPressed: _startAuthentication,

lib/services/plex_auth_service.dart

@@ -109,11 +109,17 @@ class PlexAuthService {
   /// Poll the PIN until it's claimed or timeout
   Future<String?> pollPinUntilClaimed(
     int pinId, {
-    Duration timeout = const Duration(minutes: 5),
+    Duration timeout = const Duration(minutes: 2),
+    bool Function()? shouldCancel,
   }) async {
     final endTime = DateTime.now().add(timeout);
 
     while (DateTime.now().isBefore(endTime)) {
+      // Check if polling should be cancelled
+      if (shouldCancel != null && shouldCancel()) {
+        return null;
+      }
+
       final token = await checkPin(pinId);
       if (token != null) {
         return token;