added support for multiple accounts, guardian login bugfixes, ui changes

lib/share_intent/share_intent_listener.dart

@@ -4,6 +4,7 @@ import 'dart:io';
 import 'package:flutter/foundation.dart';
 import 'package:receive_sharing_intent/receive_sharing_intent.dart';
 
+import '../auth_link/guardian_login_link.dart';
 import 'pending_share.dart';
 
 /// Bridges native share intents (Android ACTION_SEND, iOS Share Extension)
@@ -39,8 +40,7 @@ class ShareIntentListener {
         final share = _toPendingShare(items);
         if (share != null) _publish(share);
       },
-      onError: (Object e) =>
-          debugPrint('ShareIntentListener stream error: $e'),
+      onError: (Object e) => debugPrint('ShareIntentListener stream error: $e'),
     );
   }
 
@@ -87,6 +87,16 @@ class ShareIntentListener {
     unawaited(ReceiveSharingIntent.instance.reset());
   }
 
+  /// Android hands an opened App Link (guardian login mail) to the share
+  /// plugin as a shared URL too; it belongs to [GuardianLinkListener] only.
+  @visibleForTesting
+  static bool isAppLink(String value) {
+    final uri = Uri.tryParse(value.trim());
+    return uri != null &&
+        uri.hasScheme &&
+        uri.path.endsWith(GuardianLoginLink.path);
+  }
+
   PendingShare? _toPendingShare(List<SharedMediaFile> items) {
     if (items.isEmpty) return null;
     final files = <String>[];
@@ -99,7 +109,7 @@ class ShareIntentListener {
           files.add(item.path);
         case SharedMediaType.text:
         case SharedMediaType.url:
-          texts.add(item.path);
+          if (!isAppLink(item.path)) texts.add(item.path);
       }
     }
     if (files.isEmpty && texts.isEmpty) return null;