multiple runtime bugfixes for 1.5.5+65

lib/routing/app_routes.dart

@@ -4,7 +4,6 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:persistent_bottom_nav_bar_v2/persistent_bottom_nav_bar_v2.dart';
-import 'package:url_launcher/url_launcher_string.dart';
 
 import '../api/marianumcloud/talk/room/get_room_response.dart';
 import '../api/marianumconnect/marianumconnect_endpoint.dart';
@@ -18,6 +17,7 @@ import '../state/app/modules/app_modules.dart';
 import '../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../state/app/modules/chat_list/bloc/chat_list_bloc.dart';
 import '../state/app/modules/marianum_message/bloc/marianum_message_state.dart';
+import '../utils/url_opener.dart';
 import '../view/login/nextcloud_login_flow_page.dart';
 import '../view/pages/files/files.dart';
 import '../view/pages/files/sharing/sharee_picker_page.dart';
@@ -228,7 +228,7 @@ class AppRoutes {
       openTickerPage(context, slug: slug);
       return;
     }
-    unawaited(openExternalUrl(href));
+    unawaited(UrlOpener.openUrl(href));
   }
 
   /// Extracts the ticker page slug from a link that points at another ticker
@@ -250,24 +250,13 @@ class AppRoutes {
     return Uri.decodeComponent(rest);
   }
 
-  /// Launches an external URL, restricted to safe schemes (http/https/mailto/tel).
-  static Future<void> openExternalUrl(String url) async {
-    final uri = Uri.tryParse(url);
-    if (uri == null) return;
-    const allowed = {'http', 'https', 'mailto', 'tel'};
-    if (!allowed.contains(uri.scheme.toLowerCase())) return;
-    if (await canLaunchUrlString(url)) {
-      await launchUrlString(url, mode: LaunchMode.externalApplication);
-    }
-  }
-
   /// Opens a possibly site-relative web URL (e.g. the ticker `webUrl`) by
   /// prefixing the active Marianum-Connect base URL when needed.
   static Future<void> openWebUrl(String relativeOrAbsolute) {
     if (relativeOrAbsolute.startsWith('http')) {
-      return openExternalUrl(relativeOrAbsolute);
+      return UrlOpener.openUrl(relativeOrAbsolute);
     }
-    return openExternalUrl(
+    return UrlOpener.openUrl(
       '${MarianumConnectEndpoint.current()}$relativeOrAbsolute',
     );
   }