implemented a new telemetry heartbeat and client-side error reporting system for MarianumConnect; replaced legacy mhsl.eu user index updates with a POST me/telemetry heartbeat using stable, securely-stored device identifiers; integrated global Flutter and platform error handlers to report uncaught exceptions with session-based deduplication and rate limiting.

lib/main.dart

@@ -21,6 +21,7 @@ import 'api/marianumcloud/webdav/queries/list_files/list_files_cache.dart';
 import 'api/marianumconnect/auth/session_validator.dart';
 import 'api/marianumconnect/marianumconnect_endpoint.dart';
 import 'api/marianumconnect/queries/get_breakers/get_breakers_response.dart';
+import 'api/marianumconnect/queries/report_client_error/client_error_reporter.dart';
 import 'app.dart';
 import 'background/widget_background_task.dart';
 import 'firebase_options.dart';
@@ -157,17 +158,17 @@ Future<void> main() async {
     );
   }
 
-  // Capture uncaught Flutter and platform errors so they show up in logs
-  // instead of being silently swallowed.
   FlutterError.onError = (details) {
     log(
       'Uncaught Flutter error: ${details.exception}',
       stackTrace: details.stack,
     );
+    ClientErrorReporter.reportFlutterError(details);
     FlutterError.presentError(details);
   };
   PlatformDispatcher.instance.onError = (error, stack) {
     log('Uncaught platform error: $error', stackTrace: stack);
+    ClientErrorReporter.reportPlatformError(error, stack);
     return true;
   };