implemented dual Nextcloud push registration with separate general and talk apptypes to ensure reliable Talk notification delivery; introduced stacked MessagingStyle notifications for chat threads with support for circular conversation avatars and disk caching

test/push/talk_subject_parse_test.dart

@@ -0,0 +1,59 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/push/push_subject.dart';
+
+void main() {
+  group('parseTalkSubject', () {
+    test('1:1 chat: "{user}\\n{message}"', () {
+      final parsed = parseTalkSubject('Max Mustermann\nHallo zusammen');
+      expect(parsed.sender, 'Max Mustermann');
+      expect(parsed.roomName, isNull);
+      expect(parsed.text, 'Hallo zusammen');
+    });
+
+    test('group chat: "{user} in {call}\\n{message}" (de identical)', () {
+      final parsed = parseTalkSubject('Max in Projektraum\nHallo');
+      expect(parsed.sender, 'Max');
+      expect(parsed.roomName, 'Projektraum');
+      expect(parsed.text, 'Hallo');
+    });
+
+    test('sender containing " in " splits at the LAST separator', () {
+      final parsed = parseTalkSubject('Max in the Middle in Raum X\nHi');
+      expect(parsed.sender, 'Max in the Middle');
+      expect(parsed.roomName, 'Raum X');
+      expect(parsed.text, 'Hi');
+    });
+
+    test('legacy ": " separator still works as fallback', () {
+      final parsed = parseTalkSubject('Max: Hallo');
+      expect(parsed.sender, 'Max');
+      expect(parsed.roomName, isNull);
+      expect(parsed.text, 'Hallo');
+    });
+
+    test('legacy group form "Sender in Raum: msg"', () {
+      final parsed = parseTalkSubject('Max in Raum: Hallo');
+      expect(parsed.sender, 'Max');
+      expect(parsed.roomName, 'Raum');
+      expect(parsed.text, 'Hallo');
+    });
+
+    test('no separator falls back to a generic sender', () {
+      final parsed = parseTalkSubject(
+        'Max hat eine Nachricht in der Unterhaltung Raum gesendet',
+      );
+      expect(parsed.sender, 'Talk');
+      expect(parsed.roomName, isNull);
+      expect(
+        parsed.text,
+        'Max hat eine Nachricht in der Unterhaltung Raum gesendet',
+      );
+    });
+
+    test('multiline message keeps newlines after the first', () {
+      final parsed = parseTalkSubject('Max\nZeile 1\nZeile 2');
+      expect(parsed.sender, 'Max');
+      expect(parsed.text, 'Zeile 1\nZeile 2');
+    });
+  });
+}