markdown support for talk messages

test/view/talk/markdown_plain_text_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/view/pages/talk/data/talk_markdown.dart';
+
+void main() {
+  group('markdownToPlainText', () {
+    test('strips emphasis markers', () {
+      expect(
+        markdownToPlainText('**bold** and _italic_ and ~~struck~~'),
+        'bold and italic and struck',
+      );
+    });
+
+    test('drops heading markers', () {
+      expect(markdownToPlainText('# Title'), 'Title');
+    });
+
+    test('reduces links to their label and images to their alt text', () {
+      expect(markdownToPlainText('see [the docs](https://x.y)'), 'see the docs');
+      expect(markdownToPlainText('![a cat](https://x.y/c.png)'), 'a cat');
+    });
+
+    test('flattens lists into one space-separated line', () {
+      expect(markdownToPlainText('- one\n- two\n- three'), 'one two three');
+    });
+
+    test('unwraps inline code without the backticks', () {
+      expect(markdownToPlainText('run `flutter test` now'), 'run flutter test now');
+    });
+
+    test('keeps plain text unchanged', () {
+      expect(markdownToPlainText('just a normal sentence.'), 'just a normal sentence.');
+    });
+
+    test('leaves literal angle brackets intact (no HTML interpretation)', () {
+      expect(markdownToPlainText('a <b>tag</b>'), 'a <b>tag</b>');
+    });
+  });
+}