consolidated downloads dir, nextcloud origin, upload route and chat timestamps; added webdav path tests

test/view/files/webdav_path_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:marianum_mobile/view/pages/files/data/webdav_path.dart';
+
+void main() {
+  group('webdavSegmentsOf', () {
+    test('root is empty', () {
+      expect(webdavSegmentsOf(''), isEmpty);
+      expect(webdavSegmentsOf('/'), isEmpty);
+    });
+
+    test('strips edge slashes of folders and files', () {
+      expect(webdavSegmentsOf('a/b/'), ['a', 'b']);
+      expect(webdavSegmentsOf('/a/b/c.txt'), ['a', 'b', 'c.txt']);
+    });
+  });
+
+  group('webdavParentSegmentsOf', () {
+    test('drops the last segment', () {
+      expect(webdavParentSegmentsOf('a/b/c.txt'), ['a', 'b']);
+      expect(webdavParentSegmentsOf('a/'), isEmpty);
+    });
+
+    test('root has no parent', () {
+      expect(webdavParentSegmentsOf(''), isEmpty);
+    });
+  });
+
+  test('webdavFolderPath ends folders with a slash, root stays empty', () {
+    expect(webdavFolderPath(const []), '');
+    expect(webdavFolderPath(const ['a', 'b']), 'a/b/');
+  });
+
+  test('webdavJoin marks directories with a trailing slash', () {
+    expect(webdavJoin('a/', 'b', isDirectory: true), 'a/b/');
+    expect(webdavJoin('', 'c.txt', isDirectory: false), 'c.txt');
+  });
+
+  test('listFilesCacheKey maps root to a single slash', () {
+    expect(listFilesCacheKey(const []), '/');
+    expect(listFilesCacheKey(const ['a', 'b']), 'a/b');
+  });
+
+  test('folder path round-trips through segments', () {
+    const segments = ['Schule', 'Mathe'];
+    expect(webdavSegmentsOf(webdavFolderPath(segments)), segments);
+  });
+}