feat(catalog): review fixes for catalog search

Word limit and no-retry state for rejected input, nested /catalog route for
system back, logger filter for supabase libs, more mutation-proof tests,
doc fix, umlaut-aware term sorting, thousands separators. Refs #3

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/lib/core/logging/app_logger.dart

@@ -48,7 +48,17 @@ class AppLogger {
     _subscription = null;
   }
 
+  /// Whether a record is written. Records of the Supabase libraries below
+  /// INFO are dropped: postgrest logs `'$error from request'` at FINE, and the
+  /// error text can echo request parameters (search terms, QUE-04).
+  @visibleForTesting
+  static bool shouldWrite(LogRecord record) =>
+      !(record.loggerName.startsWith('supabase') && record.level < Level.INFO);
+
   static void _write(LogRecord record) {
+    if (!shouldWrite(record)) {
+      return;
+    }
     developer.log(
       record.message,
       time: record.time,

app/lib/core/routing/app_router.dart

@@ -24,9 +24,9 @@ GoRouter appRouter(Ref ref) {
       GoRoute(
         path: AppRoutes.home,
         builder: (context, state) => const HomeScreen(),
+        routes: catalogRoutes,
       ),
       ...authRoutes,
-      ...catalogRoutes,
     ],
   );
   ref.onDispose(router.dispose);

app/lib/core/routing/app_router.g.dart

@@ -48,4 +48,4 @@ final class AppRouterProvider
   }
 }
 
-String _$appRouterHash() => r'e5b9cf23cd96b28b8941552d226d592a1e06efc1';
+String _$appRouterHash() => r'cb20752ab64cf1ac56d3bfce5401e187246f5ec7';

app/lib/core/routing/app_routes.dart

@@ -5,6 +5,9 @@ abstract final class AppRoutes {
   /// Katalogsuche, öffentlich (Spec #3 § 5.5).
   static const catalog = '/catalog';
 
+  /// Segment of [catalog] below [home] (nested route).
+  static const catalogSegment = 'catalog';
+
   // Auth (Spec #1 § 5.3)
   static const login = '/login';
   static const register = '/register';

app/lib/core/widgets/app_list_footer.dart

@@ -18,7 +18,6 @@ class AppListFooter extends StatelessWidget {
     required this.onRetry,
     super.key,
     this.errorMessage,
-    this.loadMoreFocusNode,
   });
 
   final bool isLoading;
@@ -32,10 +31,6 @@ class AppListFooter extends StatelessWidget {
   final VoidCallback onLoadMore;
   final VoidCallback onRetry;
 
-  /// Focus node of the "load more" button (callers restore focus elsewhere
-  /// after loading).
-  final FocusNode? loadMoreFocusNode;
-
   @override
   Widget build(BuildContext context) {
     final message = errorMessage;
@@ -79,7 +74,6 @@ class AppListFooter extends StatelessWidget {
     } else if (hasMore) {
       content = OutlinedButton(
         key: const Key('list_footer_load_more'),
-        focusNode: loadMoreFocusNode,
         onPressed: onLoadMore,
         child: Text(loadMoreLabel),
       );

app/lib/features/catalog/domain/catalog_search_query.dart

@@ -19,6 +19,9 @@ abstract final class CatalogSearchLimits {
   /// "Suitable from X years" steps.
   static const List<int> ageSteps = [6, 8, 10, 12, 14, 16, 18];
 
+  /// The backend rejects search texts with more words.
+  static const int maxWords = 10;
+
   /// Most genres or mechanics that can be selected at once.
   static const int maxTerms = 20;
 
@@ -77,12 +80,25 @@ abstract class CatalogSearchQuery with _$CatalogSearchQuery {
 
   const CatalogSearchQuery._();
 
-  /// Trims [raw] and cuts it to the maximum length.
+  static final RegExp _word = RegExp(r'[\p{L}\p{N}]+', unicode: true);
+
+  /// Trims [raw] and cuts it to the maximum length and to at most
+  /// [CatalogSearchLimits.maxWords] words. The backend counts words after its
+  /// normalization (punctuation separates words, one-letter words count) and
+  /// rejects more; this is the client-side approximation, the rest is cut off
+  /// silently.
   static String cleanText(String raw) {
-    final trimmed = raw.trim();
+    var text = raw.trim();
-    return trimmed.length > CatalogSearchLimits.maxTextLength
+    if (text.length > CatalogSearchLimits.maxTextLength) {
-        ? trimmed.substring(0, CatalogSearchLimits.maxTextLength).trim()
+      text = text.substring(0, CatalogSearchLimits.maxTextLength).trim();
-        : trimmed;
+    }
+    var count = 0;
+    for (final match in _word.allMatches(text)) {
+      if (++count == CatalogSearchLimits.maxWords) {
+        return text.substring(0, match.end);
+      }
+    }
+    return text;
   }
 
   /// Whether the text is long enough to count as a search term.

app/lib/features/catalog/presentation/catalog_routes.dart

@@ -4,9 +4,14 @@ import 'package:shuffle/features/catalog/presentation/catalog_query_params.dart'
 import 'package:shuffle/features/catalog/presentation/search/catalog_search_screen.dart';
 
 /// Routes of the catalog (Spec #3 § 5.5). `/catalog` is public.
+///
+/// These are sub-routes of the start page (path `catalog` below `/`), so the
+/// URL stays `/catalog`, but a deep link builds the stack [home, catalog] and
+/// the system back button (Android) returns to the start page instead of
+/// closing the app.
 final List<RouteBase> catalogRoutes = [
   GoRoute(
-    path: AppRoutes.catalog,
+    path: AppRoutes.catalogSegment,
     builder: (context, state) => CatalogSearchScreen(
       initialQuery: parseCatalogQuery(state.uri.queryParameters),
     ),

app/lib/features/catalog/presentation/search/catalog_search_view.dart

@@ -424,19 +424,25 @@ class _CatalogSearchViewState extends ConsumerState<CatalogSearchView> {
           ),
         );
       case CatalogSearchStatus.error:
-        final offline = state.failure is CatalogNetworkFailure;
+        final failure = state.failure;
+        final offline = failure is CatalogNetworkFailure;
+        // Rejected input does not get better by repeating it: no retry.
+        final invalid = failure is CatalogInvalidInputFailure;
         return AppStateMessage(
           key: const Key('catalog_error'),
           icon: offline ? Icons.wifi_off : Icons.error_outline,
           title: offline
               ? l10n.catalogSearchErrorOffline
+              : invalid
+              ? l10n.catalogSearchErrorInvalid
               : l10n.catalogSearchErrorGeneric,
           actions: [
-            AppStateAction(
+            if (!invalid)
-              key: const Key('catalog_error_retry'),
+              AppStateAction(
-              label: l10n.catalogSearchRetry,
+                key: const Key('catalog_error_retry'),
-              onPressed: () => unawaited(_controller.retry()),
+                label: l10n.catalogSearchRetry,
-            ),
+                onPressed: () => unawaited(_controller.retry()),
+              ),
           ],
         );
       case CatalogSearchStatus.empty:

app/lib/features/catalog/presentation/search/widgets/catalog_filter_panel.dart

@@ -174,10 +174,9 @@ class _TermChoice extends StatelessWidget {
       data: (list) {
         final sorted = [...list]
           ..sort(
-            (a, b) => a
+            (a, b) =>
-                .localizedName(language)
+                _sortKey(a.localizedName(language))
-                .toLowerCase()
+                    .compareTo(_sortKey(b.localizedName(language))),
-                .compareTo(b.localizedName(language).toLowerCase()),
           );
         final full = selected.length >= CatalogSearchLimits.maxTerms;
         return Wrap(
@@ -239,3 +238,33 @@ class _TermChoice extends StatelessWidget {
     );
   }
 }
+
+/// Sort key that puts umlauts and accents next to their base letters.
+String _sortKey(String name) {
+  const map = {
+    'ä': 'a',
+    'ö': 'o',
+    'ü': 'u',
+    'ß': 'ss',
+    'é': 'e',
+    'è': 'e',
+    'ê': 'e',
+    'á': 'a',
+    'à': 'a',
+    'â': 'a',
+    'í': 'i',
+    'ó': 'o',
+    'ô': 'o',
+    'ú': 'u',
+    'ç': 'c',
+    'ñ': 'n',
+    'æ': 'ae',
+    'œ': 'oe',
+  };
+  final buffer = StringBuffer();
+  for (final rune in name.toLowerCase().runes) {
+    final char = String.fromCharCode(rune);
+    buffer.write(map[char] ?? char);
+  }
+  return buffer.toString();
+}

app/lib/l10n/app_de.arb

@@ -115,5 +115,6 @@
   "catalogSearchEmptyCatalog": "Der Katalog ist noch leer.",
   "catalogSearchReportGame": "Fehlendes Spiel melden",
   "catalogSearchErrorOffline": "Keine Verbindung. Für die Suche brauchst du Internet.",
-  "catalogSearchErrorGeneric": "Die Suche ist gerade nicht möglich."
+  "catalogSearchErrorGeneric": "Die Suche ist gerade nicht möglich.",
+  "catalogSearchErrorInvalid": "Diese Suche wird nicht unterstützt. Ändere den Suchbegriff oder die Filter."
 }

app/lib/l10n/app_en.arb

@@ -169,9 +169,9 @@
   "catalogSearchRetry": "Try again",
   "@catalogSearchRetry": {"description": "Retry button"},
   "catalogSearchResultCount": "{count, plural, =0{No games} =1{1 game} other{{count} games}}",
-  "@catalogSearchResultCount": {"description": "Number of hits above the list", "placeholders": {"count": {"type": "int"}}},
+  "@catalogSearchResultCount": {"description": "Number of hits above the list", "placeholders": {"count": {"type": "int", "format": "decimalPattern"}}},
   "catalogSearchAnnouncement": "{count, plural, =0{No games found} =1{1 game found} other{{count} games found}}",
-  "@catalogSearchAnnouncement": {"description": "Screen reader announcement after a finished search", "placeholders": {"count": {"type": "int"}}},
+  "@catalogSearchAnnouncement": {"description": "Screen reader announcement after a finished search", "placeholders": {"count": {"type": "int", "format": "decimalPattern"}}},
   "catalogSearchAlsoKnownAs": "also: {title}",
   "@catalogSearchAlsoKnownAs": {"description": "Alternative title that matched", "placeholders": {"title": {"type": "String"}}},
   "catalogSearchPlayersCount": "{count, plural, =1{1 player} other{{count} players}}",
@@ -205,5 +205,7 @@
   "catalogSearchErrorOffline": "No connection. You need internet for the search.",
   "@catalogSearchErrorOffline": {"description": "Error state: offline"},
   "catalogSearchErrorGeneric": "Search is not available right now.",
-  "@catalogSearchErrorGeneric": {"description": "Error state: other errors"}
+  "@catalogSearchErrorGeneric": {"description": "Error state: other errors"},
+  "catalogSearchErrorInvalid": "This search is not supported. Change the search text or the filters.",
+  "@catalogSearchErrorInvalid": {"description": "Error state: the backend rejected the input (no retry offered)"}
 }

app/lib/l10n/app_localizations.dart

@@ -793,6 +793,12 @@ abstract class AppLocalizations {
   /// In en, this message translates to:
   /// **'Search is not available right now.'**
   String get catalogSearchErrorGeneric;
+
+  /// Error state: the backend rejected the input (no retry offered)
+  ///
+  /// In en, this message translates to:
+  /// **'This search is not supported. Change the search text or the filters.'**
+  String get catalogSearchErrorInvalid;
 }
 
 class _AppLocalizationsDelegate

app/lib/l10n/app_localizations_de.dart

@@ -359,10 +359,14 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String catalogSearchResultCount(int count) {
+    final intl.NumberFormat countNumberFormat =
+        intl.NumberFormat.decimalPattern(localeName);
+    final String countString = countNumberFormat.format(count);
+
     String _temp0 = intl.Intl.pluralLogic(
       count,
       locale: localeName,
-      other: '$count Spiele',
+      other: '$countString Spiele',
       one: '1 Spiel',
       zero: 'Keine Spiele',
     );
@@ -371,10 +375,14 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String catalogSearchAnnouncement(int count) {
+    final intl.NumberFormat countNumberFormat =
+        intl.NumberFormat.decimalPattern(localeName);
+    final String countString = countNumberFormat.format(count);
+
     String _temp0 = intl.Intl.pluralLogic(
       count,
       locale: localeName,
-      other: '$count Spiele gefunden',
+      other: '$countString Spiele gefunden',
       one: '1 Spiel gefunden',
       zero: 'Keine Spiele gefunden',
     );
@@ -457,4 +465,8 @@ class AppLocalizationsDe extends AppLocalizations {
 
   @override
   String get catalogSearchErrorGeneric => 'Die Suche ist gerade nicht möglich.';
+
+  @override
+  String get catalogSearchErrorInvalid =>
+      'Diese Suche wird nicht unterstützt. Ändere den Suchbegriff oder die Filter.';
 }

app/lib/l10n/app_localizations_en.dart

@@ -355,10 +355,14 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String catalogSearchResultCount(int count) {
+    final intl.NumberFormat countNumberFormat =
+        intl.NumberFormat.decimalPattern(localeName);
+    final String countString = countNumberFormat.format(count);
+
     String _temp0 = intl.Intl.pluralLogic(
       count,
       locale: localeName,
-      other: '$count games',
+      other: '$countString games',
       one: '1 game',
       zero: 'No games',
     );
@@ -367,10 +371,14 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String catalogSearchAnnouncement(int count) {
+    final intl.NumberFormat countNumberFormat =
+        intl.NumberFormat.decimalPattern(localeName);
+    final String countString = countNumberFormat.format(count);
+
     String _temp0 = intl.Intl.pluralLogic(
       count,
       locale: localeName,
-      other: '$count games found',
+      other: '$countString games found',
       one: '1 game found',
       zero: 'No games found',
     );
@@ -451,4 +459,8 @@ class AppLocalizationsEn extends AppLocalizations {
 
   @override
   String get catalogSearchErrorGeneric => 'Search is not available right now.';
+
+  @override
+  String get catalogSearchErrorInvalid =>
+      'This search is not supported. Change the search text or the filters.';
 }

app/test/core/logging/app_logger_test.dart

@@ -29,4 +29,19 @@ void main() {
     expect(records.last.level, Level.SEVERE);
     expect(records.last.loggerName, 'Test');
   });
+
+  test('QUE-04: Supabase library records below INFO are not written', () {
+    expect(
+      AppLogger.shouldWrite(LogRecord(Level.FINE, 'x', 'supabase.postgrest')),
+      isFalse,
+    );
+    expect(
+      AppLogger.shouldWrite(LogRecord(Level.WARNING, 'x', 'supabase.auth')),
+      isTrue,
+    );
+    expect(
+      AppLogger.shouldWrite(LogRecord(Level.FINE, 'x', 'CatalogRepository')),
+      isTrue,
+    );
+  });
 }

app/test/core/widgets/app_state_message_test.dart

@@ -160,31 +160,5 @@ void main() {
       expect(find.byType(OutlinedButton), findsNothing);
       expect(find.byKey(const Key('list_footer_loading')), findsNothing);
     });
-
-    testWidgets('the load-more button takes a focus node', (tester) async {
-      final node = FocusNode();
-      addTearDown(node.dispose);
-      await pumpApp(
-        tester,
-        home: Scaffold(
-          body: AppListFooter(
-            isLoading: false,
-            hasMore: true,
-            loadingLabel: 'Lädt',
-            loadMoreLabel: 'Weitere laden',
-            retryLabel: 'Erneut versuchen',
-            onLoadMore: () {},
-            onRetry: () {},
-            loadMoreFocusNode: node,
-          ),
-        ),
-        settle: false,
-      );
-
-      node.requestFocus();
-      await tester.pump();
-
-      expect(node.hasPrimaryFocus, isTrue);
-    });
   });
 }

app/test/features/catalog/catalog_test_support.dart

@@ -16,6 +16,7 @@ import '../../helpers/fakes.dart';
 const genreStrategy = '11111111-1111-4111-8111-111111111111';
 const genreFamily = '22222222-2222-4222-8222-222222222222';
 const mechanicDice = '33333333-3333-4333-8333-333333333333';
+const mechanicCards = '44444444-4444-4444-8444-444444444444';
 
 const testGenres = [
   CatalogTerm(id: genreStrategy, nameDe: 'Strategie', nameEn: 'Strategy'),

app/test/features/catalog/data/supabase_catalog_repository_test.dart

@@ -126,6 +126,31 @@ void main() {
       expect(body(requests.single), isNot(contains('p_mechanic_ids')));
     });
 
+    test(
+      'KAT-01 Kriterium 4: several genre and mechanic IDs are all sent',
+      () async {
+        await repository.search(
+          const CatalogSearchQuery(
+            filters: CatalogFilters(
+              genreIds: {genreStrategy, genreFamily},
+              mechanicIds: {mechanicDice, mechanicCards},
+            ),
+          ),
+          offset: 0,
+        );
+
+        final sent = body(requests.single);
+        expect(
+          sent['p_genre_ids'],
+          unorderedEquals([genreStrategy, genreFamily]),
+        );
+        expect(
+          sent['p_mechanic_ids'],
+          unorderedEquals([mechanicDice, mechanicCards]),
+        );
+      },
+    );
+
     test('KAT-01 Kriterium 4: mechanics are sent as p_mechanic_ids', () async {
       await repository.search(
         const CatalogSearchQuery(
@@ -285,7 +310,7 @@ void main() {
       expect(result.errorOrNull, isA<CatalogUnexpectedFailure>());
     });
 
-    test('QUE-04: logs the failure kind, never the search text', () async {
+    test('QUE-04: the repository logger never logs the search text', () async {
       const secret = 'geheimer-suchbegriff';
       final records = <LogRecord>[];
       Logger.root.level = Level.ALL;
@@ -304,6 +329,17 @@ void main() {
         offset: 0,
       );
 
+      // Any other library may echo the text in its own debug logs (postgrest
+      // does at FINE); AppLogger drops those, so none of them is written.
+      for (final record in records.where(
+        (r) => '${r.message} ${r.error}'.contains(secret),
+      )) {
+        expect(
+          AppLogger.shouldWrite(record),
+          isFalse,
+          reason: '${record.loggerName} would write the search text',
+        );
+      }
       final catalog = records.where((r) => r.loggerName == 'CatalogRepository');
       expect(catalog, isNotEmpty);
       for (final record in catalog) {

app/test/features/catalog/domain/catalog_domain_test.dart

@@ -41,6 +41,35 @@ void main() {
       expect(CatalogSearchQuery.cleanText('a' * 150), hasLength(100));
     });
 
+    test(
+      'Eingabegrenzen: the text is cut to 10 words (rest dropped silently)',
+      () {
+        expect(
+          CatalogSearchQuery.cleanText('a b c d e f g h i j k l'),
+          'a b c d e f g h i j',
+        );
+        expect(
+          CatalogSearchQuery.cleanText('a b c d e f g h i j'),
+          'a b c d e f g h i j',
+        );
+        expect(CatalogSearchQuery.cleanText('a b c'), 'a b c');
+      },
+    );
+
+    test('Eingabegrenzen: punctuation separates words like in the backend', () {
+      // Hyphen and colon split words: 12 words, not 6.
+      expect(
+        CatalogSearchQuery.cleanText('a-b c:d e-f g-h i-j k-l'),
+        'a-b c:d e-f g-h i-j',
+      );
+      expect(
+        CatalogSearchQuery.cleanText(
+          'Æon’s End: Ünïcode Wörter ß 1 2 3 4 5 6 7',
+        ),
+        'Æon’s End: Ünïcode Wörter ß 1 2 3 4',
+      );
+    });
+
     test('KAT-01 Kriterium 4: activeFilterCount counts every filter value', () {
       const filters = CatalogFilters(
         players: 3,

app/test/features/catalog/presentation/search/catalog_search_behavior_test.dart

@@ -3,6 +3,7 @@ import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:shuffle/features/catalog/domain/catalog_failure.dart';
 import 'package:shuffle/features/catalog/domain/catalog_search_query.dart';
+import 'package:shuffle/features/catalog/domain/catalog_term.dart';
 
 import '../../catalog_test_support.dart';
 import 'catalog_search_test_support.dart';
@@ -142,6 +143,34 @@ void main() {
       expect(de, lessThan(de2));
     });
 
+    testWidgets('terms with umlauts sort next to their base letters', (
+      tester,
+    ) async {
+      final repository = FakeCatalogRepository(
+        all: [game(1)],
+        genres: const [
+          CatalogTerm(id: genreStrategy, nameDe: 'Zocken', nameEn: 'Z'),
+          CatalogTerm(id: genreFamily, nameDe: 'Ökonomie', nameEn: 'E'),
+          CatalogTerm(
+            id: '55555555-5555-4555-8555-555555555555',
+            nameDe: 'Party',
+            nameEn: 'P',
+          ),
+        ],
+      );
+      await pumpView(tester, repository);
+      await openFilterSheet(tester);
+
+      final party = tester.getTopLeft(find.text('Party'));
+      final oekonomie = tester.getTopLeft(find.text('Ökonomie'));
+      final zocken = tester.getTopLeft(find.text('Zocken'));
+      bool before(Offset a, Offset b) =>
+          a.dy < b.dy || (a.dy == b.dy && a.dx < b.dx);
+      // Ö sorts as O: Ökonomie, Party, Zocken.
+      expect(before(oekonomie, party), isTrue);
+      expect(before(party, zocken), isTrue);
+    });
+
     testWidgets('QUE-05 Kriterium 4: English names and order', (tester) async {
       final repository = FakeCatalogRepository(all: [game(1)]);
       await pumpView(tester, repository, locale: const Locale('en'));

app/test/features/catalog/presentation/search/catalog_search_controller_test.dart

@@ -302,6 +302,31 @@ void main() {
     expect(state().loadingMore, isFalse);
   });
 
+  run('KAT-01 Kriterium 5: a stale loadMore answer is not appended', (
+    tester,
+  ) async {
+    final repo = FakeCatalogRepository(manual: true);
+    useRepository(repo);
+    controller().init(const CatalogSearchQuery());
+    await tester.pump();
+    repo.complete(0, items: [game(1)], totalCount: 3);
+    await tester.pump();
+    unawaited(controller().loadMore());
+    await tester.pump();
+
+    // A new search starts while the next page is still on its way ...
+    controller().submitText('neu');
+    await tester.pump();
+    // ... and the old page arrives before the new answer.
+    repo.complete(1, items: [game(2), game(3)], totalCount: 3);
+    await tester.pump();
+    expect(state().items.map((g) => g.id), ['game-1']);
+
+    repo.complete(2, items: [game(9, title: 'Neu')], totalCount: 1);
+    await tester.pump();
+    expect(state().items.map((g) => g.title), ['Neu']);
+  });
+
   run('KAT-01 Kriterium 5: an error while loading more keeps the hits', (
     tester,
   ) async {

app/test/features/catalog/presentation/search/catalog_search_screen_test.dart

@@ -82,6 +82,26 @@ void main() {
       expect(repository.calls.first.query.isEmpty, isTrue);
     });
 
+    testWidgets('Android: system back from a deep link returns to the start '
+        'page instead of closing the app', (tester) async {
+      useWindow(tester, 420);
+      final repository = FakeCatalogRepository(all: [game(1)]);
+      final container = await pumpShuffleApp(
+        tester,
+        overrides: catalogOverrides(repository),
+      );
+      container.read(appRouterProvider).go('/catalog?q=catan');
+      await tester.pumpAndSettle();
+      expect(find.byKey(const Key('catalog_search_screen')), findsOneWidget);
+
+      // The framework's system back; `false` would mean the app closes.
+      final handled = await tester.binding.handlePopRoute();
+      await tester.pumpAndSettle();
+
+      expect(handled, isTrue);
+      expect(find.byKey(const Key('home_screen')), findsOneWidget);
+    });
+
     testWidgets('start page entry opens the search and back returns', (
       tester,
     ) async {
@@ -133,7 +153,13 @@ void main() {
         ),
       );
       final router = buildTestRouter(
-        routes: catalogRoutes,
+        routes: [
+          GoRoute(
+            path: '/',
+            builder: (context, state) => const SizedBox(),
+            routes: catalogRoutes,
+          ),
+        ],
         initialLocation: initialLocation,
       );
       addTearDown(router.dispose);

app/test/features/catalog/presentation/search/catalog_search_view_test.dart

@@ -362,6 +362,23 @@ void main() {
       expect(find.byKey(const Key('catalog_error')), findsNothing);
     });
 
+    testWidgets('rejected input shows an own text and offers no retry', (
+      tester,
+    ) async {
+      final repository = FakeCatalogRepository()
+        ..failWith = const CatalogFailure.invalidInput();
+
+      await pumpView(tester, repository);
+
+      expect(
+        find.text(
+          'Diese Suche wird nicht unterstützt. Ändere den Suchbegriff oder die Filter.',
+        ),
+        findsOneWidget,
+      );
+      expect(find.byKey(const Key('catalog_error_retry')), findsNothing);
+    });
+
     testWidgets('Zustände Kriterium 2: other errors show the generic text', (
       tester,
     ) async {

docs/design-system.md

@@ -87,13 +87,13 @@ Formular-Komponenten (Texte von außen, Tests gegen die Guidelines in Hell und D
 | Komponente | Zweck und API (Kurzform) |
 |---|---|
 | `AppStateMessage` | Leer-/Fehlerzustand: `icon` (dekorativ, für Screenreader ausgeblendet), `title`, optional `message`, `actions` (`AppStateAction(label, onPressed, key)`; die erste Aktion ist tonal hervorgehoben, weitere umrandet; alle 48 dp). Titel und Hinweis sind eine Live-Region. |
-| `AppListFooter` | Fuß einer seitenweise geladenen Liste: `isLoading` (beschrifteter Fortschrittskreis), `hasMore` (Schaltfläche „Weitere laden“, per Tastatur und Screenreader erreichbar, optional `loadMoreFocusNode`), `errorMessage` + Wiederholen (bereits geladene Einträge bleiben). Vorrang: Fehler vor Laden vor „Weitere laden“. Automatisches Nachladen ist Sache des Aufrufers; die Schaltfläche bleibt der Weg für Tastatur und Screenreader. |
+| `AppListFooter` | Fuß einer seitenweise geladenen Liste: `isLoading` (beschrifteter Fortschrittskreis), `hasMore` (Schaltfläche „Weitere laden“, per Tastatur und Screenreader erreichbar), `errorMessage` + Wiederholen (bereits geladene Einträge bleiben). Vorrang: Fehler vor Laden vor „Weitere laden“. Automatisches Nachladen ist Sache des Aufrufers; die Schaltfläche bleibt der Weg für Tastatur und Screenreader. |
 
 **Katalogsuche (`features/catalog/presentation/search/`)** – Aufbau und Verhalten, Entscheidungen der Umsetzung (Spec #3 § 5.6):
 
 - Kompakt (< 600 dp) und mittel (600–1023 dp): Suchfeld, darunter die Schaltfläche „Filter (n)“ mit Bottom Sheet (Änderungen wirken sofort, „Fertig“ schließt); ab 1024 dp feste Seitenleiste (320 dp) links, Trefferliste rechts mit höchstens 720 dp Breite.
 - Einfachauswahl (Spielerzahl, Dauer, Alter) als beschriftete Auswahlfelder mit „Beliebig“; Genre und Mechanik als Filter-Chips, nach lokalisiertem Namen sortiert. Fehler beim Laden der Begriffe betrifft nur diese beiden Bereiche („Erneut versuchen“).
-- Trefferkachel: `GameCover` klein (Platzhalter), Titel (2 Zeilen), „auch: …“, Jahr · Verlage (zwei, sonst „+n“), Kurzangaben; ein zusammengefasstes Semantics-Label. Ohne `onTap` ist die Kachel kein Button, aber per Code fokussierbar (Fokusring 3 dp, kein Tab-Stopp).
+- Trefferkachel: `GameCover` klein (Platzhalter), Titel (2 Zeilen), „auch: …“, Jahr · Verlage (zwei, sonst „+n“), Kurzangaben; ein zusammengefasstes Semantics-Label. Ohne `onTap` ist die Kachel kein Button, aber ein Tab-Stopp mit Fokusring (3 dp): Tastaturnutzer durchlaufen so die Liste, was sie scrollt und das Nachladen auslöst (die Liste wird lazy gebaut). Im Screenreader-Durchgang bewerten, ob die vielen Tab-Stopps stören.
 - Trefferzahl über der Liste; Ansage der Trefferzahl 600 ms nach Abschluss der letzten Suche (`SemanticsService.sendAnnouncement`), nie während des Tippens.
 - Nach „Weitere laden“ (bzw. „Erneut versuchen“ im Listenfuß) springt der Fokus auf die erste neu geladene Kachel. Automatisches Nachladen, wenn weniger als etwa fünf Kacheln unterhalb des sichtbaren Bereichs liegen; nach einem Fehler nur noch über die Schaltfläche (keine Wiederholungsschleife).