Add viewed history, diagnostics, tag chips and SWF viewer

README.md

@@ -62,6 +62,10 @@ The MVP ships with seed configs for:
 - Gelbooru: `https://gelbooru.com`
 - Rule34: `https://api.rule34.xxx`
 - Safebooru: `https://safebooru.org`
+- Konachan: `https://konachan.com`
+- Yande.re: `https://yande.re`
+- e621: `https://e621.net`
+- e926: `https://e926.net`
 
 Providers implement:
 
@@ -109,6 +113,8 @@ For custom providers, MVP supports these `apiType` values:
 - `gelbooru`
 - `rule34`
 - `danbooru`
+- `moebooru`
+- `e621`
 
 Unsupported types return `ProviderUnavailableException` instead of crashing the app.
 

lib/app/router.dart

@@ -12,6 +12,7 @@ import '../features/providers/presentation/provider_form_screen.dart';
 import '../features/providers/presentation/providers_screen.dart';
 import '../features/search/presentation/search_screen.dart';
 import '../features/settings/presentation/settings_screen.dart';
+import '../features/viewed/presentation/viewed_screen.dart';
 import '../shared/widgets/app_shell.dart';
 
 final appRouterProvider = Provider<GoRouter>((ref) {
@@ -43,6 +44,10 @@ final appRouterProvider = Provider<GoRouter>((ref) {
             path: '/favorites',
             builder: (context, state) => const FavoritesScreen(),
           ),
+          GoRoute(
+            path: '/viewed',
+            builder: (context, state) => const ViewedScreen(),
+          ),
           GoRoute(
             path: '/collections',
             builder: (context, state) => const CollectionsScreen(),

lib/backend/backend.dart

@@ -4,10 +4,12 @@ export 'models/content_provider_config.dart';
 export 'models/favorite.dart';
 export 'models/post.dart';
 export 'models/post_comment.dart';
+export 'models/provider_diagnostics.dart';
 export 'models/provider_health.dart';
 export 'models/search_history.dart';
 export 'models/tag_suggestion.dart';
 export 'models/top_period_filter.dart';
+export 'models/viewed_post.dart';
 export 'providers/content_provider.dart';
 export 'providers/provider_manager.dart';
 export 'services/collection_service.dart';
@@ -17,3 +19,5 @@ export 'services/feed_service.dart';
 export 'services/provider_check_service.dart';
 export 'services/search_service.dart';
 export 'services/settings_service.dart';
+export 'services/viewed_history_service.dart';
+export 'utils/smart_blacklist.dart';

lib/backend/di/backend_providers.dart

@@ -6,6 +6,7 @@ import '../../core/cache/image_cache_service.dart';
 import '../../core/database/app_database.dart';
 import '../../core/database/database_service.dart';
 import '../../core/http/network_info.dart';
+import '../../core/utils/result.dart';
 import '../providers/provider_factory.dart';
 import '../providers/provider_manager.dart';
 import '../repositories/collection_repository.dart';
@@ -13,6 +14,7 @@ import '../repositories/favorite_repository.dart';
 import '../repositories/post_repository.dart';
 import '../repositories/provider_repository.dart';
 import '../repositories/search_repository.dart';
+import '../repositories/viewed_post_repository.dart';
 import '../services/collection_service.dart';
 import '../services/download_service.dart';
 import '../services/favorite_service.dart';
@@ -20,6 +22,7 @@ import '../services/feed_service.dart';
 import '../services/provider_check_service.dart';
 import '../services/search_service.dart';
 import '../services/settings_service.dart';
+import '../services/viewed_history_service.dart';
 
 final appDatabaseProvider = FutureProvider<AppDatabase>((ref) async {
   final database = await AppDatabase.open();
@@ -54,6 +57,10 @@ final searchRepositoryProvider = Provider<SearchRepository>((ref) {
   return SearchRepository(ref.watch(databaseServiceProvider));
 });
 
+final viewedPostRepositoryProvider = Provider<ViewedPostRepository>((ref) {
+  return ViewedPostRepository(ref.watch(databaseServiceProvider));
+});
+
 final favoriteRepositoryProvider = Provider<FavoriteRepository>((ref) {
   return FavoriteRepository(
     ref.watch(databaseServiceProvider),
@@ -88,9 +95,22 @@ final feedServiceProvider = Provider<FeedService>((ref) {
     ref.watch(providerManagerProvider),
     ref.watch(cacheServiceProvider),
     ref.watch(settingsServiceProvider),
+    ref.watch(viewedHistoryServiceProvider),
   );
 });
 
+final viewedHistoryServiceProvider = Provider<ViewedHistoryService>((ref) {
+  return ViewedHistoryService(
+    ref.watch(viewedPostRepositoryProvider),
+    ref.watch(postRepositoryProvider),
+  );
+});
+
+final viewedKeysProvider = FutureProvider<Set<String>>((ref) async {
+  final result = await ref.watch(viewedHistoryServiceProvider).getViewedKeys();
+  return result is Success<Set<String>> ? result.data : <String>{};
+});
+
 final searchServiceProvider = Provider<SearchService>((ref) {
   return SearchService(
     ref.watch(searchRepositoryProvider),

lib/backend/mappers/gelbooru_mapper.dart

@@ -30,7 +30,10 @@ class GelbooruMapper {
         fileUrl);
     final previewUrl =
         _string(json['preview_url'] ?? json['previewUrl'] ?? sampleUrl);
-    final tags = _tags(json['tags'] ?? json['tag_string']);
+    final explicitGroups = _tagGroupsFromJson(json);
+    final tags = explicitGroups.isEmpty
+        ? _tags(json['tags'] ?? json['tag_string'])
+        : explicitGroups.values.expand((items) => items).toSet().toList();
     return Post(
       id: id,
       providerId: providerId,
@@ -46,7 +49,7 @@ class GelbooruMapper {
       createdAt: _date(json['created_at'] ?? json['createdAt']),
       fileType: _fileType(fileUrl, json['file_ext']),
       score: _int(json['score']),
-      tagGroups: _tagGroups(tags),
+      tagGroups: explicitGroups.isEmpty ? _tagGroups(tags) : explicitGroups,
     );
   }
 
@@ -108,4 +111,21 @@ class GelbooruMapper {
   static Map<String, List<String>> _tagGroups(List<String> tags) {
     return tags.isEmpty ? const {} : {'general': tags};
   }
+
+  static Map<String, List<String>> _tagGroupsFromJson(
+    Map<String, dynamic> json,
+  ) {
+    final groups = <String, List<String>>{};
+    void add(String key, dynamic value) {
+      final tags = _tags(value);
+      if (tags.isNotEmpty) groups[key] = tags;
+    }
+
+    add('general', json['tag_string_general'] ?? json['tags_general']);
+    add('artist', json['tag_string_artist'] ?? json['tags_artist']);
+    add('copyright', json['tag_string_copyright'] ?? json['tags_copyright']);
+    add('character', json['tag_string_character'] ?? json['tags_character']);
+    add('meta', json['tag_string_meta'] ?? json['tags_meta']);
+    return groups;
+  }
 }

lib/backend/models/provider_diagnostics.dart

@@ -0,0 +1,13 @@
+class ProviderDiagnostics {
+  const ProviderDiagnostics({
+    required this.providerId,
+    required this.lastSearchAt,
+    required this.lastResultCount,
+    this.lastErrorMessage,
+  });
+
+  final String providerId;
+  final DateTime lastSearchAt;
+  final int lastResultCount;
+  final String? lastErrorMessage;
+}

lib/backend/models/viewed_post.dart

@@ -0,0 +1,16 @@
+class ViewedPost {
+  const ViewedPost({
+    required this.viewedKey,
+    required this.providerId,
+    required this.postId,
+    required this.viewedAt,
+  });
+
+  final String viewedKey;
+  final String providerId;
+  final String postId;
+  final DateTime viewedAt;
+
+  static String keyFor(String providerId, String postId) =>
+      '$providerId:$postId';
+}

lib/backend/providers/danbooru_provider.dart

@@ -43,7 +43,7 @@ class DanbooruProvider implements ContentProvider, CommentProvider {
     final response = await _dio.get<dynamic>(
       '/posts.json',
       queryParameters: {
-        'page': page <= 0 ? 1 : page,
+        'page': page + 1,
         'limit': limit,
         'tags': queryTags.join(' '),
         ..._queryParameters,
@@ -107,8 +107,7 @@ class DanbooruProvider implements ContentProvider, CommentProvider {
         ..._queryParameters,
       },
     );
-    final data = response.data;
-    final items = data is List ? data : const [];
+    final items = _commentItems(response.data);
     return items
         .whereType<Map>()
         .map((item) {
@@ -117,9 +116,13 @@ class DanbooruProvider implements ContentProvider, CommentProvider {
             id: (json['id'] ?? '').toString(),
             postId: (json['post_id'] ?? postId).toString(),
             providerId: id,
-            authorName: (json['creator_name'] ?? json['creator_id'] ?? 'user')
+            authorName: (json['creator_name'] ??
+                    json['creator_id'] ??
+                    json['updater_name'] ??
+                    'user')
+                .toString(),
+            body: (json['body'] ?? json['text'] ?? json['comment'] ?? '')
                 .toString(),
-            body: (json['body'] ?? '').toString(),
             createdAt:
                 DateTime.tryParse((json['created_at'] ?? '').toString()) ??
                     DateTime.fromMillisecondsSinceEpoch(0),
@@ -129,6 +132,20 @@ class DanbooruProvider implements ContentProvider, CommentProvider {
         .toList();
   }
 
+  List<dynamic> _commentItems(dynamic data) {
+    if (data is List) return data;
+    if (data is! Map) return const [];
+    final json = Map<String, dynamic>.from(data);
+    final comments = json['comments'];
+    if (comments is List) return comments;
+    final records = json['records'];
+    if (records is List) return records;
+    final comment = json['comment'];
+    if (comment is List) return comment;
+    if (comment is Map) return [comment];
+    return const [];
+  }
+
   List<String> _topTags(TopPeriodFilter period) {
     return switch (period) {
       TopPeriodFilter.none => const [],

lib/backend/providers/e621_provider.dart

@@ -3,12 +3,14 @@ import 'package:dio/dio.dart';
 import '../../core/http/dio_client.dart';
 import '../mappers/e621_mapper.dart';
 import '../models/post.dart';
+import '../models/post_comment.dart';
 import '../models/provider_health.dart';
 import '../models/tag_suggestion.dart';
 import '../models/top_period_filter.dart';
 import 'content_provider.dart';
 
-class E621Provider implements ContentProvider, TagSuggestionProvider {
+class E621Provider
+    implements ContentProvider, TagSuggestionProvider, CommentProvider {
   E621Provider({
     required this.id,
     required this.name,
@@ -38,7 +40,7 @@ class E621Provider implements ContentProvider, TagSuggestionProvider {
     final response = await _dio.get<dynamic>(
       '/posts.json',
       queryParameters: {
-        'page': page <= 0 ? 1 : page,
+        'page': page + 1,
         'limit': limit.clamp(1, 75),
         'tags': [
           ...tags,
@@ -125,6 +127,37 @@ class E621Provider implements ContentProvider, TagSuggestionProvider {
         .toList();
   }
 
+  @override
+  Future<List<PostComment>> getComments(String postId) async {
+    final response = await _dio.get<dynamic>(
+      '/comments.json',
+      queryParameters: {
+        'search[post_id]': postId,
+        'limit': 50,
+        ..._queryParameters,
+      },
+    );
+    final items = response.data is List ? response.data as List : const [];
+    return items
+        .whereType<Map>()
+        .map((item) {
+          final json = Map<String, dynamic>.from(item);
+          return PostComment(
+            id: (json['id'] ?? '').toString(),
+            postId: (json['post_id'] ?? postId).toString(),
+            providerId: id,
+            authorName: (json['creator_name'] ?? json['creator_id'] ?? 'user')
+                .toString(),
+            body: (json['body'] ?? '').toString(),
+            createdAt:
+                DateTime.tryParse((json['created_at'] ?? '').toString()) ??
+                    DateTime.fromMillisecondsSinceEpoch(0),
+          );
+        })
+        .where((comment) => comment.body.trim().isNotEmpty)
+        .toList();
+  }
+
   String _rating(String value) {
     return switch (value.toLowerCase()) {
       'safe' => 's',

lib/backend/providers/gelbooru_provider.dart

@@ -148,13 +148,7 @@ class GelbooruProvider implements ContentProvider, CommentProvider {
   }
 
   List<PostComment> _commentsFromResponse(dynamic data, String postId) {
-    final raw = switch (data) {
-      List() => data,
-      {'comments': final List comments} => comments,
-      {'@attributes': _, 'comment': final List comments} => comments,
-      {'comment': final List comments} => comments,
-      _ => const [],
-    };
+    final raw = _commentItems(data);
     return raw
         .whereType<Map>()
         .map((item) {
@@ -165,10 +159,18 @@ class GelbooruProvider implements ContentProvider, CommentProvider {
             providerId: id,
             authorName: (json['creator'] ??
                     json['creator_name'] ??
+                    json['creator_id'] ??
+                    json['user'] ??
+                    json['username'] ??
                     json['author'] ??
                     '')
                 .toString(),
-            body: (json['body'] ?? json['comment'] ?? '').toString(),
+            body: (json['body'] ??
+                    json['comment'] ??
+                    json['content'] ??
+                    json['text'] ??
+                    '')
+                .toString(),
             createdAt: DateTime.tryParse(
                   (json['created_at'] ?? json['created'] ?? '').toString(),
                 ) ??
@@ -178,4 +180,66 @@ class GelbooruProvider implements ContentProvider, CommentProvider {
         .where((comment) => comment.body.trim().isNotEmpty)
         .toList();
   }
+
+  List<dynamic> _commentItems(dynamic data) {
+    if (data is List) return data;
+    if (data is String) return _commentItemsFromText(data);
+    if (data is! Map) return const [];
+    final json = Map<String, dynamic>.from(data);
+    final comments = json['comments'];
+    if (comments is List) return comments;
+    if (comments is Map) return _commentItems(comments);
+    final comment = json['comment'];
+    if (comment is List) return comment;
+    if (comment is Map) return [comment];
+    return const [];
+  }
+
+  List<Map<String, dynamic>> _commentItemsFromText(String text) {
+    final items = <Map<String, dynamic>>[];
+    for (final match in RegExp(r'<comment\b([^>]*)>(.*?)</comment>',
+            caseSensitive: false, dotAll: true)
+        .allMatches(text)) {
+      final attrs = _attributes(match.group(1) ?? '');
+      final body = _tagValue(match.group(2) ?? '', 'body') ??
+          _tagValue(match.group(2) ?? '', 'comment') ??
+          match.group(2) ??
+          '';
+      items.add({...attrs, 'body': body});
+    }
+    for (final match
+        in RegExp(r'<comment\b([^>]*)/?>', caseSensitive: false, dotAll: true)
+            .allMatches(text)) {
+      final attrs = _attributes(match.group(1) ?? '');
+      if (attrs.isNotEmpty) items.add(attrs);
+    }
+    return items;
+  }
+
+  Map<String, dynamic> _attributes(String source) {
+    final result = <String, dynamic>{};
+    for (final match in RegExp(r'''([A-Za-z0-9_:-]+)\s*=\s*["']([^"']*)["']''')
+        .allMatches(source)) {
+      result[match.group(1)!] = _decodeEntities(match.group(2) ?? '');
+    }
+    return result;
+  }
+
+  String? _tagValue(String source, String tag) {
+    final match =
+        RegExp('<$tag[^>]*>(.*?)</$tag>', caseSensitive: false, dotAll: true)
+            .firstMatch(source);
+    final value = match?.group(1);
+    return value == null ? null : _decodeEntities(value.trim());
+  }
+
+  String _decodeEntities(String value) {
+    return value
+        .replaceAll('&amp;', '&')
+        .replaceAll('&lt;', '<')
+        .replaceAll('&gt;', '>')
+        .replaceAll('&quot;', '"')
+        .replaceAll('&#039;', "'")
+        .replaceAll('&apos;', "'");
+  }
 }

lib/backend/providers/moebooru_provider.dart

@@ -3,12 +3,14 @@ import 'package:dio/dio.dart';
 import '../../core/http/dio_client.dart';
 import '../mappers/moebooru_mapper.dart';
 import '../models/post.dart';
+import '../models/post_comment.dart';
 import '../models/provider_health.dart';
 import '../models/tag_suggestion.dart';
 import '../models/top_period_filter.dart';
 import 'content_provider.dart';
 
-class MoebooruProvider implements ContentProvider, TagSuggestionProvider {
+class MoebooruProvider
+    implements ContentProvider, TagSuggestionProvider, CommentProvider {
   MoebooruProvider({
     required this.id,
     required this.name,
@@ -38,7 +40,7 @@ class MoebooruProvider implements ContentProvider, TagSuggestionProvider {
     final response = await _dio.get<dynamic>(
       '/post.json',
       queryParameters: {
-        'page': page <= 0 ? 1 : page,
+        'page': page + 1,
         'limit': limit.clamp(1, 100),
         'tags': [
           ...tags,
@@ -127,6 +129,40 @@ class MoebooruProvider implements ContentProvider, TagSuggestionProvider {
         .toList();
   }
 
+  @override
+  Future<List<PostComment>> getComments(String postId) async {
+    final response = await _dio.get<dynamic>(
+      '/comment.json',
+      queryParameters: {
+        'post_id': postId,
+        'limit': 50,
+        ..._queryParameters,
+      },
+    );
+    final items = response.data is List ? response.data as List : const [];
+    return items
+        .whereType<Map>()
+        .map((item) {
+          final json = Map<String, dynamic>.from(item);
+          return PostComment(
+            id: (json['id'] ?? '').toString(),
+            postId: (json['post_id'] ?? postId).toString(),
+            providerId: id,
+            authorName:
+                (json['creator'] ?? json['author'] ?? json['user'] ?? 'user')
+                    .toString(),
+            body: (json['body'] ?? json['comment'] ?? json['text'] ?? '')
+                .toString(),
+            createdAt: DateTime.tryParse(
+                  (json['created_at'] ?? json['created_on'] ?? '').toString(),
+                ) ??
+                DateTime.fromMillisecondsSinceEpoch(0),
+          );
+        })
+        .where((comment) => comment.body.trim().isNotEmpty)
+        .toList();
+  }
+
   List<String> _topTags(TopPeriodFilter period) {
     return switch (period) {
       TopPeriodFilter.none => const [],

lib/backend/providers/provider_manager.dart

@@ -5,6 +5,7 @@ import '../../core/utils/result.dart';
 import '../models/content_provider_config.dart';
 import '../models/post.dart';
 import '../models/post_comment.dart';
+import '../models/provider_diagnostics.dart';
 import '../models/provider_health.dart';
 import '../models/tag_suggestion.dart';
 import '../models/top_period_filter.dart';
@@ -97,6 +98,7 @@ class ProviderManager {
     }
 
     final posts = <Post>[];
+    final seen = <String>{};
     for (final provider in providers) {
       try {
         final providerPosts = await provider.searchPosts(
@@ -106,8 +108,25 @@ class ProviderManager {
           rating: rating,
           topPeriod: topPeriod,
         );
-        posts.addAll(providerPosts);
+        for (final post in providerPosts) {
+          if (seen.add(post.cacheKey)) posts.add(post);
+        }
+        await _repository.saveDiagnostics(
+          ProviderDiagnostics(
+            providerId: provider.id,
+            lastSearchAt: DateTime.now(),
+            lastResultCount: providerPosts.length,
+          ),
+        );
       } catch (_) {
+        await _repository.saveDiagnostics(
+          ProviderDiagnostics(
+            providerId: provider.id,
+            lastSearchAt: DateTime.now(),
+            lastResultCount: 0,
+            lastErrorMessage: 'Search failed',
+          ),
+        );
         await _repository.saveHealth(
           ProviderHealth(
             providerId: provider.id,

lib/backend/repositories/provider_repository.dart

@@ -4,6 +4,7 @@ import '../../core/database/app_database.dart';
 import '../../core/database/database_service.dart';
 import '../../core/utils/result.dart';
 import '../models/content_provider_config.dart';
+import '../models/provider_diagnostics.dart';
 import '../models/provider_health.dart';
 
 class ProviderRepository {
@@ -111,6 +112,14 @@ class ProviderRepository {
 
   Future<Result<void>> ensureSeedProviders() {
     return _databaseService.safeWrite((isar) async {
+      final existingProviders =
+          await isar.providerConfigEntitys.where().findAll();
+      for (final provider in existingProviders) {
+        if (provider.providerId == 'kemono' ||
+            provider.providerId == 'coomer') {
+          await isar.providerConfigEntitys.delete(provider.isarId);
+        }
+      }
       final seeds = seedProviders();
       for (final seed in seeds) {
         final exists = await isar.providerConfigEntitys
@@ -186,4 +195,19 @@ class ProviderRepository {
       return entity?.toModel();
     });
   }
+
+  Future<Result<void>> saveDiagnostics(ProviderDiagnostics diagnostics) {
+    return _databaseService.safeWrite((isar) async {
+      await isar.providerDiagnosticsEntitys.put(
+        ProviderDiagnosticsEntity.fromModel(diagnostics),
+      );
+    });
+  }
+
+  Future<Result<List<ProviderDiagnostics>>> getDiagnostics() {
+    return _databaseService.safeRead((isar) async {
+      final items = await isar.providerDiagnosticsEntitys.where().findAll();
+      return items.map((item) => item.toModel()).toList();
+    });
+  }
 }

lib/backend/repositories/viewed_post_repository.dart

@@ -0,0 +1,59 @@
+import 'package:isar/isar.dart';
+
+import '../../core/database/app_database.dart';
+import '../../core/database/database_service.dart';
+import '../../core/utils/result.dart';
+import '../models/viewed_post.dart';
+
+class ViewedPostRepository {
+  ViewedPostRepository(this._databaseService);
+
+  final DatabaseService _databaseService;
+
+  Future<Result<void>> markViewed(String providerId, String postId) {
+    return _databaseService.safeWrite((isar) async {
+      final key = ViewedPost.keyFor(providerId, postId);
+      await isar.viewedPostEntitys.put(
+        ViewedPostEntity.fromModel(
+          ViewedPost(
+            viewedKey: key,
+            providerId: providerId,
+            postId: postId,
+            viewedAt: DateTime.now(),
+          ),
+        ),
+      );
+    });
+  }
+
+  Future<Result<bool>> exists(String providerId, String postId) {
+    return _databaseService.safeRead((isar) async {
+      final entity = await isar.viewedPostEntitys
+          .filter()
+          .viewedKeyEqualTo(ViewedPost.keyFor(providerId, postId))
+          .findFirst();
+      return entity != null;
+    });
+  }
+
+  Future<Result<Set<String>>> keys() {
+    return _databaseService.safeRead((isar) async {
+      final items = await isar.viewedPostEntitys.where().findAll();
+      return items.map((item) => item.viewedKey).toSet();
+    });
+  }
+
+  Future<Result<List<ViewedPost>>> recent() {
+    return _databaseService.safeRead((isar) async {
+      final items = await isar.viewedPostEntitys.where().findAll();
+      items.sort((a, b) => b.viewedAt.compareTo(a.viewedAt));
+      return items.map((item) => item.toModel()).toList();
+    });
+  }
+
+  Future<Result<void>> clear() {
+    return _databaseService.safeWrite((isar) async {
+      await isar.viewedPostEntitys.clear();
+    });
+  }
+}

lib/backend/services/feed_service.dart

@@ -3,14 +3,22 @@ import '../../core/utils/result.dart';
 import '../models/post.dart';
 import '../models/top_period_filter.dart';
 import '../providers/provider_manager.dart';
+import '../services/viewed_history_service.dart';
+import '../utils/smart_blacklist.dart';
 import 'settings_service.dart';
 
 class FeedService {
-  FeedService(this._providerManager, this._cacheService, this._settingsService);
+  FeedService(
+    this._providerManager,
+    this._cacheService,
+    this._settingsService,
+    this._viewedHistoryService,
+  );
 
   final ProviderManager _providerManager;
   final CacheService _cacheService;
   final SettingsService _settingsService;
+  final ViewedHistoryService _viewedHistoryService;
   final Map<String, int> _pages = {};
 
   String _key(
@@ -61,10 +69,65 @@ class FeedService {
     final posts = (result as Success<List<Post>>).data;
     _pages[key] = page + 1;
     final settingsResult = await _settingsService.getSettings();
-    final maxItems = settingsResult is Success<AppSettings>
-        ? settingsResult.data.cacheMaxItems
-        : null;
-    await _cacheService.cachePosts(posts, maxItems: maxItems);
-    return Success(posts);
+    final settings = settingsResult is Success<AppSettings>
+        ? settingsResult.data
+        : AppSettings.defaults;
+    final viewedKeysResult = settings.hideViewedPosts
+        ? await _viewedHistoryService.getViewedKeys()
+        : const Success(<String>{});
+    final viewedKeys = viewedKeysResult is Success<Set<String>>
+        ? viewedKeysResult.data
+        : <String>{};
+    final filteredPosts = posts
+        .where((post) => postMatchesRequestedTags(post, tags))
+        .where((post) => postPassesTagFilters(post, settings))
+        .where((post) =>
+            !settings.hideViewedPosts || !viewedKeys.contains(post.cacheKey))
+        .toList(growable: false);
+    await _cacheService.cachePosts(
+      filteredPosts,
+      maxItems: settings.cacheMaxItems,
+    );
+    return Success(filteredPosts);
   }
 }
+
+bool postMatchesRequestedTags(Post post, List<String> requestedTags) {
+  final requested = requestedTags
+      .map((tag) => tag.trim().toLowerCase())
+      .where((tag) => tag.isNotEmpty && !tag.startsWith('-'))
+      .toList(growable: false);
+  if (requested.isEmpty) return true;
+  final postTags = _postTagSet(post);
+  return requested.every(postTags.contains);
+}
+
+bool postPassesTagFilters(Post post, AppSettings settings) {
+  final tags = _postTagSet(post);
+  if (tags.isEmpty) return settings.whitelistedTags.isEmpty;
+
+  final blacklist = [
+    ...settings.smartBlacklistRules,
+    ...settings.blacklistedTags,
+  ].map((tag) => tag.trim().toLowerCase()).where((tag) => tag.isNotEmpty);
+  if (blacklist.any((rule) => SmartBlacklistMatcher.matches(post, rule))) {
+    return false;
+  }
+
+  final whitelist = settings.whitelistedTags
+      .map((tag) => tag.trim().toLowerCase())
+      .where((tag) => tag.isNotEmpty)
+      .toList(growable: false);
+  if (whitelist.isEmpty) return true;
+  return whitelist.any(tags.contains);
+}
+
+Set<String> _postTagSet(Post post) {
+  return <String>{
+    ...post.tags,
+    for (final group in post.tagGroups.values) ...group,
+  }
+      .map((tag) => tag.trim().toLowerCase())
+      .where((tag) => tag.isNotEmpty)
+      .toSet();
+}

lib/backend/services/settings_service.dart

@@ -24,6 +24,10 @@ class AppSettings {
     required this.selectedFeedProviderIds,
     required this.showPostBadges,
     required this.defaultTopPeriodFilter,
+    required this.blacklistedTags,
+    required this.whitelistedTags,
+    required this.smartBlacklistRules,
+    required this.hideViewedPosts,
     this.defaultRatingFilter,
   });
 
@@ -40,6 +44,10 @@ class AppSettings {
   final List<String> selectedFeedProviderIds;
   final bool showPostBadges;
   final String defaultTopPeriodFilter;
+  final List<String> blacklistedTags;
+  final List<String> whitelistedTags;
+  final List<String> smartBlacklistRules;
+  final bool hideViewedPosts;
   final String? defaultRatingFilter;
 
   static const defaults = AppSettings(
@@ -56,6 +64,10 @@ class AppSettings {
     selectedFeedProviderIds: [],
     showPostBadges: true,
     defaultTopPeriodFilter: 'none',
+    blacklistedTags: [],
+    whitelistedTags: [],
+    smartBlacklistRules: [],
+    hideViewedPosts: false,
     defaultRatingFilter: null,
   );
 
@@ -73,6 +85,10 @@ class AppSettings {
     List<String>? selectedFeedProviderIds,
     bool? showPostBadges,
     String? defaultTopPeriodFilter,
+    List<String>? blacklistedTags,
+    List<String>? whitelistedTags,
+    List<String>? smartBlacklistRules,
+    bool? hideViewedPosts,
     String? defaultRatingFilter,
   }) {
     return AppSettings(
@@ -91,6 +107,10 @@ class AppSettings {
       showPostBadges: showPostBadges ?? this.showPostBadges,
       defaultTopPeriodFilter:
           defaultTopPeriodFilter ?? this.defaultTopPeriodFilter,
+      blacklistedTags: blacklistedTags ?? this.blacklistedTags,
+      whitelistedTags: whitelistedTags ?? this.whitelistedTags,
+      smartBlacklistRules: smartBlacklistRules ?? this.smartBlacklistRules,
+      hideViewedPosts: hideViewedPosts ?? this.hideViewedPosts,
       defaultRatingFilter: defaultRatingFilter ?? this.defaultRatingFilter,
     );
   }
@@ -109,6 +129,10 @@ class AppSettings {
         'selectedFeedProviderIds': selectedFeedProviderIds,
         'showPostBadges': showPostBadges,
         'defaultTopPeriodFilter': defaultTopPeriodFilter,
+        'blacklistedTags': blacklistedTags,
+        'whitelistedTags': whitelistedTags,
+        'smartBlacklistRules': smartBlacklistRules,
+        'hideViewedPosts': hideViewedPosts,
         'defaultRatingFilter': defaultRatingFilter,
       };
 
@@ -141,6 +165,19 @@ class AppSettings {
             (json['showPostBadges'] as bool?) ?? defaults.showPostBadges,
         defaultTopPeriodFilter: (json['defaultTopPeriodFilter'] as String?) ??
             defaults.defaultTopPeriodFilter,
+        blacklistedTags: List<String>.from(
+          (json['blacklistedTags'] as List?) ?? defaults.blacklistedTags,
+        ),
+        whitelistedTags: List<String>.from(
+          (json['whitelistedTags'] as List?) ?? defaults.whitelistedTags,
+        ),
+        smartBlacklistRules: List<String>.from(
+          (json['smartBlacklistRules'] as List?) ??
+              (json['blacklistedTags'] as List?) ??
+              defaults.smartBlacklistRules,
+        ),
+        hideViewedPosts:
+            (json['hideViewedPosts'] as bool?) ?? defaults.hideViewedPosts,
         defaultRatingFilter: json['defaultRatingFilter'] as String?,
       );
 }

lib/backend/services/viewed_history_service.dart

@@ -0,0 +1,41 @@
+import '../../core/utils/result.dart';
+import '../models/post.dart';
+import '../models/viewed_post.dart';
+import '../repositories/post_repository.dart';
+import '../repositories/viewed_post_repository.dart';
+
+class ViewedHistoryService {
+  ViewedHistoryService(this._repository, this._postRepository);
+
+  final ViewedPostRepository _repository;
+  final PostRepository _postRepository;
+
+  Future<Result<void>> markViewed(Post post) async {
+    final cacheResult = await _postRepository.cachePosts([post]);
+    if (cacheResult is Error<void>) return cacheResult;
+    return _repository.markViewed(post.providerId, post.id);
+  }
+
+  Future<Result<bool>> isViewed(String postId, String providerId) {
+    return _repository.exists(providerId, postId);
+  }
+
+  Future<Result<Set<String>>> getViewedKeys() {
+    return _repository.keys();
+  }
+
+  Future<Result<List<Post>>> getViewedPosts() async {
+    final viewedResult = await _repository.recent();
+    if (viewedResult is Error<List<ViewedPost>>) {
+      return Error(viewedResult.failure);
+    }
+    final viewed = (viewedResult as Success<List<ViewedPost>>).data;
+    return _postRepository.getCachedPostsByKeys(
+      viewed.map((item) => item.viewedKey),
+    );
+  }
+
+  Future<Result<void>> clearHistory() {
+    return _repository.clear();
+  }
+}

lib/backend/utils/smart_blacklist.dart

@@ -0,0 +1,78 @@
+import '../models/post.dart';
+
+class SmartBlacklistMatcher {
+  const SmartBlacklistMatcher._();
+
+  static bool matches(Post post, String rule) {
+    final tokens = rule
+        .trim()
+        .toLowerCase()
+        .split(RegExp(r'\s+'))
+        .where((token) => token.isNotEmpty)
+        .toList(growable: false);
+    if (tokens.isEmpty) return false;
+    return tokens.every((token) => _matchesToken(post, token));
+  }
+
+  static bool _matchesToken(Post post, String token) {
+    final parts = token.split(':');
+    if (parts.length >= 2) {
+      final key = parts.first;
+      final value = parts.sublist(1).join(':');
+      return switch (key) {
+        'provider' => post.providerId.toLowerCase() == value,
+        'rating' => post.rating.toLowerCase() == value ||
+            post.rating.toLowerCase().startsWith(value),
+        'type' || 'filetype' => post.fileType.toLowerCase().contains(value),
+        'score' => _scoreMatches(post.score, value),
+        'artist' ||
+        'character' ||
+        'copyright' ||
+        'meta' ||
+        'general' =>
+          _groupContains(post, key, value),
+        _ => _allTags(post).contains(token),
+      };
+    }
+    return _allTags(post).contains(token);
+  }
+
+  static bool _scoreMatches(int score, String value) {
+    if (value.startsWith('>=')) {
+      return score >= (int.tryParse(value.substring(2)) ?? score + 1);
+    }
+    if (value.startsWith('<=')) {
+      return score <= (int.tryParse(value.substring(2)) ?? score - 1);
+    }
+    if (value.startsWith('>')) {
+      return score > (int.tryParse(value.substring(1)) ?? score);
+    }
+    if (value.startsWith('<')) {
+      return score < (int.tryParse(value.substring(1)) ?? score);
+    }
+    return score == int.tryParse(value);
+  }
+
+  static bool _groupContains(Post post, String group, String tag) {
+    return (post.tagGroups[group] ?? const [])
+        .map((value) => value.toLowerCase())
+        .contains(tag);
+  }
+
+  static Set<String> _allTags(Post post) {
+    return {
+      ...post.tags,
+      for (final group in post.tagGroups.values) ...group,
+    }.map((tag) => tag.toLowerCase()).toSet();
+  }
+}
+
+List<String> similarTagsFor(Post post) {
+  final priority = [
+    ...post.tagGroups['artist'] ?? const <String>[],
+    ...post.tagGroups['character'] ?? const <String>[],
+    ...post.tagGroups['copyright'] ?? const <String>[],
+  ].where((tag) => tag.trim().isNotEmpty).toSet().take(5).toList();
+  if (priority.isNotEmpty) return priority;
+  return post.tags.where((tag) => tag.trim().isNotEmpty).take(5).toList();
+}

lib/core/database/app_database.dart

@@ -7,8 +7,10 @@ import '../../backend/models/collection.dart';
 import '../../backend/models/content_provider_config.dart';
 import '../../backend/models/favorite.dart';
 import '../../backend/models/post.dart';
+import '../../backend/models/provider_diagnostics.dart';
 import '../../backend/models/provider_health.dart';
 import '../../backend/models/search_history.dart';
+import '../../backend/models/viewed_post.dart';
 
 part 'app_database.g.dart';
 
@@ -29,6 +31,8 @@ class AppDatabase {
         CollectionPostEntitySchema,
         SearchHistoryEntitySchema,
         AppSettingEntitySchema,
+        ViewedPostEntitySchema,
+        ProviderDiagnosticsEntitySchema,
       ],
       directory: dir,
       name: 'gel_rule_app',
@@ -276,3 +280,56 @@ class AppSettingEntity {
   late String jsonValue;
   late DateTime updatedAt;
 }
+
+@collection
+class ViewedPostEntity {
+  Id isarId = Isar.autoIncrement;
+
+  @Index(unique: true, replace: true)
+  late String viewedKey;
+  @Index(composite: [CompositeIndex('postId')])
+  late String providerId;
+  late String postId;
+  late DateTime viewedAt;
+
+  ViewedPost toModel() => ViewedPost(
+        viewedKey: viewedKey,
+        providerId: providerId,
+        postId: postId,
+        viewedAt: viewedAt,
+      );
+
+  static ViewedPostEntity fromModel(ViewedPost model) {
+    return ViewedPostEntity()
+      ..viewedKey = model.viewedKey
+      ..providerId = model.providerId
+      ..postId = model.postId
+      ..viewedAt = model.viewedAt;
+  }
+}
+
+@collection
+class ProviderDiagnosticsEntity {
+  Id isarId = Isar.autoIncrement;
+
+  @Index(unique: true, replace: true)
+  late String providerId;
+  late DateTime lastSearchAt;
+  late int lastResultCount;
+  String? lastErrorMessage;
+
+  ProviderDiagnostics toModel() => ProviderDiagnostics(
+        providerId: providerId,
+        lastSearchAt: lastSearchAt,
+        lastResultCount: lastResultCount,
+        lastErrorMessage: lastErrorMessage,
+      );
+
+  static ProviderDiagnosticsEntity fromModel(ProviderDiagnostics model) {
+    return ProviderDiagnosticsEntity()
+      ..providerId = model.providerId
+      ..lastSearchAt = model.lastSearchAt
+      ..lastResultCount = model.lastResultCount
+      ..lastErrorMessage = model.lastErrorMessage;
+  }
+}

lib/features/feed/presentation/feed_controller.dart

@@ -47,9 +47,13 @@ class FeedController extends AsyncNotifier<FeedState> {
     if (current == null || current.isLoadingMore || !current.hasMore) return;
     state = AsyncData(current.copyWith(isLoadingMore: true, clearError: true));
     final posts = await _load(refresh: false, current: current);
+    final existingKeys = current.posts.map((post) => post.cacheKey).toSet();
+    final newPosts = posts
+        .where((post) => existingKeys.add(post.cacheKey))
+        .toList(growable: false);
     state = AsyncData(
       current.copyWith(
-        posts: [...current.posts, ...posts],
+        posts: [...current.posts, ...newPosts],
         isLoadingMore: false,
         hasMore: posts.isNotEmpty,
       ),
@@ -59,7 +63,9 @@ class FeedController extends AsyncNotifier<FeedState> {
   Future<void> search(String query) async {
     final tags = ref.read(searchServiceProvider).parseTags(query);
     final current = state.value ?? const FeedState();
-    state = AsyncData(current.copyWith(selectedTags: tags, posts: []));
+    state = AsyncData(
+      current.copyWith(selectedTags: tags, posts: [], tagSuggestions: []),
+    );
     await ref.read(searchServiceProvider).saveSearch(query, 0);
     await refresh();
     final count = state.value?.posts.length ?? 0;
@@ -76,8 +82,13 @@ class FeedController extends AsyncNotifier<FeedState> {
     final result = await ref
         .read(searchServiceProvider)
         .autocompleteDetailed(lastToken, limit: 16);
+    final normalizedToken = lastToken.trim().toLowerCase();
     final suggestions = result is Success<List<TagSuggestion>>
         ? result.data
+            .where((item) => item.name.toLowerCase().startsWith(
+                  normalizedToken,
+                ))
+            .toList(growable: false)
         : const <TagSuggestion>[];
     state = AsyncData(current.copyWith(tagSuggestions: suggestions));
   }
@@ -138,6 +149,7 @@ class FeedController extends AsyncNotifier<FeedState> {
         ? <String?>[null]
         : current.selectedProviderIds;
     final posts = <Post>[];
+    final seen = <String>{};
     for (final providerId in providerIds) {
       final result = refresh
           ? await service.refresh(
@@ -152,7 +164,11 @@ class FeedController extends AsyncNotifier<FeedState> {
               providerId: providerId,
               topPeriod: current.topPeriodFilter,
             );
-      if (result is Success<List<Post>>) posts.addAll(result.data);
+      if (result is Success<List<Post>>) {
+        for (final post in result.data) {
+          if (seen.add(post.cacheKey)) posts.add(post);
+        }
+      }
     }
     return posts;
   }

lib/features/feed/presentation/feed_screen.dart

@@ -52,6 +52,7 @@ class _FeedScreenState extends ConsumerState<FeedScreen> {
     final settings =
         ref.watch(appSettingsProvider).value ?? AppSettings.defaults;
     final favoriteKeys = ref.watch(favoriteKeysProvider).value ?? <String>{};
+    final viewedKeys = ref.watch(viewedKeysProvider).value ?? <String>{};
 
     if (!_usedInitialQuery && (widget.initialQuery?.isNotEmpty ?? false)) {
       _usedInitialQuery = true;
@@ -165,6 +166,7 @@ class _FeedScreenState extends ConsumerState<FeedScreen> {
                             nsfwEnabled: settings.nsfwEnabled,
                             loading: state.isLoadingMore,
                             favoriteKeys: favoriteKeys,
+                            viewedKeys: viewedKeys,
                             onOpen: (post) => context.push(
                               '/post/${post.providerId}/${post.id}',
                               extra: post,

lib/features/feed/presentation/widgets/feed_toolbar.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/gestures.dart';
 
 import '../../../../app/responsive.dart';
 import '../../../../backend/backend.dart';
@@ -75,13 +76,18 @@ class _FeedToolbarState extends State<FeedToolbar> {
           Row(
             children: [
               Expanded(
-                child: AppSearchBar(
+                child: TagInputSearchBar(
                   initialValue: _query,
+                  suggestions: widget.tagSuggestions,
                   onChanged: (value) {
                     _query = value;
                     widget.onSearchChanged(value);
                   },
                   onSubmitted: widget.onSearch,
+                  onSuggestionApplied: (value) {
+                    _query = value;
+                    widget.onSuggestionTap(value);
+                  },
                 ),
               ),
               const SizedBox(width: 8),
@@ -108,10 +114,12 @@ class _FeedToolbarState extends State<FeedToolbar> {
             ],
           ),
           const SizedBox(height: 8),
-          SizedBox(
+          _HorizontalWheelScroller(
             height: 36,
-            child: ListView(
+            builder: (controller) => ListView(
+              controller: controller,
               scrollDirection: Axis.horizontal,
+              primary: false,
               children: [
                 if (widget.providers.isNotEmpty) ...[
                   FilterChip(
@@ -144,23 +152,6 @@ class _FeedToolbarState extends State<FeedToolbar> {
               ],
             ),
           ),
-          if (widget.tagSuggestions.isNotEmpty) ...[
-            const SizedBox(height: 8),
-            SizedBox(
-              height: 34,
-              child: ListView.separated(
-                scrollDirection: Axis.horizontal,
-                itemCount: widget.tagSuggestions.length,
-                separatorBuilder: (_, __) => const SizedBox(width: 8),
-                itemBuilder: (context, index) => ActionChip(
-                  avatar: const Icon(Icons.tag_rounded, size: 15),
-                  label: _SuggestionLabel(widget.tagSuggestions[index]),
-                  onPressed: () =>
-                      _applySuggestion(widget.tagSuggestions[index].name),
-                ),
-              ),
-            ),
-          ],
         ],
       ),
     );
@@ -171,19 +162,26 @@ class _FeedToolbarState extends State<FeedToolbar> {
       padding: const EdgeInsets.fromLTRB(8, 6, 8, 6),
       child: Column(
         children: [
-          AppSearchBar(
+          TagInputSearchBar(
             initialValue: _query,
+            suggestions: widget.tagSuggestions,
             onChanged: (value) {
               _query = value;
               widget.onSearchChanged(value);
             },
             onSubmitted: widget.onSearch,
+            onSuggestionApplied: (value) {
+              _query = value;
+              widget.onSuggestionTap(value);
+            },
           ),
           const SizedBox(height: 8),
-          SizedBox(
+          _HorizontalWheelScroller(
             height: 40,
-            child: ListView(
+            builder: (controller) => ListView(
+              controller: controller,
               scrollDirection: Axis.horizontal,
+              primary: false,
               children: [
                 IconButton.filledTonal(
                   tooltip: 'Providers',
@@ -230,10 +228,12 @@ class _FeedToolbarState extends State<FeedToolbar> {
             ),
           ),
           const SizedBox(height: 6),
-          SizedBox(
+          _HorizontalWheelScroller(
             height: 36,
-            child: ListView(
+            builder: (controller) => ListView(
+              controller: controller,
               scrollDirection: Axis.horizontal,
+              primary: false,
               children: [
                 for (final period in TopPeriodFilter.values) ...[
                   ChoiceChip(
@@ -246,59 +246,53 @@ class _FeedToolbarState extends State<FeedToolbar> {
               ],
             ),
           ),
-          if (widget.tagSuggestions.isNotEmpty) ...[
-            const SizedBox(height: 6),
-            SizedBox(
-              height: 34,
-              child: ListView.separated(
-                scrollDirection: Axis.horizontal,
-                itemCount: widget.tagSuggestions.length,
-                separatorBuilder: (_, __) => const SizedBox(width: 6),
-                itemBuilder: (context, index) => ActionChip(
-                  label: _SuggestionLabel(widget.tagSuggestions[index]),
-                  onPressed: () =>
-                      _applySuggestion(widget.tagSuggestions[index].name),
-                ),
-              ),
-            ),
-          ],
         ],
       ),
     );
   }
-
-  void _applySuggestion(String suggestion) {
-    final tokens = _query.trim().isEmpty
-        ? <String>[]
-        : _query.trim().split(RegExp(r'\s+'));
-    if (tokens.isEmpty) {
-      tokens.add(suggestion);
-    } else {
-      tokens[tokens.length - 1] = suggestion;
-    }
-    final next = tokens.toSet().join(' ');
-    setState(() => _query = next);
-    widget.onSuggestionTap(next);
-  }
 }
 
-class _SuggestionLabel extends StatelessWidget {
-  const _SuggestionLabel(this.suggestion);
+class _HorizontalWheelScroller extends StatefulWidget {
+  const _HorizontalWheelScroller({
+    required this.builder,
+    required this.height,
+  });
 
-  final TagSuggestion suggestion;
+  final Widget Function(ScrollController controller) builder;
+  final double height;
+
+  @override
+  State<_HorizontalWheelScroller> createState() =>
+      _HorizontalWheelScrollerState();
+}
+
+class _HorizontalWheelScrollerState extends State<_HorizontalWheelScroller> {
+  final _controller = ScrollController();
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
 
   @override
   Widget build(BuildContext context) {
-    return Row(
-      mainAxisSize: MainAxisSize.min,
-      children: [
-        Text(suggestion.name),
-        const SizedBox(width: 6),
-        Text(
-          suggestion.categoryLabel,
-          style: Theme.of(context).textTheme.labelSmall,
+    return SizedBox(
+      height: widget.height,
+      child: Listener(
+        onPointerSignal: (event) {
+          if (event is! PointerScrollEvent || !_controller.hasClients) return;
+          final target = (_controller.offset + event.scrollDelta.dy)
+              .clamp(0.0, _controller.position.maxScrollExtent)
+              .toDouble();
+          _controller.jumpTo(target);
+        },
+        child: Scrollbar(
+          controller: _controller,
+          thumbVisibility: false,
+          child: widget.builder(_controller),
+        ),
       ),
-      ],
     );
   }
 }

lib/features/post/presentation/post_details_screen.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
+import 'package:cached_network_image/cached_network_image.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import '../../../app/app.dart';
@@ -16,6 +17,7 @@ import '../../../shared/widgets/rating_badge.dart';
 import '../../collections/presentation/collection_form_dialog.dart';
 import '../../favorites/presentation/favorites_controller.dart';
 import '../../feed/presentation/feed_controller.dart';
+import '../../viewed/presentation/viewed_controller.dart';
 import 'post_details_controller.dart';
 import 'widgets/post_action_bar.dart';
 import 'widgets/post_media_viewer.dart';
@@ -69,6 +71,11 @@ class PostDetailsScreen extends ConsumerWidget {
         error: (error, _) => ErrorView(message: error.toString()),
         data: (post) {
           if (post == null) return const EmptyView(title: 'Post not found');
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            ref.read(viewedHistoryServiceProvider).markViewed(post);
+            ref.invalidate(viewedKeysProvider);
+            ref.invalidate(viewedControllerProvider);
+          });
           final currentIndex = feedPosts.indexWhere(
             (item) => item.providerId == post.providerId && item.id == post.id,
           );
@@ -99,7 +106,54 @@ class PostDetailsScreen extends ConsumerWidget {
               favoriteKeys,
             );
           }
-          return ListView(
+          return Shortcuts(
+            shortcuts: {
+              LogicalKeySet(LogicalKeyboardKey.arrowLeft):
+                  const _PreviousPostIntent(),
+              LogicalKeySet(LogicalKeyboardKey.arrowRight):
+                  const _NextPostIntent(),
+              LogicalKeySet(LogicalKeyboardKey.keyF):
+                  const _ToggleFavoriteIntent(),
+              LogicalKeySet(LogicalKeyboardKey.keyC):
+                  const _AddCollectionIntent(),
+              LogicalKeySet(LogicalKeyboardKey.escape): const _CloseIntent(),
+            },
+            child: Actions(
+              actions: {
+                _PreviousPostIntent: CallbackAction<_PreviousPostIntent>(
+                  onInvoke: (_) {
+                    if (previous != null) _openPost(context, previous);
+                    return null;
+                  },
+                ),
+                _NextPostIntent: CallbackAction<_NextPostIntent>(
+                  onInvoke: (_) {
+                    if (next != null) _openPost(context, next);
+                    return null;
+                  },
+                ),
+                _ToggleFavoriteIntent: CallbackAction<_ToggleFavoriteIntent>(
+                  onInvoke: (_) {
+                    _toggleFavorite(ref, post, favoriteKeys);
+                    return null;
+                  },
+                ),
+                _AddCollectionIntent: CallbackAction<_AddCollectionIntent>(
+                  onInvoke: (_) {
+                    _addToCollection(context, ref, post);
+                    return null;
+                  },
+                ),
+                _CloseIntent: CallbackAction<_CloseIntent>(
+                  onInvoke: (_) {
+                    _close(context);
+                    return null;
+                  },
+                ),
+              },
+              child: Focus(
+                autofocus: true,
+                child: ListView(
                   padding: const EdgeInsets.all(16),
                   children: [
                     Row(
@@ -122,20 +176,31 @@ class PostDetailsScreen extends ConsumerWidget {
                         ),
                         IconButton.filledTonal(
                           tooltip: 'Next',
-                    onPressed:
-                        next == null ? null : () => _openPost(context, next),
+                          onPressed: next == null
+                              ? null
+                              : () => _openPost(context, next),
                           icon: const Icon(Icons.chevron_right_rounded),
                         ),
                       ],
                     ),
+                    if (currentIndex >= 0) ...[
+                      const SizedBox(height: 10),
+                      _NeighborStrip(
+                        posts: feedPosts,
+                        currentIndex: currentIndex,
+                        onOpen: (post) => _openPost(context, post),
+                      ),
+                    ],
                     const SizedBox(height: 16),
                     PostActionBar(
                       isFavorite: favoriteKeys.contains(post.cacheKey),
-                onFavorite: () => _toggleFavorite(ref, post, favoriteKeys),
+                      onFavorite: () =>
+                          _toggleFavorite(ref, post, favoriteKeys),
                       onCollection: () => _addToCollection(context, ref, post),
                       onOpen: () => launchUrl(Uri.parse(post.fileUrl)),
                       onCopy: () =>
                           Clipboard.setData(ClipboardData(text: post.fileUrl)),
+                      onSimilar: () => _openSimilar(context, ref, post),
                       onDownload: settings.allowDownloads
                           ? () => _download(context, ref, post)
                           : null,
@@ -163,6 +228,9 @@ class PostDetailsScreen extends ConsumerWidget {
                     const SizedBox(height: 16),
                     _CommentsSection(post: post),
                   ],
+                ),
+              ),
+            ),
           );
         },
       ),
@@ -192,6 +260,7 @@ class PostDetailsScreen extends ConsumerWidget {
           onCollection: () => _addToCollection(context, ref, post),
           onOpen: () => launchUrl(Uri.parse(post.fileUrl)),
           onCopy: () => Clipboard.setData(ClipboardData(text: post.fileUrl)),
+          onSimilar: () => _openSimilar(context, ref, post),
           onDownload: settings.allowDownloads
               ? () => _download(context, ref, post)
               : null,
@@ -288,6 +357,13 @@ class PostDetailsScreen extends ConsumerWidget {
     _replacePost(context, post);
   }
 
+  void _openSimilar(BuildContext context, WidgetRef ref, Post post) {
+    final query = similarTagsFor(post).join(' ');
+    if (query.trim().isEmpty) return;
+    ref.read(feedControllerProvider.notifier).search(query);
+    context.go('/?q=${Uri.encodeQueryComponent(query)}');
+  }
+
   void _replacePost(BuildContext context, Post post) {
     context.replace('/post/${post.providerId}/${post.id}', extra: post);
   }
@@ -360,14 +436,6 @@ class _MobilePostPagerState extends State<_MobilePostPager> {
       onPageChanged: (index) {
         _currentIndex = index;
         _prefetchAround(index);
-        final post = widget.posts[index];
-        WidgetsBinding.instance.addPostFrameCallback((_) {
-          if (!mounted) return;
-          GoRouter.of(context).replace(
-            '/post/${post.providerId}/${post.id}',
-            extra: post,
-          );
-        });
       },
       itemBuilder: (context, index) {
         return _KeepAlivePostPage(
@@ -381,7 +449,7 @@ class _MobilePostPagerState extends State<_MobilePostPager> {
   }
 
   void _prefetchAround(int index) {
-    for (final offset in [-1, 0, 1]) {
+    for (final offset in [-2, -1, 0, 1, 2]) {
       final target = index + offset;
       if (target < 0 || target >= widget.posts.length) continue;
       final post = widget.posts[target];
@@ -391,10 +459,30 @@ class _MobilePostPagerState extends State<_MobilePostPager> {
         if (post.fileType.toLowerCase().contains('gif')) post.fileUrl,
       ].where((url) => url.trim().isNotEmpty).toSet();
       for (final url in urls) {
-        precacheImage(NetworkImage(url), context);
+        precacheImage(
+          CachedNetworkImageProvider(url, headers: _headersFor(post)),
+          context,
+        );
       }
     }
   }
+
+  Map<String, String> _headersFor(Post post) {
+    return {
+      'User-Agent': 'RuleGel/0.2 Flutter local booru browser',
+      'Accept': '*/*',
+      if (post.providerName.toLowerCase().contains('gelbooru') ||
+          post.fileUrl.contains('gelbooru.com') ||
+          post.sampleUrl.contains('gelbooru.com') ||
+          post.previewUrl.contains('gelbooru.com'))
+        'Referer': 'https://gelbooru.com/',
+      if (post.providerName.toLowerCase().contains('rule34') ||
+          post.fileUrl.contains('rule34') ||
+          post.sampleUrl.contains('rule34') ||
+          post.previewUrl.contains('rule34'))
+        'Referer': 'https://rule34.xxx/',
+    };
+  }
 }
 
 class _KeepAlivePostPage extends StatefulWidget {
@@ -418,6 +506,83 @@ class _KeepAlivePostPageState extends State<_KeepAlivePostPage>
   }
 }
 
+class _NeighborStrip extends StatelessWidget {
+  const _NeighborStrip({
+    required this.posts,
+    required this.currentIndex,
+    required this.onOpen,
+  });
+
+  final List<Post> posts;
+  final int currentIndex;
+  final ValueChanged<Post> onOpen;
+
+  @override
+  Widget build(BuildContext context) {
+    final start = (currentIndex - 3).clamp(0, posts.length);
+    final end = (currentIndex + 4).clamp(0, posts.length);
+    final visible = posts.sublist(start, end);
+    return SizedBox(
+      height: 72,
+      child: ListView.separated(
+        scrollDirection: Axis.horizontal,
+        itemCount: visible.length,
+        separatorBuilder: (_, __) => const SizedBox(width: 8),
+        itemBuilder: (context, index) {
+          final post = visible[index];
+          final selected = post.cacheKey == posts[currentIndex].cacheKey;
+          return InkWell(
+            onTap: () => onOpen(post),
+            borderRadius: BorderRadius.circular(8),
+            child: AnimatedContainer(
+              duration: const Duration(milliseconds: 140),
+              width: 72,
+              decoration: BoxDecoration(
+                borderRadius: BorderRadius.circular(8),
+                border: Border.all(
+                  color: selected
+                      ? Theme.of(context).colorScheme.primary
+                      : Colors.transparent,
+                  width: 2,
+                ),
+              ),
+              clipBehavior: Clip.antiAlias,
+              child: CachedNetworkImage(
+                imageUrl: post.previewUrl.isNotEmpty
+                    ? post.previewUrl
+                    : post.sampleUrl,
+                fit: BoxFit.cover,
+                errorWidget: (_, __, ___) =>
+                    const Center(child: Icon(Icons.broken_image_rounded)),
+              ),
+            ),
+          );
+        },
+      ),
+    );
+  }
+}
+
+class _PreviousPostIntent extends Intent {
+  const _PreviousPostIntent();
+}
+
+class _NextPostIntent extends Intent {
+  const _NextPostIntent();
+}
+
+class _ToggleFavoriteIntent extends Intent {
+  const _ToggleFavoriteIntent();
+}
+
+class _AddCollectionIntent extends Intent {
+  const _AddCollectionIntent();
+}
+
+class _CloseIntent extends Intent {
+  const _CloseIntent();
+}
+
 class _CommentsSection extends ConsumerStatefulWidget {
   const _CommentsSection({required this.post});
 
@@ -466,7 +631,7 @@ class _CommentsSectionState extends ConsumerState<_CommentsSection> {
                 alignment: Alignment.centerLeft,
                 child: Padding(
                   padding: EdgeInsets.only(bottom: 12),
-                  child: Text('Comments unavailable'),
+                  child: Text('No comments'),
                 ),
               );
             }

lib/features/post/presentation/widgets/post_action_bar.dart

@@ -8,6 +8,7 @@ class PostActionBar extends StatelessWidget {
     required this.onCopy,
     required this.isFavorite,
     this.onDownload,
+    this.onSimilar,
     super.key,
   });
 
@@ -17,6 +18,7 @@ class PostActionBar extends StatelessWidget {
   final VoidCallback onCopy;
   final bool isFavorite;
   final VoidCallback? onDownload;
+  final VoidCallback? onSimilar;
 
   @override
   Widget build(BuildContext context) {
@@ -36,6 +38,12 @@ class PostActionBar extends StatelessWidget {
           icon: const Icon(Icons.add_rounded),
           label: const Text('Collection'),
         ),
+        if (onSimilar != null)
+          FilledButton.tonalIcon(
+            onPressed: onSimilar,
+            icon: const Icon(Icons.auto_awesome_rounded),
+            label: const Text('Similar'),
+          ),
         IconButton.filledTonal(
           tooltip: 'Open original',
           onPressed: onOpen,

lib/features/providers/presentation/provider_check_screen.dart

@@ -15,6 +15,7 @@ class ProviderCheckScreen extends ConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) {
     final providers = ref.watch(providersControllerProvider);
     final health = ref.watch(providerHealthProvider);
+    final diagnostics = ref.watch(providerDiagnosticsProvider).value ?? {};
     return AdaptiveScaffold(
       title: 'Provider Check',
       actions: [
@@ -35,6 +36,7 @@ class ProviderCheckScreen extends ConsumerWidget {
             return ProviderHealthTile(
               config: item,
               health: health[item.id],
+              diagnostics: diagnostics[item.id],
               onCheck: () => _checkOne(ref, item.id),
             );
           },

lib/features/providers/presentation/provider_form_screen.dart

@@ -90,6 +90,9 @@ class _ProviderFormScreenState extends ConsumerState<ProviderFormScreen> {
                   value: 'rule34', child: Text('rule34-compatible')),
               DropdownMenuItem(
                   value: 'danbooru', child: Text('danbooru-compatible')),
+              DropdownMenuItem(
+                  value: 'moebooru', child: Text('moebooru-compatible')),
+              DropdownMenuItem(value: 'e621', child: Text('e621/e926')),
               DropdownMenuItem(value: 'custom', child: Text('custom')),
             ],
             onChanged: (value) =>

lib/features/providers/presentation/providers_controller.dart

@@ -38,3 +38,14 @@ class ProvidersController extends AsyncNotifier<List<ContentProviderConfig>> {
 
 final providerHealthProvider =
     StateProvider<Map<String, ProviderHealth>>((ref) => {});
+
+final providerDiagnosticsProvider =
+    FutureProvider<Map<String, ProviderDiagnostics>>((ref) async {
+  final result = await ref.watch(providerRepositoryProvider).getDiagnostics();
+  if (result is Success<List<ProviderDiagnostics>>) {
+    return {
+      for (final item in result.data) item.providerId: item,
+    };
+  }
+  return {};
+});

lib/features/providers/presentation/widgets/provider_health_tile.dart

@@ -7,12 +7,14 @@ class ProviderHealthTile extends StatelessWidget {
   const ProviderHealthTile({
     required this.config,
     required this.health,
+    required this.diagnostics,
     required this.onCheck,
     super.key,
   });
 
   final ContentProviderConfig config;
   final ProviderHealth? health;
+  final ProviderDiagnostics? diagnostics;
   final VoidCallback onCheck;
 
   @override
@@ -22,11 +24,19 @@ class ProviderHealthTile extends StatelessWidget {
         title: Text(config.name),
         subtitle: Text(
           [
+            '${config.apiType} | ${config.enabled ? 'enabled' : 'disabled'} | priority ${config.priority}',
             if (health != null) 'Ping ${health!.pingMs} ms',
+            if (health?.apiVersion != null) 'API ${health!.apiVersion}',
             if (health?.lastCheckedAt != null)
               'Checked ${health!.lastCheckedAt}',
+            if (diagnostics != null)
+              'Last search: ${diagnostics!.lastResultCount} posts at ${diagnostics!.lastSearchAt}',
+            if (diagnostics?.lastErrorMessage != null)
+              diagnostics!.lastErrorMessage!,
             if (health?.errorMessage != null) health!.errorMessage!,
           ].join('\n'),
+          maxLines: 7,
+          overflow: TextOverflow.ellipsis,
         ),
         leading: ProviderStatusBadge(health: health),
         trailing: IconButton(

lib/features/search/presentation/search_screen.dart

@@ -7,7 +7,6 @@ import '../../../shared/widgets/app_search_bar.dart';
 import '../../../shared/widgets/error_view.dart';
 import 'search_controller.dart';
 import 'widgets/recent_searches.dart';
-import 'widgets/search_suggestions.dart';
 
 class SearchScreen extends ConsumerWidget {
   const SearchScreen({super.key});
@@ -31,22 +30,20 @@ class SearchScreen extends ConsumerWidget {
         data: (data) => ListView(
           padding: const EdgeInsets.all(16),
           children: [
-            AppSearchBar(
+            TagInputSearchBar(
+              initialValue: data.query,
+              suggestions: data.suggestions,
               onSubmitted: (query) =>
                   context.go('/?q=${Uri.encodeQueryComponent(query)}'),
               onChanged: (query) => ref
                   .read(searchControllerProvider.notifier)
                   .updateQuery(query),
+              onSuggestionApplied: (query) => ref
+                  .read(searchControllerProvider.notifier)
+                  .updateQuery(query),
             ),
             const SizedBox(height: 16),
-            SearchSuggestions(
-              suggestions: data.suggestions,
-              onTap: (suggestion) {
-                final query = _applySuggestion(data.query, suggestion);
-                context.go('/?q=${Uri.encodeQueryComponent(query)}');
-              },
-            ),
-            const SizedBox(height: 24),
+            const SizedBox(height: 8),
             Text('Recent', style: Theme.of(context).textTheme.titleLarge),
             const SizedBox(height: 8),
             RecentSearches(
@@ -59,15 +56,4 @@ class SearchScreen extends ConsumerWidget {
       ),
     );
   }
-
-  String _applySuggestion(String query, String suggestion) {
-    final tokens =
-        query.trim().isEmpty ? <String>[] : query.trim().split(RegExp(r'\s+'));
-    if (tokens.isEmpty) {
-      tokens.add(suggestion);
-    } else {
-      tokens[tokens.length - 1] = suggestion;
-    }
-    return tokens.toSet().join(' ');
-  }
 }

lib/features/settings/presentation/settings_controller.dart

@@ -25,6 +25,11 @@ class SettingsController extends AsyncNotifier<AppSettings> {
     await ref.read(cacheServiceProvider).clear();
   }
 
+  Future<void> clearViewedHistory() async {
+    await ref.read(viewedHistoryServiceProvider).clearHistory();
+    ref.invalidate(viewedKeysProvider);
+  }
+
   Future<String> exportJson() async {
     final result =
         await ref.read(settingsServiceProvider).exportSettingsToJson();

lib/features/settings/presentation/settings_screen.dart

@@ -57,6 +57,35 @@ class SettingsScreen extends ConsumerWidget {
               onChanged: (value) =>
                   _update(ref, settings.copyWith(allowDownloads: value)),
             ),
+            SwitchListTile(
+              value: settings.hideViewedPosts,
+              title: const Text('Hide viewed posts'),
+              onChanged: (value) =>
+                  _update(ref, settings.copyWith(hideViewedPosts: value)),
+            ),
+            const SizedBox(height: 12),
+            _TagListEditor(
+              title: 'Smart blacklist',
+              icon: Icons.visibility_off_rounded,
+              tags: settings.smartBlacklistRules,
+              helper:
+                  'Examples: tag, tag_a tag_b, provider:e621, rating:explicit, type:video, score:<10, artist:name',
+              onChanged: (tags) => _update(
+                ref,
+                settings.copyWith(smartBlacklistRules: tags),
+              ),
+            ),
+            const SizedBox(height: 12),
+            _TagListEditor(
+              title: 'Whitelisted tags',
+              icon: Icons.verified_rounded,
+              tags: settings.whitelistedTags,
+              onChanged: (tags) => _update(
+                ref,
+                settings.copyWith(whitelistedTags: tags),
+              ),
+            ),
+            const SizedBox(height: 12),
             _StepperTile(
               title: 'Desktop columns',
               value: settings.desktopColumns,
@@ -94,6 +123,14 @@ class SettingsScreen extends ConsumerWidget {
               label: const Text('Clear cache'),
             ),
             const SizedBox(height: 12),
+            FilledButton.tonalIcon(
+              onPressed: () => ref
+                  .read(settingsControllerProvider.notifier)
+                  .clearViewedHistory(),
+              icon: const Icon(Icons.history_toggle_off_rounded),
+              label: const Text('Clear viewed history'),
+            ),
+            const SizedBox(height: 12),
             FilledButton.tonalIcon(
               onPressed: () async {
                 final json = await ref
@@ -160,6 +197,112 @@ class SettingsScreen extends ConsumerWidget {
   }
 }
 
+class _TagListEditor extends StatefulWidget {
+  const _TagListEditor({
+    required this.title,
+    required this.icon,
+    required this.tags,
+    required this.onChanged,
+    this.helper,
+  });
+
+  final String title;
+  final IconData icon;
+  final List<String> tags;
+  final ValueChanged<List<String>> onChanged;
+  final String? helper;
+
+  @override
+  State<_TagListEditor> createState() => _TagListEditorState();
+}
+
+class _TagListEditorState extends State<_TagListEditor> {
+  final _controller = TextEditingController();
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return DecoratedBox(
+      decoration: BoxDecoration(
+        border: Border.all(color: Theme.of(context).colorScheme.outlineVariant),
+        borderRadius: BorderRadius.circular(12),
+      ),
+      child: Padding(
+        padding: const EdgeInsets.all(12),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Row(
+              children: [
+                Icon(widget.icon, size: 20),
+                const SizedBox(width: 8),
+                Text(
+                  widget.title,
+                  style: Theme.of(context).textTheme.titleMedium,
+                ),
+              ],
+            ),
+            if (widget.helper != null) ...[
+              const SizedBox(height: 6),
+              Text(
+                widget.helper!,
+                style: Theme.of(context).textTheme.bodySmall,
+              ),
+            ],
+            const SizedBox(height: 10),
+            Wrap(
+              spacing: 8,
+              runSpacing: 8,
+              children: [
+                for (final tag in widget.tags)
+                  InputChip(
+                    label: Text(tag),
+                    onDeleted: () => widget.onChanged(
+                      widget.tags.where((item) => item != tag).toList(),
+                    ),
+                  ),
+                SizedBox(
+                  width: 240,
+                  child: TextField(
+                    controller: _controller,
+                    decoration: const InputDecoration(
+                      isDense: true,
+                      hintText: 'Add tags',
+                      prefixIcon: Icon(Icons.tag_rounded),
+                    ),
+                    textInputAction: TextInputAction.done,
+                    onSubmitted: (_) => _submit(),
+                  ),
+                ),
+                IconButton.filledTonal(
+                  tooltip: 'Add tags',
+                  onPressed: _submit,
+                  icon: const Icon(Icons.add_rounded),
+                ),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  void _submit() {
+    final incoming = _controller.text
+        .split(RegExp(r'\s+'))
+        .map((tag) => tag.trim().toLowerCase())
+        .where((tag) => tag.isNotEmpty);
+    final merged = <String>{...widget.tags, ...incoming}.toList()..sort();
+    _controller.clear();
+    widget.onChanged(merged);
+  }
+}
+
 class _StepperTile extends StatelessWidget {
   const _StepperTile({
     required this.title,

lib/features/viewed/presentation/viewed_controller.dart

@@ -0,0 +1,28 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+
+import '../../../backend/backend.dart';
+import '../../../core/utils/result.dart';
+
+final viewedControllerProvider =
+    AsyncNotifierProvider<ViewedController, List<Post>>(ViewedController.new);
+
+class ViewedController extends AsyncNotifier<List<Post>> {
+  @override
+  Future<List<Post>> build() => _load();
+
+  Future<void> refresh() async {
+    state = AsyncData(await _load());
+  }
+
+  Future<void> clear() async {
+    await ref.read(viewedHistoryServiceProvider).clearHistory();
+    ref.invalidate(viewedKeysProvider);
+    state = const AsyncData([]);
+  }
+
+  Future<List<Post>> _load() async {
+    final result =
+        await ref.read(viewedHistoryServiceProvider).getViewedPosts();
+    return result is Success<List<Post>> ? result.data : const [];
+  }
+}

lib/features/viewed/presentation/viewed_screen.dart

@@ -0,0 +1,73 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:go_router/go_router.dart';
+
+import '../../../app/app.dart';
+import '../../../app/responsive.dart';
+import '../../../backend/backend.dart';
+import '../../../shared/widgets/adaptive_scaffold.dart';
+import '../../../shared/widgets/empty_view.dart';
+import '../../../shared/widgets/error_view.dart';
+import '../../../shared/widgets/post_masonry_grid.dart';
+import '../../favorites/presentation/favorites_controller.dart';
+import 'viewed_controller.dart';
+
+class ViewedScreen extends ConsumerWidget {
+  const ViewedScreen({super.key});
+
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final state = ref.watch(viewedControllerProvider);
+    final settings =
+        ref.watch(appSettingsProvider).value ?? AppSettings.defaults;
+    final favoriteKeys = ref.watch(favoriteKeysProvider).value ?? <String>{};
+    final viewedKeys = ref.watch(viewedKeysProvider).value ?? <String>{};
+    return AdaptiveScaffold(
+      title: 'Viewed',
+      actions: [
+        IconButton(
+          tooltip: 'Clear viewed history',
+          onPressed: () => ref.read(viewedControllerProvider.notifier).clear(),
+          icon: const Icon(Icons.history_toggle_off_rounded),
+        ),
+      ],
+      body: state.when(
+        loading: () => const Center(child: CircularProgressIndicator()),
+        error: (error, _) => ErrorView(message: error.toString()),
+        data: (posts) => posts.isEmpty
+            ? const EmptyView(title: 'No viewed posts yet')
+            : RefreshIndicator(
+                onRefresh: () =>
+                    ref.read(viewedControllerProvider.notifier).refresh(),
+                child: PostMasonryGrid(
+                  posts: posts,
+                  columns: Responsive.columnsFor(
+                    context,
+                    mobileColumns: settings.mobileColumns,
+                    desktopColumns: settings.desktopColumns,
+                  ),
+                  blurExplicit: settings.blurExplicitContent,
+                  showBadges: settings.showPostBadges,
+                  nsfwEnabled: settings.nsfwEnabled,
+                  favoriteKeys: favoriteKeys,
+                  viewedKeys: viewedKeys,
+                  onOpen: (post) => context.push(
+                    '/post/${post.providerId}/${post.id}',
+                    extra: post,
+                  ),
+                  onFavorite: (post) async {
+                    if (favoriteKeys.contains(post.cacheKey)) {
+                      await ref
+                          .read(favoriteServiceProvider)
+                          .removeFavorite(post.id, post.providerId);
+                    } else {
+                      await ref.read(favoriteServiceProvider).addFavorite(post);
+                    }
+                    ref.invalidate(favoriteKeysProvider);
+                  },
+                ),
+              ),
+      ),
+    );
+  }
+}

lib/shared/widgets/app_search_bar.dart

@@ -1,6 +1,9 @@
 import 'dart:async';
 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+import '../../backend/backend.dart';
 
 class AppSearchBar extends StatefulWidget {
   const AppSearchBar({
@@ -20,29 +23,449 @@ class AppSearchBar extends StatefulWidget {
   State<AppSearchBar> createState() => _AppSearchBarState();
 }
 
-class _AppSearchBarState extends State<AppSearchBar> {
+class TagInputSearchBar extends StatefulWidget {
+  const TagInputSearchBar({
+    required this.onSubmitted,
+    this.onChanged,
+    this.onSuggestionApplied,
+    this.initialValue,
+    this.hintText = 'Search tags',
+    this.suggestions = const [],
+    super.key,
+  });
+
+  final ValueChanged<String> onSubmitted;
+  final ValueChanged<String>? onChanged;
+  final ValueChanged<String>? onSuggestionApplied;
+  final String? initialValue;
+  final String hintText;
+  final List<TagSuggestion> suggestions;
+
+  @override
+  State<TagInputSearchBar> createState() => _TagInputSearchBarState();
+}
+
+class _TagInputSearchBarState extends State<TagInputSearchBar> {
   late final TextEditingController _controller;
+  late final FocusNode _focusNode;
   Timer? _debounce;
+  List<String> _tags = [];
 
   @override
   void initState() {
     super.initState();
-    _controller = TextEditingController(text: widget.initialValue);
+    _controller = TextEditingController();
+    _focusNode = FocusNode();
+    _focusNode.addListener(_handleFocusChanged);
+    _setFromQuery(widget.initialValue ?? '');
   }
 
   @override
-  void didUpdateWidget(covariant AppSearchBar oldWidget) {
+  void didUpdateWidget(covariant TagInputSearchBar oldWidget) {
     super.didUpdateWidget(oldWidget);
     final next = widget.initialValue ?? '';
-    if (oldWidget.initialValue != widget.initialValue &&
-        _controller.text != next) {
-      _controller.text = next;
+    if (!_focusNode.hasFocus && oldWidget.initialValue != next) {
+      _setFromQuery(next);
     }
   }
 
   @override
   void dispose() {
     _debounce?.cancel();
+    _focusNode.removeListener(_handleFocusChanged);
+    _focusNode.dispose();
+    _controller.dispose();
+    super.dispose();
+  }
+
+  void _handleFocusChanged() {
+    if (mounted) setState(() {});
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+    return Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        DecoratedBox(
+          decoration: BoxDecoration(
+            color: Theme.of(context).inputDecorationTheme.fillColor ??
+                scheme.surfaceContainerHighest.withValues(alpha: 0.38),
+            borderRadius: BorderRadius.circular(12),
+            border: Border.all(
+              color: _focusNode.hasFocus
+                  ? scheme.primary.withValues(alpha: 0.45)
+                  : Colors.transparent,
+            ),
+          ),
+          child: InkWell(
+            borderRadius: BorderRadius.circular(12),
+            onTap: _focusNode.requestFocus,
+            child: Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 7),
+              child: Row(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Padding(
+                    padding: const EdgeInsets.only(top: 7),
+                    child: Icon(Icons.search_rounded,
+                        color: scheme.onSurfaceVariant),
+                  ),
+                  const SizedBox(width: 8),
+                  Expanded(
+                    child: Wrap(
+                      spacing: 6,
+                      runSpacing: 6,
+                      crossAxisAlignment: WrapCrossAlignment.center,
+                      children: [
+                        for (final tag in _tags) _buildTagChip(context, tag),
+                        ConstrainedBox(
+                          constraints: const BoxConstraints(
+                            minWidth: 120,
+                            maxWidth: 320,
+                          ),
+                          child: Focus(
+                            onKeyEvent: _handleKeyEvent,
+                            child: TextField(
+                              controller: _controller,
+                              focusNode: _focusNode,
+                              autocorrect: false,
+                              enableSuggestions: false,
+                              textInputAction: TextInputAction.search,
+                              inputFormatters: [
+                                _TagCommitFormatter(onCommit: _commitDraft),
+                              ],
+                              onSubmitted: (_) => _submit(),
+                              onChanged: (_) => _notifyChangedDebounced(),
+                              decoration: InputDecoration(
+                                isDense: true,
+                                border: InputBorder.none,
+                                enabledBorder: InputBorder.none,
+                                focusedBorder: InputBorder.none,
+                                filled: false,
+                                contentPadding:
+                                    const EdgeInsets.symmetric(vertical: 8),
+                                hintText:
+                                    _tags.isEmpty ? widget.hintText : 'tag',
+                                prefixIcon: null,
+                                suffixIcon: null,
+                              ),
+                            ),
+                          ),
+                        ),
+                      ],
+                    ),
+                  ),
+                  IconButton(
+                    tooltip: 'Clear',
+                    visualDensity: VisualDensity.compact,
+                    icon: const Icon(Icons.close_rounded),
+                    onPressed: _clear,
+                  ),
+                ],
+              ),
+            ),
+          ),
+        ),
+        if (widget.suggestions.isNotEmpty) ...[
+          const SizedBox(height: 8),
+          _TagSuggestionDropdown(
+            suggestions: widget.suggestions,
+            onSelected: _applySuggestion,
+          ),
+        ],
+      ],
+    );
+  }
+
+  Widget _buildTagChip(BuildContext context, String tag) {
+    final scheme = Theme.of(context).colorScheme;
+    return InputChip(
+      label: Text(tag),
+      avatar: const Icon(Icons.tag_rounded, size: 16),
+      deleteIcon: const Icon(Icons.close_rounded, size: 16),
+      onPressed: () => _editTag(tag),
+      onDeleted: () => _removeTag(tag),
+      backgroundColor: scheme.primaryContainer.withValues(alpha: 0.54),
+      labelStyle: TextStyle(
+        color: scheme.onPrimaryContainer,
+        fontWeight: FontWeight.w700,
+      ),
+      side: BorderSide(color: scheme.primary.withValues(alpha: 0.18)),
+      visualDensity: VisualDensity.compact,
+      materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
+    );
+  }
+
+  KeyEventResult _handleKeyEvent(FocusNode node, KeyEvent event) {
+    if (event is! KeyDownEvent) return KeyEventResult.ignored;
+    if (event.logicalKey != LogicalKeyboardKey.backspace) {
+      return KeyEventResult.ignored;
+    }
+    if (_controller.text.isNotEmpty || _tags.isEmpty) {
+      return KeyEventResult.ignored;
+    }
+    final tag = _tags.removeLast();
+    _controller.value = TextEditingValue(
+      text: tag,
+      selection: TextSelection.collapsed(offset: tag.length),
+    );
+    setState(() {});
+    _notifyChanged();
+    return KeyEventResult.handled;
+  }
+
+  void _setFromQuery(String query) {
+    _tags = _parseTags(query);
+    _controller.clear();
+  }
+
+  void _commitDraft(String value) {
+    final additions = _parseTags(value);
+    if (additions.isEmpty) return;
+    setState(() {
+      for (final tag in additions) {
+        if (!_tags.contains(tag)) _tags.add(tag);
+      }
+      _controller.clear();
+    });
+    _notifyChanged();
+  }
+
+  void _submit() {
+    _debounce?.cancel();
+    _commitDraft(_controller.text);
+    widget.onSubmitted(_query);
+  }
+
+  void _clear() {
+    _debounce?.cancel();
+    setState(() {
+      _tags = [];
+      _controller.clear();
+    });
+    _notifyChanged();
+    _focusNode.requestFocus();
+  }
+
+  void _editTag(String tag) {
+    setState(() {
+      _tags = _tags.where((item) => item != tag).toList(growable: true);
+      _controller.value = TextEditingValue(
+        text: tag,
+        selection: TextSelection.collapsed(offset: tag.length),
+      );
+    });
+    _notifyChanged();
+    _focusNode.requestFocus();
+  }
+
+  void _removeTag(String tag) {
+    setState(() {
+      _tags = _tags.where((item) => item != tag).toList(growable: true);
+    });
+    _notifyChanged();
+  }
+
+  void _applySuggestion(String suggestion) {
+    final draft = _controller.text.trim();
+    setState(() {
+      if (draft.isNotEmpty) {
+        final draftTags = _parseTags(draft);
+        _tags.removeWhere(draftTags.contains);
+      }
+      if (!_tags.contains(suggestion)) _tags.add(suggestion);
+      _controller.clear();
+    });
+    _notifyChanged();
+    widget.onSuggestionApplied?.call(_query);
+    _focusNode.requestFocus();
+  }
+
+  void _notifyChangedDebounced() {
+    _debounce?.cancel();
+    _debounce = Timer(const Duration(milliseconds: 250), _notifyChanged);
+  }
+
+  void _notifyChanged() {
+    widget.onChanged?.call(_query);
+  }
+
+  List<String> _parseTags(String query) {
+    final seen = <String>{};
+    final result = <String>[];
+    for (final raw in query.trim().split(RegExp(r'\s+'))) {
+      final tag = raw.trim();
+      if (tag.isEmpty || !seen.add(tag)) continue;
+      result.add(tag);
+    }
+    return result;
+  }
+
+  String get _query {
+    final draft = _controller.text.trim();
+    final all = [..._tags, if (draft.isNotEmpty) draft];
+    return all.join(' ');
+  }
+}
+
+class _TagCommitFormatter extends TextInputFormatter {
+  _TagCommitFormatter({required this.onCommit});
+
+  final ValueChanged<String> onCommit;
+
+  @override
+  TextEditingValue formatEditUpdate(
+    TextEditingValue oldValue,
+    TextEditingValue newValue,
+  ) {
+    if (newValue.text.endsWith(' ') || newValue.text.endsWith('\n')) {
+      final value = newValue.text.trim();
+      WidgetsBinding.instance.addPostFrameCallback((_) => onCommit(value));
+      return const TextEditingValue();
+    }
+    return newValue;
+  }
+}
+
+class _TagSuggestionDropdown extends StatelessWidget {
+  const _TagSuggestionDropdown({
+    required this.suggestions,
+    required this.onSelected,
+  });
+
+  final List<TagSuggestion> suggestions;
+  final ValueChanged<String> onSelected;
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+    return Align(
+      alignment: Alignment.centerLeft,
+      child: ConstrainedBox(
+        constraints: const BoxConstraints(maxWidth: 620),
+        child: Material(
+          elevation: 8,
+          shadowColor: Colors.black.withValues(alpha: 0.18),
+          color: scheme.surface,
+          borderRadius: BorderRadius.circular(16),
+          clipBehavior: Clip.antiAlias,
+          child: ListView.separated(
+            shrinkWrap: true,
+            padding: const EdgeInsets.symmetric(vertical: 6),
+            itemCount: suggestions.length > 8 ? 8 : suggestions.length,
+            separatorBuilder: (_, __) => Divider(
+              height: 1,
+              indent: 52,
+              color: scheme.outlineVariant.withValues(alpha: 0.55),
+            ),
+            itemBuilder: (context, index) {
+              final suggestion = suggestions[index];
+              return InkWell(
+                onTap: () => onSelected(suggestion.name),
+                child: Padding(
+                  padding:
+                      const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
+                  child: Row(
+                    children: [
+                      Icon(Icons.tag_rounded, color: scheme.primary, size: 20),
+                      const SizedBox(width: 14),
+                      Expanded(
+                        child: Text(
+                          suggestion.name,
+                          maxLines: 1,
+                          overflow: TextOverflow.ellipsis,
+                          style: Theme.of(context).textTheme.bodyLarge,
+                        ),
+                      ),
+                      const SizedBox(width: 10),
+                      _TagSuggestionBadge(suggestion.categoryLabel),
+                      if (suggestion.postCount > 0) ...[
+                        const SizedBox(width: 8),
+                        Text(
+                          _compactCount(suggestion.postCount),
+                          style:
+                              Theme.of(context).textTheme.labelMedium?.copyWith(
+                                    color: scheme.onSurfaceVariant,
+                                  ),
+                        ),
+                      ],
+                    ],
+                  ),
+                ),
+              );
+            },
+          ),
+        ),
+      ),
+    );
+  }
+
+  String _compactCount(int value) {
+    if (value >= 1000000) return '${(value / 1000000).toStringAsFixed(1)}M';
+    if (value >= 1000) return '${(value / 1000).toStringAsFixed(1)}K';
+    return '$value';
+  }
+}
+
+class _TagSuggestionBadge extends StatelessWidget {
+  const _TagSuggestionBadge(this.label);
+
+  final String label;
+
+  @override
+  Widget build(BuildContext context) {
+    final scheme = Theme.of(context).colorScheme;
+    return DecoratedBox(
+      decoration: BoxDecoration(
+        color: scheme.primaryContainer.withValues(alpha: 0.55),
+        borderRadius: BorderRadius.circular(999),
+      ),
+      child: Padding(
+        padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 3),
+        child: Text(
+          label,
+          style: Theme.of(context).textTheme.labelSmall?.copyWith(
+                color: scheme.onPrimaryContainer,
+                fontWeight: FontWeight.w700,
+              ),
+        ),
+      ),
+    );
+  }
+}
+
+class _AppSearchBarState extends State<AppSearchBar> {
+  late final TextEditingController _controller;
+  late final FocusNode _focusNode;
+  Timer? _debounce;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = TextEditingController(text: widget.initialValue);
+    _focusNode = FocusNode();
+  }
+
+  @override
+  void didUpdateWidget(covariant AppSearchBar oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    final next = widget.initialValue ?? '';
+    if (_focusNode.hasFocus) return;
+    if (oldWidget.initialValue != widget.initialValue &&
+        _controller.text != next) {
+      _controller.value = TextEditingValue(
+        text: next,
+        selection: TextSelection.collapsed(offset: next.length),
+      );
+    }
+  }
+
+  @override
+  void dispose() {
+    _debounce?.cancel();
+    _focusNode.dispose();
     _controller.dispose();
     super.dispose();
   }
@@ -51,8 +474,14 @@ class _AppSearchBarState extends State<AppSearchBar> {
   Widget build(BuildContext context) {
     return TextField(
       controller: _controller,
+      focusNode: _focusNode,
+      autocorrect: false,
+      enableSuggestions: false,
       textInputAction: TextInputAction.search,
-      onSubmitted: widget.onSubmitted,
+      onSubmitted: (value) {
+        _debounce?.cancel();
+        widget.onSubmitted(value);
+      },
       onChanged: (value) {
         _debounce?.cancel();
         _debounce = Timer(const Duration(milliseconds: 250), () {
@@ -66,8 +495,10 @@ class _AppSearchBarState extends State<AppSearchBar> {
           tooltip: 'Clear',
           icon: const Icon(Icons.close_rounded),
           onPressed: () {
+            _debounce?.cancel();
             _controller.clear();
             widget.onChanged?.call('');
+            _focusNode.requestFocus();
           },
         ),
       ),

lib/shared/widgets/app_shell.dart

@@ -13,6 +13,7 @@ class AppShell extends StatelessWidget {
     _Destination('Feed', Icons.dashboard_rounded, '/'),
     _Destination('Search', Icons.search_rounded, '/search'),
     _Destination('Favorites', Icons.favorite_rounded, '/favorites'),
+    _Destination('Viewed', Icons.history_rounded, '/viewed'),
     _Destination(
         'Collections', Icons.collections_bookmark_rounded, '/collections'),
     _Destination('Providers', Icons.hub_rounded, '/providers'),

lib/shared/widgets/post_card.dart

@@ -12,6 +12,7 @@ class PostCard extends StatefulWidget {
     required this.blurExplicit,
     required this.showBadges,
     required this.isFavorite,
+    required this.isViewed,
     required this.onOpen,
     required this.onFavorite,
     this.onAddToCollection,
@@ -22,6 +23,7 @@ class PostCard extends StatefulWidget {
   final bool blurExplicit;
   final bool showBadges;
   final bool isFavorite;
+  final bool isViewed;
   final VoidCallback onOpen;
   final VoidCallback onFavorite;
   final VoidCallback? onAddToCollection;
@@ -110,6 +112,12 @@ class _PostCardState extends State<PostCard> {
                   bottom: 8,
                   child: _MediaBadge(fileType: post.fileType),
                 ),
+                if (widget.isViewed)
+                  const Positioned(
+                    right: 8,
+                    bottom: 8,
+                    child: _SeenBadge(),
+                  ),
               ],
               if (mobile)
                 Positioned(
@@ -279,6 +287,34 @@ class _MediaBadge extends StatelessWidget {
       };
 }
 
+class _SeenBadge extends StatelessWidget {
+  const _SeenBadge();
+
+  @override
+  Widget build(BuildContext context) {
+    return DecoratedBox(
+      decoration: BoxDecoration(
+        color: Colors.black.withValues(alpha: 0.55),
+        borderRadius: BorderRadius.circular(6),
+      ),
+      child: const Padding(
+        padding: EdgeInsets.symmetric(horizontal: 7, vertical: 3),
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(Icons.visibility_rounded, size: 12, color: Colors.white),
+            SizedBox(width: 4),
+            Text(
+              'seen',
+              style: TextStyle(fontSize: 11, color: Colors.white),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
 Future<void> showAddToCollectionPicker(
   BuildContext context, {
   required List<Collection> collections,

lib/shared/widgets/post_masonry_grid.dart

@@ -17,6 +17,7 @@ class PostMasonryGrid extends StatelessWidget {
     required this.onFavorite,
     this.onAddToCollection,
     this.favoriteKeys = const {},
+    this.viewedKeys = const {},
     this.loading = false,
     this.controller,
     super.key,
@@ -31,6 +32,7 @@ class PostMasonryGrid extends StatelessWidget {
   final ValueChanged<Post> onFavorite;
   final ValueChanged<Post>? onAddToCollection;
   final Set<String> favoriteKeys;
+  final Set<String> viewedKeys;
   final bool loading;
   final ScrollController? controller;
 
@@ -52,6 +54,7 @@ class PostMasonryGrid extends StatelessWidget {
           blurExplicit: blurExplicit && !nsfwEnabled,
           showBadges: showBadges,
           isFavorite: favoriteKeys.contains(post.cacheKey),
+          isViewed: viewedKeys.contains(post.cacheKey),
           onOpen: () => onOpen(post),
           onFavorite: () => onFavorite(post),
           onAddToCollection:

pubspec.lock

@@ -1236,6 +1236,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.3"
+  webview_windows:
+    dependency: "direct main"
+    description:
+      name: webview_windows
+      sha256: "47fcad5875a45db29dbb5c9e6709bf5c88dcc429049872701343f91ed7255730"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.4.0"
   win32:
     dependency: transitive
     description:

pubspec.yaml

@@ -30,6 +30,7 @@ dependencies:
   file_selector: ^1.0.3
   path: ^1.9.0
   media_kit_libs_android_video: ^1.3.8
+  webview_windows: ^0.4.0
 
 dev_dependencies:
   flutter_test:

test/backend/feed_tag_filter_test.dart

@@ -0,0 +1,75 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:gel_rule_app/backend/models/post.dart';
+import 'package:gel_rule_app/backend/services/feed_service.dart';
+import 'package:gel_rule_app/backend/services/settings_service.dart';
+
+void main() {
+  group('feed tag filters', () {
+    test('blacklist hides matching posts', () {
+      final post = _post(tags: ['solo', 'blocked_tag']);
+      final settings = AppSettings.defaults.copyWith(
+        blacklistedTags: ['blocked_tag'],
+      );
+
+      expect(postPassesTagFilters(post, settings), isFalse);
+    });
+
+    test('whitelist allows only matching posts', () {
+      final settings = AppSettings.defaults.copyWith(
+        whitelistedTags: ['favorite_tag'],
+      );
+
+      expect(
+        postPassesTagFilters(_post(tags: ['favorite_tag']), settings),
+        isTrue,
+      );
+      expect(
+        postPassesTagFilters(_post(tags: ['other_tag']), settings),
+        isFalse,
+      );
+    });
+
+    test('tag groups participate in filtering', () {
+      final post = _post(
+        tags: ['general'],
+        tagGroups: {
+          'artist': ['artist_name'],
+        },
+      );
+      final settings = AppSettings.defaults.copyWith(
+        blacklistedTags: ['artist_name'],
+      );
+
+      expect(postPassesTagFilters(post, settings), isFalse);
+    });
+
+    test('requested search tags are all required', () {
+      final post = _post(tags: ['touhou', 'hakurei_reimu']);
+
+      expect(postMatchesRequestedTags(post, ['touhou']), isTrue);
+      expect(postMatchesRequestedTags(post, ['touhou', 'cirno']), isFalse);
+    });
+  });
+}
+
+Post _post({
+  required List<String> tags,
+  Map<String, List<String>> tagGroups = const {},
+}) {
+  return Post(
+    id: '1',
+    providerId: 'test',
+    providerName: 'Test',
+    previewUrl: 'https://example.test/preview.jpg',
+    sampleUrl: 'https://example.test/sample.jpg',
+    fileUrl: 'https://example.test/file.jpg',
+    tags: tags,
+    rating: 'general',
+    width: 100,
+    height: 100,
+    createdAt: DateTime(2026),
+    fileType: 'photo',
+    score: 1,
+    tagGroups: tagGroups,
+  );
+}

test/backend/isar_integration_test.dart

@@ -6,8 +6,10 @@ import 'package:gel_rule_app/backend/repositories/collection_repository.dart';
 import 'package:gel_rule_app/backend/repositories/favorite_repository.dart';
 import 'package:gel_rule_app/backend/repositories/post_repository.dart';
 import 'package:gel_rule_app/backend/repositories/provider_repository.dart';
+import 'package:gel_rule_app/backend/repositories/viewed_post_repository.dart';
 import 'package:gel_rule_app/backend/services/collection_service.dart';
 import 'package:gel_rule_app/backend/services/settings_service.dart';
+import 'package:gel_rule_app/backend/services/viewed_history_service.dart';
 import 'package:gel_rule_app/core/cache/cache_service.dart';
 import 'package:gel_rule_app/core/database/app_database.dart';
 import 'package:gel_rule_app/core/database/database_service.dart';
@@ -60,8 +62,9 @@ void main() {
 
     await repository.ensureSeedProviders();
     final result = await repository.getProviders();
+    final providers = (result as Success).data;
 
-    expect((result as Success).data.map((provider) => provider.id), [
+    expect(providers.map((provider) => provider.id), [
       'gelbooru',
       'rule34',
       'safebooru',
@@ -144,6 +147,23 @@ void main() {
 
     expect(cached.data, hasLength(2));
   });
+
+  test('viewed history persists keys and clears history', () async {
+    final service = ViewedHistoryService(
+      ViewedPostRepository(databaseService),
+      postRepository,
+    );
+    final item = post('seen');
+
+    await service.markViewed(item);
+    expect((await service.isViewed(item.id, item.providerId) as Success).data,
+        isTrue);
+    expect((await service.getViewedKeys() as Success).data,
+        contains(item.cacheKey));
+
+    await service.clearHistory();
+    expect((await service.getViewedKeys() as Success).data, isEmpty);
+  });
 }
 
 Post post(String id) => Post(

test/backend/provider_manager_test.dart

@@ -1,6 +1,7 @@
 import 'package:flutter_test/flutter_test.dart';
 import 'package:gel_rule_app/backend/models/content_provider_config.dart';
 import 'package:gel_rule_app/backend/models/post.dart';
+import 'package:gel_rule_app/backend/models/provider_diagnostics.dart';
 import 'package:gel_rule_app/backend/models/provider_health.dart';
 import 'package:gel_rule_app/backend/models/top_period_filter.dart';
 import 'package:gel_rule_app/backend/providers/content_provider.dart';
@@ -12,6 +13,7 @@ import 'package:gel_rule_app/core/utils/result.dart';
 class FakeProviderRepository implements ProviderRepository {
   final configs = <String, ContentProviderConfig>{};
   final health = <String, ProviderHealth>{};
+  final diagnostics = <String, ProviderDiagnostics>{};
 
   @override
   Future<Result<void>> ensureSeedProviders() async => const Success(null);
@@ -55,6 +57,12 @@ class FakeProviderRepository implements ProviderRepository {
     return Success(health[providerId]);
   }
 
+  @override
+  Future<Result<void>> saveDiagnostics(ProviderDiagnostics value) async {
+    diagnostics[value.providerId] = value;
+    return const Success(null);
+  }
+
   @override
   dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }
@@ -179,6 +187,8 @@ void main() {
         as Success<List<Post>>;
     expect(result.data.map((item) => item.providerId), ['a', 'b']);
     expect(repository.health['c']?.status, ProviderStatus.offline);
+    expect(repository.diagnostics['a']?.lastResultCount, 1);
+    expect(repository.diagnostics['c']?.lastErrorMessage, 'Search failed');
   });
 
   test('enable disable provider persists config', () async {

test/backend/smart_blacklist_test.dart

@@ -0,0 +1,70 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:gel_rule_app/backend/backend.dart';
+
+void main() {
+  test('matches simple tag and multi tag AND rules', () {
+    final item = post(tags: ['blue_hair', 'smile']);
+
+    expect(SmartBlacklistMatcher.matches(item, 'blue_hair'), isTrue);
+    expect(SmartBlacklistMatcher.matches(item, 'blue_hair smile'), isTrue);
+    expect(SmartBlacklistMatcher.matches(item, 'blue_hair red_eyes'), isFalse);
+  });
+
+  test('matches provider rating type score and tag groups', () {
+    final item = post(
+      providerId: 'e621',
+      rating: 'explicit',
+      fileType: 'video',
+      score: 42,
+      tagGroups: const {
+        'artist': ['artist_name'],
+        'character': ['char_name'],
+      },
+    );
+
+    expect(SmartBlacklistMatcher.matches(item, 'provider:e621'), isTrue);
+    expect(SmartBlacklistMatcher.matches(item, 'rating:explicit'), isTrue);
+    expect(SmartBlacklistMatcher.matches(item, 'type:video'), isTrue);
+    expect(SmartBlacklistMatcher.matches(item, 'score:>40'), isTrue);
+    expect(SmartBlacklistMatcher.matches(item, 'artist:artist_name'), isTrue);
+    expect(SmartBlacklistMatcher.matches(item, 'character:other'), isFalse);
+  });
+
+  test('similar tags prefer grouped identity tags', () {
+    final item = post(
+      tags: ['general_a', 'general_b'],
+      tagGroups: const {
+        'artist': ['artist_name'],
+        'copyright': ['series_name'],
+      },
+    );
+
+    expect(similarTagsFor(item), ['artist_name', 'series_name']);
+  });
+}
+
+Post post({
+  String providerId = 'gelbooru',
+  String rating = 'safe',
+  String fileType = 'image',
+  int score = 0,
+  List<String> tags = const [],
+  Map<String, List<String>> tagGroups = const {},
+}) {
+  return Post(
+    id: '1',
+    providerId: providerId,
+    providerName: providerId,
+    previewUrl: '',
+    sampleUrl: '',
+    fileUrl: '',
+    tags: tags,
+    tagGroups: tagGroups,
+    rating: rating,
+    width: 0,
+    height: 0,
+    createdAt: DateTime.fromMillisecondsSinceEpoch(0),
+    fileType: fileType,
+    score: score,
+  );
+}

test/shared/tag_input_search_bar_test.dart

@@ -0,0 +1,105 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:gel_rule_app/backend/backend.dart';
+import 'package:gel_rule_app/shared/widgets/app_search_bar.dart';
+
+void main() {
+  testWidgets('commits typed tag with space', (tester) async {
+    String? changed;
+    await tester.pumpWidget(_Harness(
+      child: TagInputSearchBar(
+          onSubmitted: (_) {},
+          onChanged: (value) {
+            changed = value;
+          }),
+    ));
+
+    await tester.enterText(find.byType(TextField), 'touhou ');
+    await tester.pump();
+    await tester.pump();
+
+    expect(find.text('touhou'), findsOneWidget);
+    expect(changed, 'touhou');
+  });
+
+  testWidgets('submits committed tags on search action', (tester) async {
+    String? submitted;
+    await tester.pumpWidget(_Harness(
+      child: TagInputSearchBar(onSubmitted: (value) {
+        submitted = value;
+      }),
+    ));
+
+    await tester.enterText(find.byType(TextField), 'touhou ');
+    await tester.pump();
+    await tester.pump();
+    await tester.testTextInput.receiveAction(TextInputAction.search);
+    await tester.pump();
+
+    expect(submitted, 'touhou');
+  });
+
+  testWidgets('deleting chip updates query', (tester) async {
+    String? changed;
+    await tester.pumpWidget(_Harness(
+      child: TagInputSearchBar(
+        initialValue: 'touhou video',
+        onSubmitted: (_) {},
+        onChanged: (value) {
+          changed = value;
+        },
+      ),
+    ));
+
+    await tester.tap(find.byIcon(Icons.close_rounded).first);
+    await tester.pump();
+
+    expect(changed, 'video');
+  });
+
+  testWidgets('suggestion appends active tag as a chip', (tester) async {
+    String? applied;
+    await tester.pumpWidget(_Harness(
+      child: TagInputSearchBar(
+        suggestions: const [
+          TagSuggestion(
+            name: 'touhou',
+            category: TagCategory.copyright,
+            postCount: 1200,
+            providerId: 'danbooru',
+          ),
+        ],
+        onSubmitted: (_) {},
+        onSuggestionApplied: (value) {
+          applied = value;
+        },
+      ),
+    ));
+
+    await tester.enterText(find.byType(TextField), 'tou');
+    await tester.pump();
+    await tester.tap(find.text('touhou'));
+    await tester.pump();
+
+    expect(find.text('touhou'), findsWidgets);
+    expect(applied, 'touhou');
+  });
+}
+
+class _Harness extends StatelessWidget {
+  const _Harness({required this.child});
+
+  final Widget child;
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Scaffold(
+        body: Padding(
+          padding: const EdgeInsets.all(16),
+          child: child,
+        ),
+      ),
+    );
+  }
+}

windows/CMakeLists.txt

@@ -31,6 +31,7 @@ set(CMAKE_CXX_FLAGS_PROFILE "${CMAKE_CXX_FLAGS_RELEASE}")
 
 # Use Unicode for all projects.
 add_definitions(-DUNICODE -D_UNICODE)
+add_definitions(-D_SILENCE_EXPERIMENTAL_COROUTINE_DEPRECATION_WARNINGS)
 
 # Compilation settings that should be applied to most targets.
 #

windows/flutter/generated_plugin_registrant.cc

@@ -13,6 +13,7 @@
 #include <media_kit_video/media_kit_video_plugin_c_api.h>
 #include <url_launcher_windows/url_launcher_windows.h>
 #include <volume_controller/volume_controller_plugin_c_api.h>
+#include <webview_windows/webview_windows_plugin.h>
 
 void RegisterPlugins(flutter::PluginRegistry* registry) {
   ConnectivityPlusWindowsPluginRegisterWithRegistrar(
@@ -29,4 +30,6 @@ void RegisterPlugins(flutter::PluginRegistry* registry) {
       registry->GetRegistrarForPlugin("UrlLauncherWindows"));
   VolumeControllerPluginCApiRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("VolumeControllerPluginCApi"));
+  WebviewWindowsPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("WebviewWindowsPlugin"));
 }

windows/flutter/generated_plugins.cmake

@@ -10,6 +10,7 @@ list(APPEND FLUTTER_PLUGIN_LIST
   media_kit_video
   url_launcher_windows
   volume_controller
+  webview_windows
 )
 
 list(APPEND FLUTTER_FFI_PLUGIN_LIST