fix(mobile): search results

mobile/lib/presentation/pages/search/paginated_search.provider.dart

@@ -1,6 +1,11 @@
+import 'dart:async';
+
 import 'package:hooks_riverpod/hooks_riverpod.dart';
+import 'package:immich_mobile/constants/constants.dart';
 import 'package:immich_mobile/domain/models/search_result.model.dart';
+import 'package:immich_mobile/domain/models/timeline.model.dart';
 import 'package:immich_mobile/domain/services/search.service.dart';
+import 'package:immich_mobile/domain/services/timeline.service.dart';
 import 'package:immich_mobile/models/search/search_filter.model.dart';
 import 'package:immich_mobile/providers/infrastructure/search.provider.dart';
 
@@ -58,3 +63,49 @@ class PaginatedSearchNotifier extends StateNotifier<SearchResult> {
     state = const SearchResult(assets: [], nextPage: 1, scrollOffset: 0.0);
   }
 }
+
+/// A [TimelineService] for search results that stays alive across pagination.
+/// Instead of recreating the service on each page load, it uses a long-lived
+/// bucket stream that emits new buckets whenever the search assets change.
+final paginatedSearchTimelineProvider = Provider.autoDispose<TimelineService>((ref) {
+  final controller = StreamController<List<Bucket>>.broadcast();
+
+  List<Bucket> generateBuckets(int count) {
+    if (count == 0) return [];
+    final buckets = List.filled(
+      (count / kTimelineNoneSegmentSize).ceil(),
+      const Bucket(assetCount: kTimelineNoneSegmentSize),
+    );
+    if (count % kTimelineNoneSegmentSize != 0) {
+      buckets[buckets.length - 1] = Bucket(assetCount: count % kTimelineNoneSegmentSize);
+    }
+    return buckets;
+  }
+
+  // Emit new buckets whenever asset count changes
+  ref.listen(paginatedSearchProvider.select((s) => s.assets.length), (_, count) {
+    controller.add(generateBuckets(count));
+  });
+
+  // Each subscriber gets the current bucket state then follows updates
+  Stream<List<Bucket>> bucketSource() async* {
+    yield generateBuckets(ref.read(paginatedSearchProvider).assets.length);
+    yield* controller.stream;
+  }
+
+  final service = TimelineService((
+    bucketSource: bucketSource,
+    assetSource: (offset, count) {
+      final assets = ref.read(paginatedSearchProvider).assets;
+      return Future.value(assets.skip(offset).take(count).toList(growable: false));
+    },
+    origin: TimelineOrigin.search,
+  ));
+
+  ref.onDispose(() {
+    controller.close();
+    service.dispose();
+  });
+
+  return service;
+});