refactor: reduce timeline rebuilds (#19704)

* reduce timeline rebuilds

* feat: adds bottom sheet map and actions (#19692)

* adds bottom sheet map and actions

* PR feedbacks

* only reload the asset viewer if asset is changed

* styling tweak

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Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
Co-authored-by: Alex <alex.tran1502@gmail.com>

* rename singleton and remove event prefix

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/domain/services/timeline.service.dart

@@ -7,6 +7,7 @@ import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
 import 'package:immich_mobile/domain/models/setting.model.dart';
 import 'package:immich_mobile/domain/models/timeline.model.dart';
 import 'package:immich_mobile/domain/services/setting.service.dart';
+import 'package:immich_mobile/domain/utils/event_stream.dart';
 import 'package:immich_mobile/infrastructure/repositories/timeline.repository.dart';
 import 'package:immich_mobile/utils/async_mutex.dart';
 
@@ -68,7 +69,7 @@ class TimelineService {
     _bucketSubscription = _bucketSource().listen((buckets) {
       _totalAssets =
           buckets.fold<int>(0, (acc, bucket) => acc + bucket.assetCount);
-      unawaited(reloadBucket());
+      unawaited(_reloadBucket());
     });
   }
 
@@ -79,8 +80,9 @@ class TimelineService {
 
   Stream<List<Bucket>> Function() get watchBuckets => _bucketSource;
 
-  Future<void> reloadBucket() => _mutex.run(() async {
+  Future<void> _reloadBucket() => _mutex.run(() async {
         _buffer = await _assetSource(_bufferOffset, _buffer.length);
+        EventStream.shared.emit(const TimelineReloadEvent());
       });
 
   Future<List<BaseAsset>> loadAssets(int index, int count) =>