fix: timeline service uninitialised across routes (#19544)

mobile/lib/providers/infrastructure/action.provider.dart

@@ -1,20 +1,18 @@
 import 'package:flutter/material.dart';
 import 'package:immich_mobile/constants/enums.dart';
 import 'package:immich_mobile/domain/models/asset/base_asset.model.dart';
-import 'package:immich_mobile/providers/infrastructure/timeline.provider.dart';
-import 'package:immich_mobile/providers/multiselect.provider.dart';
 import 'package:immich_mobile/providers/timeline/multiselect.provider.dart';
 import 'package:immich_mobile/providers/user.provider.dart';
 import 'package:immich_mobile/services/action.service.dart';
+import 'package:immich_mobile/services/timeline.service.dart';
 import 'package:logging/logging.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 
 final actionProvider = NotifierProvider<ActionNotifier, void>(
   ActionNotifier.new,
   dependencies: [
-    actionServiceProvider,
+    multiSelectProvider,
     timelineServiceProvider,
-    multiselectProvider,
   ],
 );
 
@@ -32,7 +30,7 @@ class ActionResult {
 
 class ActionNotifier extends Notifier<void> {
   final Logger _logger = Logger('ActionNotifier');
-  late final ActionService _service;
+  late ActionService _service;
 
   ActionNotifier() : super();
 

mobile/lib/providers/infrastructure/timeline.provider.dart

@@ -15,9 +15,17 @@ final timelineArgsProvider = Provider.autoDispose<TimelineArgs>(
       throw UnimplementedError('Will be overridden through a ProviderScope.'),
 );
 
-final timelineServiceProvider = Provider.autoDispose<TimelineService>(
-  (ref) =>
-      throw UnimplementedError('Will be overridden through a ProviderScope.'),
+final timelineServiceProvider = Provider<TimelineService>(
+  (ref) {
+    final timelineUsers = ref.watch(timelineUsersProvider).valueOrNull ?? [];
+    final timelineService =
+        ref.watch(timelineFactoryProvider).main(timelineUsers);
+    ref.onDispose(timelineService.dispose);
+    return timelineService;
+  },
+  // Empty dependencies to inform the framework that this provider
+  // might be used in a ProviderScope
+  dependencies: [],
 );
 
 final timelineFactoryProvider = Provider<TimelineFactory>(

mobile/lib/providers/timeline/multiselect.provider.dart

@@ -47,12 +47,10 @@ class MultiSelectState {
 }
 
 class MultiSelectNotifier extends Notifier<MultiSelectState> {
-  late final TimelineService _timelineService;
+  TimelineService get _timelineService => ref.read(timelineServiceProvider);
 
   @override
   MultiSelectState build() {
-    _timelineService = ref.read(timelineServiceProvider);
-
     return const MultiSelectState(selectedAssets: {});
   }
 
@@ -145,5 +143,5 @@ final bucketSelectionProvider = Provider.family<bool, List<BaseAsset>>(
     // Check if all assets in the bucket are selected
     return bucketAssets.every((asset) => selectedAssets.contains(asset));
   },
-  dependencies: [multiSelectProvider],
+  dependencies: [multiSelectProvider, timelineServiceProvider],
 );