refactor: yeet old timeline (#27666)

* refactor: yank old timeline

# Conflicts:
#	mobile/lib/presentation/pages/editing/drift_edit.page.dart
#	mobile/lib/providers/websocket.provider.dart
#	mobile/lib/routing/router.dart

* more cleanup

* remove native code

* chore: bump sqlite-data version

* remove old background tasks from BGTaskSchedulerPermittedIdentifiers

* rebase

---------

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

mobile/test/fixtures/user.stub.dart

@@ -12,24 +12,4 @@ abstract final class UserStub {
     profileChangedAt: DateTime(2021),
     avatarColor: AvatarColor.green,
   );
-
-  static final user1 = UserDto(
-    id: "user1",
-    email: "user1@test.com",
-    name: "user1",
-    isAdmin: false,
-    updatedAt: DateTime(2022),
-    profileChangedAt: DateTime(2022),
-    avatarColor: AvatarColor.red,
-  );
-
-  static final user2 = UserDto(
-    id: "user2",
-    email: "user2@test.com",
-    name: "user2",
-    isAdmin: false,
-    updatedAt: DateTime(2023),
-    profileChangedAt: DateTime(2023),
-    avatarColor: AvatarColor.primary,
-  );
 }