refactor(server): stacks (#11453)

* refactor: stacks

* mobile: get it built

* chore: feedback

* fix: sync and duplicates

* mobile: remove old stack reference

* chore: add primary asset id

* revert change to asset entity

* mobile: refactor mobile api

* mobile: sync stack info after creating stack

* mobile: update timeline after deleting stack

* server: update asset updatedAt when stack is deleted

* mobile: simplify action

* mobile: rename to match dto property

* fix: web test

---------

Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/lib/pages/common/gallery_viewer.page.dart

@@ -68,7 +68,7 @@ class GalleryViewerPage extends HookConsumerWidget {
     });
 
     final stackIndex = useState(-1);
-    final stack = showStack && currentAsset.stackChildrenCount > 0
+    final stack = showStack && currentAsset.stackCount > 0
         ? ref.watch(assetStackStateProvider(currentAsset))
         : <Asset>[];
     final stackElements = showStack ? [currentAsset, ...stack] : <Asset>[];