feat: expanded sliver app bar (#19827)

* use mutex

* feat: cool app bar

* animation

* adapt to more pages

* animation

* better animation

* fix: asset count

* Revert "fix: asset count"

This reverts commit 673a5b264b.

* fix: asset count

* fix: shaky animation on Android

* tunning

* offset SizedBox to fix scroll jump on multiselect

---------

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

mobile/lib/widgets/common/immich_sliver_app_bar.dart

@@ -73,7 +73,10 @@ class ImmichSliverAppBar extends ConsumerWidget {
             onPressed: () => context.pop(),
           ),
           IconButton(
-            onPressed: () => ref.read(backgroundSyncProvider).syncRemote(),
+            onPressed: () {
+              ref.read(backgroundSyncProvider).syncLocal(full: true);
+              ref.read(backgroundSyncProvider).syncRemote();
+            },
             icon: const Icon(
               Icons.sync,
             ),