118 - Implement shared album feature (#124)

* New features 
  - Share album. Users can now create albums to share with existing people on the network.
  - Owner can delete the album.
  - Owner can invite the additional users to the album.
  - Shared users and the owner can add additional assets to the album.
* In the asset viewer, the user can swipe up to see detailed information and swip down to dismiss.
* Several UI enhancements.

mobile/lib/modules/home/ui/immich_sliver_appbar.dart

@@ -29,7 +29,7 @@ class ImmichSliverAppBar extends ConsumerWidget {
       floating: true,
       pinned: false,
       snap: false,
-      backgroundColor: Colors.grey[200],
+      // backgroundColor: Colors.grey[200],
       shape: const RoundedRectangleBorder(borderRadius: BorderRadius.all(Radius.circular(5))),
       leading: Builder(
         builder: (BuildContext context) {
@@ -40,7 +40,7 @@ class ImmichSliverAppBar extends ConsumerWidget {
                 child: IconButton(
                   splashRadius: 25,
                   icon: const Icon(
-                    Icons.account_circle_rounded,
+                    Icons.face_outlined,
                     size: 30,
                   ),
                   onPressed: () {