fix: hide faces (#3352)

* fix: hide faces

* remove unused variable

* fix: work even if one fails

* better style for hidden people

* add hide face in the menu dropdown

* add buttons to toggle visibility for all faces

* add server test

* close modal with escape key

* fix: explore page

* improve show & hide faces modal

* keep name on people card

* simplify layout

* sticky app bar in show-hide page

* fix format

---------

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

mobile/openapi/test/person_api_test.dart

@@ -42,6 +42,11 @@ void main() {
       // TODO
     });
 
+    //Future<List<BulkIdResponseDto>> updatePeople(PeopleUpdateDto peopleUpdateDto) async
+    test('test updatePeople', () async {
+      // TODO
+    });
+
     //Future<PersonResponseDto> updatePerson(String id, PersonUpdateDto personUpdateDto) async
     test('test updatePerson', () async {
       // TODO