feat(server,web): hide faces (#3262)

* feat: hide faces

* fix: types

* pr feedback

* fix: svelte checks

* feat: new server endpoint

* refactor: rename person count dto

* fix(server): linter

* fix: remove duplicate button

* docs: add comments

* pr feedback

* fix: get unhidden faces

* fix: do not use PersonCountResponseDto

* fix: transition

* pr feedback

* pr feedback

* fix: remove unused check

* add server tests

* rename persons to people

* feat: add exit button

* pr feedback

* add server tests

* pr feedback

* pr feedback

* fix: show & hide faces

* simplify

* fix: close button

* pr feeback

* pr feeback

---------

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

mobile/openapi/test/people_response_dto_test.dart

@@ -0,0 +1,37 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+import 'package:openapi/api.dart';
+import 'package:test/test.dart';
+
+// tests for PeopleResponseDto
+void main() {
+  // final instance = PeopleResponseDto();
+
+  group('test PeopleResponseDto', () {
+    // num total
+    test('to test the property `total`', () async {
+      // TODO
+    });
+
+    // num visible
+    test('to test the property `visible`', () async {
+      // TODO
+    });
+
+    // List<PersonResponseDto> people (default value: const [])
+    test('to test the property `people`', () async {
+      // TODO
+    });
+
+
+  });
+
+}