fix: brand_header now extends preferred_size_widget

lib/ui/components/brand_header/brand_header.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 
-class BrandHeader extends StatelessWidget {
+class BrandHeader extends StatelessWidget implements PreferredSizeWidget {
   const BrandHeader({
     super.key,
     this.title = '',
@@ -8,6 +8,9 @@ class BrandHeader extends StatelessWidget {
     this.onBackButtonPressed,
   });
 
+  @override
+  Size get preferredSize => const Size.fromHeight(52.0);
+
   final String title;
   final bool hasBackButton;
   final VoidCallback? onBackButtonPressed;

lib/ui/pages/more/more.dart

@@ -21,11 +21,8 @@ class MorePage extends StatelessWidget {
 
     return Scaffold(
       appBar: Breakpoints.small.isActive(context)
-          ? PreferredSize(
-              preferredSize: const Size.fromHeight(52),
-              child: BrandHeader(
-                title: 'basis.more'.tr(),
-              ),
+          ? BrandHeader(
+              title: 'basis.more'.tr(),
             )
           : null,
       body: ListView(

lib/ui/pages/providers/providers.dart

@@ -65,11 +65,8 @@ class _ProvidersPageState extends State<ProvidersPage> {
 
     return Scaffold(
       appBar: Breakpoints.small.isActive(context)
-          ? PreferredSize(
-              preferredSize: const Size.fromHeight(52),
-              child: BrandHeader(
-                title: 'basis.providers_title'.tr(),
-              ),
+          ? BrandHeader(
+              title: 'basis.providers_title'.tr(),
             )
           : null,
       body: ListView(

lib/ui/pages/services/services.dart

@@ -37,11 +37,8 @@ class _ServicesPageState extends State<ServicesPage> {
 
     return Scaffold(
       appBar: Breakpoints.small.isActive(context)
-          ? PreferredSize(
-              preferredSize: const Size.fromHeight(52),
-              child: BrandHeader(
-                title: 'basis.services'.tr(),
-              ),
+          ? BrandHeader(
+              title: 'basis.services'.tr(),
             )
           : null,
       body: !isReady

lib/ui/pages/users/users.dart

@@ -129,11 +129,8 @@ class UsersPage extends StatelessWidget {
 
     return Scaffold(
       appBar: Breakpoints.small.isActive(context)
-          ? PreferredSize(
-              preferredSize: const Size.fromHeight(52),
-              child: BrandHeader(
-                title: 'basis.users'.tr(),
-              ),
+          ? BrandHeader(
+              title: 'basis.users'.tr(),
             )
           : null,
       body: child,