refactor(ui): Delete SPBrandButton

lib/ui/components/buttons/buttons.dart

@@ -1,2 +0,0 @@
-export 'brand_button.dart';
-export 'sp_brand_button.dart';

lib/ui/components/buttons/sp_brand_button.dart

@@ -1,28 +0,0 @@
-import 'package:flutter/material.dart';
-
-class SPBrandButton extends StatelessWidget {
-  const SPBrandButton({
-    required this.child,
-    required this.onPressed,
-    super.key,
-  });
-
-  SPBrandButton.text({
-    required final String title,
-    required this.onPressed,
-    super.key,
-  }) : child = Text(title);
-
-  final Widget child;
-  final VoidCallback onPressed;
-
-  @override
-  Widget build(final BuildContext context) => FilledButton(
-        // TODO(misterfourtytwo): move button styles to theme configuration
-        style: const ButtonStyle(
-          minimumSize: WidgetStatePropertyAll(Size.fromHeight(48)),
-        ),
-        onPressed: onPressed,
-        child: child,
-      );
-}

lib/ui/pages/onboarding/views/onboarding_view.dart

@@ -1,6 +1,6 @@
 import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
-import 'package:selfprivacy/ui/components/buttons/buttons.dart';
+import 'package:selfprivacy/ui/components/buttons/brand_button.dart';
 
 // base widget for onboarding view
 class OnboardingView extends StatelessWidget {
@@ -41,8 +41,8 @@ class OnboardingView extends StatelessWidget {
                   Padding(
                     padding: const EdgeInsets.symmetric(horizontal: 15) +
                         const EdgeInsets.only(bottom: 30),
-                    child: SPBrandButton.text(
+                    child: BrandButton.filled(
-                      title: buttonTitle.tr(),
+                      text: buttonTitle.tr(),
                       onPressed: onProceed,
                     ),
                   ),