feat: add player settings page and enhance settings UI (#33)

lib/settings/view/buttons.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+
+class OkButton<T> extends StatelessWidget {
+  const OkButton({
+    super.key,
+    this.onPressed,
+  });
+
+  final void Function()? onPressed;
+
+  @override
+  Widget build(BuildContext context) {
+    return TextButton(
+      onPressed: onPressed,
+      child: const Text('OK'),
+    );
+  }
+}
+
+class CancelButton extends StatelessWidget {
+  const CancelButton({
+    super.key,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return TextButton(
+      onPressed: () {
+        Navigator.of(context).pop();
+      },
+      child: const Text('Cancel'),
+    );
+  }
+}