🐛 ButtonStyle.textStyle is not applied to button's Text child

[jacksonb-cs]

Describe the bug
Giving a ButtonStyle to either Button or FilledButton does not have any effect on descendent Text widgets. It is also not applied if the ButtonStyle is defined in the app's top-level theme data.

I have encountered this behavior on fluent_ui v4.15.1 and v4.13.0

To Reproduce
Here is a minimally-reproduceable code sample.

import 'package:fluent_ui/fluent_ui.dart';

void main() {
  runApp(const MainApp());
}

class MainApp extends StatelessWidget {
  const MainApp({super.key});

  @override
  Widget build(BuildContext context) {
    return FluentApp(
      home: ScaffoldPage(
        content: Center(
          child: FilledButton(
            style: ButtonStyle(
              textStyle: WidgetStatePropertyAll(TextStyle(color: Colors.black)),
            ),
            onPressed: () {},
            child: const Text('Press Me'),
          ),
        ),
      ),
    );
  }
}

In this example, I would expect the button's text to be black, but it stays the default color of white.

Expected behavior
I expect to be able to give my app's top-level theme data a ButtonStyle with a specified ButtonStyle.textStyle that is applied to the buttons' descendent text. This bug prevents me from easily and consistently theming my app's buttons.