My extension now shows 'Select Theme' on the settings page, but it displays a string instead. It won't show even after I select from the dropdown and refresh. I am currently trying to write code for Flarum 1.7.x, but it's still not working. My test forum version is Flarum 1.8.10. I hope someone can help me solve this. The last few days of developing the extension have been particularly exhausting, from type errors to incorrect PHP syntax. During the development period, I referred to the official documentation more than 30 times. Really, I beg everyone for help, thank you.
https://beta.22web.org/flarum.zip