### Description I just clone the repo, build the example: 1. The language selection does not work as it always render plaintext no matter the current selection. 2. Trying to modify the source to render with the specific language, it flickering ref https://github.com/CodeEditApp/CodeEditSourceEditor/issues/293 3. Not support dark theme, I build the app and my macOS on dark theme, I barely see the gutter because the label is white. ### To Reproduce 1. Clone the repo. 2. Build the example. 3. Open swift file 4. Change language selection to swift See the text is rendering as plaintext, no colour. ### Expected Behavior Should work as expected. ### Version Information CodeEditSourceEditor: Current main macOS: 15.1.1 Xcode: 16.2 You can see that right after the language was chosen from the dropdown, it rollback to plaintext. <img width="1012" alt="Image" src="https://github.com/user-attachments/assets/27070b1e-4fa4-40c3-be15-2c4bdc045663" /> <img width="510" alt="Image" src="https://github.com/user-attachments/assets/929345ee-68ad-4ae3-ab45-893261512c05" />