Limit text view line width

Ideally text lines should not be wider than about 70-100 characters. It'd be nice to do something similar to Apostrophe, and limit the maximum width independently of the window size.

<img width="959" height="705" alt="Image" src="https://github.com/user-attachments/assets/051ef457-95b5-4b5c-9164-a48d9022f381" />