Typst (.typ) files should fall back to text file icons

### What Happened?

In the list view, Typst files (.typ) are recognized as Objective-C files sometimes, rather than always falling back to a generic text file

### Steps to Reproduce

1. Open a directory containing a `.typ` file
2. Open list view, or look at the properties of any `.typ` file

### Expected Behavior

I would expect the file browser to either fall back to recognizing a file as a generic text file if it doesn't know what the extension is. Alternatively, add Typst source file as a recognized file type

### OS Version

7.x (Horus)

### Session Type

Classic Session (X11, This is the default)

### Software Version

Latest release (I have run all updates)

### Log Output

_No response_

### Hardware Info

_No response_