Meson: rebuild without requiring ninja clean

### What Happened?

The stylesheet doesn't get properly rebuilt if you build with just `ninja` and not `ninja clean`.

### Steps to Reproduce

1. Build with `ninja`
2. Make changes and build again with `ninja`
3. Test and see that changes weren't built

### Expected Behavior

The build system should be set up such that it produces new builds reflecting the latest source code changes when building with `ninja` and not requiring `ninja clean`

### OS Version

7.x (Early Access)

### Software Version

Compiled from git

### Log Output

_No response_

### Hardware Info

_No response_