Spell checking is always enabled despite the option

Nobody has claimed this yet.

### Search first

- [x] I searched and no similar issues were found

### What Happened?

I write in Finnish, so obviously the spell checker will find fault in everything I write. The trouble is that it is disabled. I find the red lines under every new word I write distracting.

### Reproduce the Bug

1. Disable spell checking in the options.
2. Write in any language apart from English.
3. There it is. The words still get marked, even though spell checking is off.

### Expected Behavior

I would expect no spell checking if spell checking is off.

### Screenshots

### Desktop or Mobile Platform Information

Windows 11 desktop app, 0.10.13.

### Additional Context

_No response_

### Are you willing to submit a PR? If you know how to fix the bug.

- [ ] I'm willing to submit a PR (Thank you!)

Start at the spell-checking option and its Windows desktop integration, then reproduce the three steps on the reported 0.10.13 setup. Trace how the disabled setting reaches the editor for non-English text; done means disabling spell checking removes all red underlines while enabled behavior remains intact.

Written by the indexing model from the issue text.