gpui_macos: Handle non-number font smoothing defaults (#56398)

It seems there are cases where this isn't a number somehow (ZED-7N8), so
added a more defensive check

Release Notes:

- N/A
aa16a3bf9dBen Brandt committed on 5/11/2026, 3:31:25 PM· committed by GitHubparent8033fbf
1 file changedLine totals unavailable