gpui: Rewrite Windows `PlatformTextSystem` for better performance (#48087)

The current setup is quite a mess, allocates a ton of unnecessary heap
data when rendering text or querying font info and not really caching
things well, this PR changes that.

Release Notes:

- N/A *or* Added/Fixed/Improved ...
fb428b5a50Lukas Wirth committed on 2/1/2026, 12:32:22 PM· committed by GitHubparent2570382
3 files changedLine totals unavailable