gpui_windows: Fix reversed linear/sRGB transfer functions in shader (#57543)

## Summary
- swap the Windows HLSL exponents for `linear_to_srgb` and
`srgb_to_linear`
- align the Windows Oklab gradient path with the existing Metal and WGSL
implementations

## Testing
- not run (shader-only change)

Fixes #57542

Release Notes:

- [GPUI] Fix reversed linear/sRGB transfer functions

Co-authored-by: Chris Biscardi <chris@christopherbiscardi.com>
b9419ae728Minh Vu committed on 9/17/2026, 4:09:12 PM· committed by GitHubparent68ec865
1 file changedLine totals unavailable