Part of https://github.com/zed-industries/zed/issues/7992
Takes
https://github.com/zed-industries/zed/issues/7992#issuecomment-3083871615
and applies its adjusted version on the current state of things

Screenshots (left is main, right is the patch): 

* default font size

<img width="3840" height="2160" alt="image"
src="https://github.com/user-attachments/assets/26fdc42c-12e6-447f-ad3d-74808e4b2562"
/>

<img width="3840" height="2160" alt="image"
src="https://github.com/user-attachments/assets/29829c61-c998-4e77-97c3-0e66e14b236d"
/>


* buffer and ui font size 7 

<img width="3840" height="2160" alt="image"
src="https://github.com/user-attachments/assets/5d0f1d94-b7ed-488d-ab22-c25eb01e6b4a"
/>

<img width="3840" height="2160" alt="image"
src="https://github.com/user-attachments/assets/7020d62e-de65-4b86-a64b-d3eea798c217"
/>


Release Notes:

- Added missing linear to sRGB transform in mono sprite rendering on
Linux

Co-authored-by: Thomas Dagenais <exrok@i64.dev>
Co-authored-by: Kate <work@localcc.cc>