fix: Clean up contrast issues on auth errors

[arbroen]

fix: Auth modal now shows errors in dark red. 

- Applied the same styling as the `.errors-wrapper` css class. 
- Removed margin left, margin right, so it aligns nicely with the form fields. 
- Removed margin on close button so it aligns nicely on the right. 
- Added a max() to `max-height` on the modal to prevent it from showing a scroll bar on larger screens. 

PS. I had never used;

• hatch
• uv
• invoke
• conventional commits

I'm sorry if I messed any approach up in advance.