docs: fix typo in design-system.css comment (#11231)
Description
This PR fixes a spelling typo in the CSS comment within the design
system stylesheet.
Changes
- Fixed typo: "Seperate" → "Separate" in
`docs/site/app/design-system.css` (line 6)
- The comment explains how HSL values are separated from opacity for
dynamic TailwindCSS usage
Motivation
While reviewing the codebase, I noticed this small typo in the
documentation comment. Fixing it improves code readability and maintains
professional documentation standards.
Type of Change
- [x] Documentation improvement
- [x] Non-breaking change
- [x] Typo correction
Testing
- No functional changes - this is a comment-only modification
- Verified CSS file has no syntax errors
- No impact on build or runtime behavior
Checklist
- [x] The change is focused and atomic
- [x] Commit message follows conventional commits format
- [x] No breaking changes introduced
