docs: add api section with slots to DragPreview

[yihuiliao]

Closes

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

Go to S2 Dnd docs and scroll to bottom under the API section to DragPreview

🧢 Your Project:

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the S2 docs
• View the React Aria docs

[rspbot]

Agent Skills Changes

Modified (1)

• s2/skills/react-spectrum-s2/references/guides/dnd.md $\color{green}{+8}$

Install

React Spectrum S2:

npx skills add https://d1pzu54gtk2aed.cloudfront.net/pr/00fe1bfdc6d4255711ee2fd0e8f73fbae25a632a/

React Aria:

npx skills add https://d5iwopk28bdhl.cloudfront.net/pr/00fe1bfdc6d4255711ee2fd0e8f73fbae25a632a/