fix(theme): add scroll padding top

[10Derozan]

Summary

Prevent in-page jump elements from being blocked by nav.

Related Issue

Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

[netlify]

✅ Deploy Preview for aquamarine-blini-95325f ready!

Name	Link
🔨 Latest commit	a8e02fb
🔍 Latest deploy log	https://app.netlify.com/sites/aquamarine-blini-95325f/deploys/65f2d60c9f207900081db396
😎 Deploy Preview	https://deploy-preview-788--aquamarine-blini-95325f.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 78 (🔴 down 16 from production) Accessibility: 97 (no change from production) Best Practices: 100 (no change from production) SEO: 92 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify site configuration.