Website UI: Update Header Spacing (Global)

**Background/Context**
Update Header Spacing with New Figma with corrected header spacing: [[Figma — Website Deliverables](https://www.figma.com/design/5j0fQssrV9ipoU16P7hfKy/Website-Deliverables?node-id=1245-5015&t=giOwyVXInXuGJgqt-4)](https://www.figma.com/design/5j0fQssrV9ipoU16P7hfKy/Website-Deliverables?node-id=1245-5015&t=giOwyVXInXuGJgqt-4).

**Scope**
- Update header spacing (font spacing, padding/margins) across the site to match the approved Figma
- Verify consistency across browsers (Chrome, Firefox, Safari, Edge) and OS (macOS, Windows)

**Acceptance Criteria**
- [ ] Header spacing matches approved Figma pixel-for-pixel (or within agreed tolerance)
- [ ] Verified consistent on macOS and Windows across supported browsers
- [ ] No regressions to header responsiveness or no-JS behavior
- [ ] Uses Boostlook.css tokens — no hardcoded spacing values

**Out of Scope**
- Any content or functional changes to header nav items

**Design Reference**
- [[Figma — approved header spacing](https://www.figma.com/design/5j0fQssrV9ipoU16P7hfKy/Website-Deliverables?node-id=1245-5015&t=giOwyVXInXuGJgqt-4)](https://www.figma.com/design/5j0fQssrV9ipoU16P7hfKy/Website-Deliverables?node-id=1245-5015&t=giOwyVXInXuGJgqt-4)

Start by locating the global header styles and the Boostlook.css spacing tokens, then compare the current layout with the approved Figma reference. Verify the header across the listed browsers and macOS and Windows, including responsiveness and no-JS behavior; done means spacing matches the reference without hardcoded spacing values or regressions.

Written by the indexing model from the issue text.