- Merge navbar-mobile-fix.css into navbar.css (single source)
- Remove navbar-mobile-fix.css references from all HTML pages
- Update navbar.css version for cache busting (v1768447584)
- Add security meta headers to all main pages:
* X-Content-Type-Options: nosniff
* X-Frame-Options: SAMEORIGIN
* X-XSS-Protection: 1; mode=block
* Referrer-Policy: strict-origin-when-cross-origin
- Archive navbar-mobile-fix.css (merged into navbar.css)
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