SEO: head component, OG card, sitemap, robots, JSON-LD, favicons

The site exists to be linked; previews and indexing are not polish.

• Per-route titles/descriptions via a shared head component; canonical URLs
• One static branded OG card at /og.png wired into og:/twitter: tags
• sitemap.xml (static routes + published content), robots.txt (Disallow /admin), noindex meta on /guestbook and /admin
• JSON-LD Person on / and /cv; SVG favicon + apple-touch-icon + minimal manifest
• E2e: sitemap lists published content only