feat: add SEO meta, OG image, favicons and sitemap

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- Full meta suite in index.html: description, canonical, robots,
  Open Graph + Twitter cards, theme-color and JSON-LD structured data
- 1200x630 OG share card matching the homepage Plan-B wordmark
- Favicon set generated from the intro storm icon (svg + png + apple
  touch + 192/512 PWA icons) and a web manifest
- robots.txt + sitemap.xml with hreflang alternates
- setLang() now syncs title/description/og tags on EN/DE toggle

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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This commit is contained in:

Dorian

2026-06-16 14:52:58 +01:00

parent ff8331c54d

commit b0b4d41571

13 changed files with 188 additions and 3 deletions

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