fix(seo): fall back to the localised default description

[TheMeinerLP]

Problem

usePageSeo fell back to the static English site.description before the localised seo.default_description key. A German page without its own description would get English <title>/meta/og text. All pages pass a description today, so this is latent.

The same English value also reaches the WebSite JSON-LD (nuxt-schema-org reads siteConfig.description) and the og defaults, so those stayed English on every locale.

The Organization schema description lives in nuxt.config.ts schemaOrg.identity as one static node. nuxt-schema-org has no per-locale identity, so it is not localised here.

Change

• usePageSeo: description order is now opts.description, then t('seo.default_description'), then site.description as last resort.
• i18n/locales/{de,en}.json: add nuxtSiteConfig.description. nuxt-site-config reads this key per locale (i18n.te check), so useSiteConfig().description, WebSite and og defaults follow the locale.
• nuxt.config.ts: comment naming the key, so the unused-keys spec sees it referenced.

Tests

tests/seo/default-description.spec.ts (Nuxt environment, written before the fix):

• a German page with no description, while the static site description is overridden to English, gets the German default (red before the fix);
• a German page with no description gets the German default (guard);
• nuxtSiteConfig.description in de.json is the German default (red before the fix).

Verification

• pnpm test: 165 files, 1294 tests passed
• pnpm quality: ESLint errors 186, TypeScript errors 3, equal to baseline
• pnpm build: passes

https://claude.ai/code/session_019zws4ceJu2jctk3XT48fMX

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	launchpad	2d3c199	Commit Preview URL Branch Preview URL	Oct 10 2026, 10:21 PM