Marcel 9e7861fa03 feat(geschichten): frontend foundation — canBlogWrite, sanitize util, nav, i18n
- Derives canBlogWrite in +layout.server.ts the same way as canAnnotate.
- Adds Geschichten link to AppNav (desktop + mobile, between Stammbaum and Admin).
- Adds error_geschichte_not_found mapping to errors.ts and translation keys
  for the Geschichten index, detail, editor, and confirmation copy in
  de/en/es.
- Adds isomorphic-dompurify-backed safeHtml() helper with allow-list
  matching the backend OWASP policy (p/br/strong/em/h2/h3/ul/ol/li),
  plus Vitest spec.
- Updates legacy spec test data so the new required canBlogWrite layout
  prop type-checks.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
2026-05-02 17:43:29 +02:00
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