Fix /press/[slug] article body rendering from Sanity

[sean-lai-sh]

Problem

The press detail route is fetching pressPost documents, but the long-form article body is not reliably rendering on /press/[slug]. Right now the feature looks partially wired: title/excerpt chrome exists, but the actual Sanity article text is not production-safe.

Scope

• Reproduce the failure on a real pressPost entry
• Verify the GROQ projection for body[] in technyu2025/lib/sanity/queries.ts
• Verify the runtime shape expected by technyu2025/components/press/portable-text.tsx and technyu2025/components/press/press-article.tsx
• Check published vs draft perspective behavior so seeded CMS content actually resolves on public routes
• Add a regression test or a minimal fixture-level verification path for Portable Text rendering

Acceptance Criteria

• Visiting /press/[slug] renders the body paragraphs from Sanity, not just the hero/title shell
• Inline links/highlights still render correctly
• Inline image blocks render when present
• The route handles missing/empty body content gracefully instead of silently looking broken