- Add sitemap.ts and robots.ts
- pageMetadata() helper: consistent title, canonical URL, Open Graph,
Twitter card and feed alternate on every page
- Generated OG images: a site card, and per post either the cover image
or a branded title card (pre-rendered at build)
- BlogPosting JSON-LD on post pages
- Fail fast with a clear error when SITE_URL is missing
Content loading:
- Validate post frontmatter at build time and normalize dates to ISO
(fixes invalid <time datetime> values)
- Add draft: true support (drafts only render in development)
- Cache markdown rendering so metadata and page share one render
- Replace the three copy-pasted about/projects/setup pages with a shared
MarkdownPage component
- Slugify tag/category static params so pre-rendered pages match links;
disable dynamic params and return a real 404 via notFound()
- Drop bogus generateStaticParams from the tags/categories index pages
- Add a styled not-found page
- Sort 'Recently updated' by last modification before slicing
- Atom feed: correct rel=self URL, use updated dates, valid content type
- Swap no-js -> js class in an inline head script before first paint
- Markdown links: only route internal paths through next/link and
tolerate missing hrefs
