feat: add open graph and twitter meta tags for anvil-cmg (#4797)

[frano-m]

Summary

• Add OgMeta rendering Open Graph + Twitter meta tags for rich link sharing; wired into _app.tsx so every page picks them up.
• OG image is a 512×512 square AnVIL brand icon on white background; twitter:card="summary" for the small icon-centred preview format (matches brc-analytics + ncpi-dataset-catalog).
• Static MDX pages source pageTitle / pageDescription from frontmatter in each app/content/anvil-cmg/*.mdx (also lungmap/{apis,metadata}.mdx); helper reads them via gray-matter. Replaces the centralised CONTENT_PAGE_META constants module.
• Site-level OG description is now a required field on the local SiteConfig; each consumer (anvil-cmg, hca-dcp, lungmap, anvil-catalog) provides its own copy. DEFAULT_DESCRIPTION constant deleted.
• Entity detail/tab page title is derived in pages/[entityListType]/[...params].tsx from entityConfig.getTitle(props.data) + active detail tab label (falls back to entity id when no title is available). Generic description works for any consumer's entity vocabulary.

Closes #4797.

Test plan

• npm run check-format, npm run lint, npx tsc --noEmit pass
• npm run build:anvil-cmg succeeds; rendered HTML shows og:description, og:title, og:image:width/height=512, twitter:card=summary on both static (e.g. /privacy) and entity-list (e.g. /datasets) pages
• Spot-check entity detail and tab pages after build — og:title should be <entity title> (detail) or <tab label> — <entity title> (tab)
• Smoke-build hca-dcp / lungmap / anvil-catalog to confirm the required description field is wired
• Verify rendered preview in Slack, Twitter/X, LinkedIn, Facebook debugger after deploy

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds Open Graph and Twitter meta tags across the Data Explorer Next.js app to improve rich link previews, and standardizes how page titles/descriptions are sourced for static content and entity pages.

Changes:

• Introduces OgMeta and renders it from _app.tsx using site-level config defaults plus per-page pageTitle/pageDescription.
• Moves static content page metadata to MDX frontmatter (read via gray-matter) and updates various pages to stop passing hard-coded titles to getContentStaticProps.
• Makes site-level description required in SiteConfig and wires it into multiple site configs; adds build steps to copy OG images into public/og/.

Reviewed changes

Copilot reviewed 47 out of 49 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
site-config/lungmap/dev/config.ts	Adds required site-level description for LungMAP dev config.
site-config/hca-dcp/dev/config.ts	Adds required site-level description for HCA DCP dev config.
site-config/common/entities.ts	Extends SiteConfig to require description.
site-config/anvil-cmg/dev/config.ts	Adds required site-level description for AnVIL CMG dev config.
site-config/anvil-catalog/dev/config.ts	Adds required site-level description for AnVIL Catalog dev config.
scripts/common-build.sh	Copies OG images (if present) into public/og/ during common builds.
scripts/build.sh	Copies OG images (if present) into public/og/ during build.
pages/terms-of-service/index.tsx	Uses MDX frontmatter for title/description (stops passing title to helper).
pages/privacy/index.tsx	Uses MDX frontmatter for title/description (stops passing title to helper).
pages/metadata/index.tsx	Uses MDX frontmatter for title/description (stops passing title to helper).
pages/login/index.tsx	Adds pageDescription for OG/meta description.
pages/guides/tsv-file-manifest-download.tsx	Uses MDX frontmatter for title/description.
pages/guides/individual-file-download.tsx	Uses MDX frontmatter for title/description.
pages/guides/index.tsx	Uses MDX frontmatter for title/description.
pages/guides/data-download-via-curl.tsx	Uses MDX frontmatter for title/description.
pages/guides/data-download-options.tsx	Uses MDX frontmatter for title/description.
pages/ga-announcement/index.tsx	Uses MDX frontmatter for title/description.
pages/export/index.tsx	Adds pageDescription for OG/meta description.
pages/export/get-curl-command.tsx	Adds pageDescription for OG/meta description.
pages/export/export-to-terra.tsx	Adds pageDescription for OG/meta description.
pages/export/download-manifest.tsx	Adds pageDescription for OG/meta description.
pages/export/cavatica.tsx	Adds pageDescription for OG/meta description.
pages/export/cancer-genomics-cloud.tsx	Adds pageDescription for OG/meta description.
pages/export/biodata-catalyst.tsx	Adds pageDescription for OG/meta description.
pages/data-dictionary/[dictionary]/index.tsx	Adds static pageTitle/pageDescription for dictionary pages.
pages/beta-announcement/index.tsx	Uses MDX frontmatter for title/description.
pages/apis/index.tsx	Uses MDX frontmatter for title/description.
pages/[entityListType]/index.tsx	Derives list page title/description from entity config label.
pages/[entityListType]/[...params].tsx	Builds entity detail/tab page title from entity title + tab label.
pages/_app.tsx	Wires OgMeta into app and reads config description as default description.
app/content/lungmap/metadata.mdx	Adds pageTitle frontmatter.
app/content/lungmap/apis.mdx	Adds pageTitle frontmatter.
app/content/common/entities.ts	Adds frontmatter typing and allows pageDescription in content props.
app/content/common/contentPages.ts	Reads pageTitle/pageDescription from MDX frontmatter via gray-matter.
app/content/anvil-cmg/terms-of-service.mdx	Adds pageTitle/pageDescription frontmatter.
app/content/anvil-cmg/privacy.mdx	Adds pageTitle/pageDescription frontmatter.
app/content/anvil-cmg/guides/tsv-file-manifest-download.mdx	Adds pageTitle/pageDescription frontmatter.
app/content/anvil-cmg/guides/individual-file-download.mdx	Adds pageTitle/pageDescription frontmatter.
app/content/anvil-cmg/guides/data-download-via-curl.mdx	Adds pageTitle/pageDescription frontmatter.
app/content/anvil-cmg/guides/data-download-options.mdx	Adds pageTitle/pageDescription frontmatter.
app/content/anvil-cmg/guides.mdx	Adds pageTitle/pageDescription frontmatter.
app/content/anvil-cmg/ga-announcement.mdx	Adds pageTitle/pageDescription frontmatter.
app/content/anvil-cmg/beta-announcement.mdx	Adds pageTitle/pageDescription frontmatter.
app/config/config.ts	Switches to local extended SiteConfig type including description.
app/components/Layout/components/BackPage/components/BackPageHero/components/BackPageHeroActions/backPageHeroActions.tsx	Updates config typing/cast to account for extended SiteConfig.
app/components/common/OgMeta/types.ts	Defines OgMeta prop types.
app/components/common/OgMeta/ogMeta.tsx	Implements OG/Twitter/meta description tags using router and config.
.gitignore	Ignores generated public/og/* assets.

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