Fix residual blog metadata from Ahrefs audit

[lawrencecchen]

Stacked on #7888.

Selects complete, route-specific metadata for 11 blog families, /nightly, and /guides across published locales. HTML, Open Graph, Twitter, and article schema use the same selected copy. English-only cmux-omo and gpl URLs now canonicalize instead of publishing fallback duplicates.

Tests: bun test (591 passed, 91 skipped), bun run typecheck, changed-file ESLint.

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Note

Low Risk
Marketing-site SEO, routing, and i18n metadata only; no auth, payments, or app runtime behavior.

Overview
Routes 11 audited blog posts plus /nightly and /guides through shared helpers (blogPostSeoCopy, landingPageSeoCopy) so HTML metadata, Open Graph, Twitter, and article JSON-LD use the same plain-text, route-specific titles and descriptions (title: { absolute: ... } on blog pages).

English-only posts (cmux-claude-teams, cmux-omo, gpl) are registered with englishFallbackContentLocales: middleware 301s prefixed locale URLs to the canonical path, alternates/sitemap/agent lists only emit en, and the blog index/pager filter them out for other locales via blogPostsForLocale.

BlogSchema gains optional seoKey to align JSON-LD with audited copy. Locale fallback routing is generalized per-route (fallbackContentRoutes + per-route locales). Tests and small i18n string tweaks support the audit rules (plain-text candidates, punctuation checks).

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Summary by cubic

Fixes residual blog metadata from the SEO audit. Routes 11 audited posts and /nightly + /guides through plain‑text, canonical SEO; three English‑only posts are canonicalized and hidden from localized lists.

• Bug Fixes
  • Route audited blog pages through blogPostSeoCopy; set title: { absolute: ... } and pass seoKey to BlogSchema so JSON‑LD uses the same audited copy.
  • Use landingPageSeoCopy for /nightly and /guides with complete prose and site context.
  • Treat /blog/cmux-claude-teams, /blog/cmux-omo, and /blog/gpl as English‑only: per‑route locale lists in locale-availability, buildAlternates/Link headers and sitemap emit only en, and middleware picks a preferred available locale and 301s non‑canonical locale paths.
  • Hide English‑only posts from non‑English pages: blog index and pager use blogPostsForLocale; agent‑page lists and sitemap match.
  • Enforce plain‑text metadata (reject rich messages and list lead‑ins); i18n copy tweaks in en, bs, th, tr; expanded tests for audited routes, alternates, discovery, and canonicalization; stabilized navigation mocks.

^{Written for commit e4f99ab. Summary will update on new commits.}

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[greptile-apps]

Greptile Summary

This PR aligns audited blog and landing-page metadata across localized routes. The main changes are:

• Adds shared SEO copy selection for 11 blog families, /nightly, and /guides.
• Uses the selected copy for HTML, Open Graph, Twitter, and article schema metadata.
• Canonicalizes English-only blog routes and limits their localized discovery.
• Filters the blog index and pager by each post's available locales.
• Expands tests for metadata, redirects, alternates, sitemap entries, and agent-readable variants.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
web/i18n/audited-seo.ts	Adds shared, typed metadata selection for audited blog posts and landing pages.
web/i18n/locale-availability.ts	Adds route-specific locale sets for fallback and English-only content.
web/proxy.ts	Uses route-specific locale availability for negotiation, redirects, rewrites, and alternate links.
web/app/[locale]/components/blog-posts.ts	Adds locale-aware blog post filtering for the index and pager.
web/app/sitemap.ts	Limits English-only blog posts to canonical English sitemap entries.
web/app/lib/agent-page-paths.ts	Aligns agent-readable blog variants with route locale availability.

_{Reviews (12): Last reviewed commit: "Hide untranslated Claude Teams blog rout..." | Re-trigger Greptile}

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