fix(landing): graceful not-found handling for blog and library posts and authors

[waleedlatif1]

Summary

• /blog/[slug] and /library/[slug] with an unknown slug now render section-scoped "Post not found" pages with a Browse CTA — the exact pattern integrations/models/comparisons already use (notFound() guard + section-local not-found.tsx) — instead of falling through to the bare root "Page not found"
• getPostBySlug returns null for unknown slugs instead of throwing, removing a latent 500 (the throw was only masked by dynamicParams = false); both pages and generateMetadata now guard
• /blog/authors/[id] and /library/authors/[id] with an unknown author now return a real 404 via notFound() + author-scoped not-found.tsx — previously they returned an indexable HTTP 200 soft-404
• Removed ContentAuthorPage's now-dead inline "Author not found" fallback and made authorName required — both consumers guard before rendering

Type of Change

• Bug fix

Testing

Verified on a dev server: unknown post slugs 404, unknown authors render the author not-found screen, and real posts/authors are unaffected. Dev enforces dynamicParams = false as a root-level 404 (confirmed identical dev behavior for the existing integrations/models routes, which render their section not-found in production per staging), so production behavior matches the established sections. Typecheck and lint pass; all getPostBySlug call sites audited for null-safety.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Jul 14, 2026 1:30am

[cursor]

PR Summary

Low Risk
Landing-only routing and SEO behavior changes with no auth or data handling; pattern matches other landing sections.

Overview
Blog and library post and author routes now return proper 404s with section-specific UI instead of errors or soft 200s.

getPostBySlug returns null for unknown slugs (no throw), and blog/library slug pages call notFound() when missing; generateMetadata returns empty metadata in that case. New not-found.tsx files under /blog, /blog/authors, /library, and /library/authors show “Post/Author not found” with browse CTAs and robots: noindex.

Author routes notFound() when the id has no author (fixing indexable soft-404s). ContentAuthorPage drops its inline not-found branch; authorName is required and callers guard before render.

^{Reviewed by Cursor Bugbot for commit 3c29e20. Configure here.}

[greptile-apps]

Greptile Summary

This PR adds scoped not-found handling for landing content pages. The main changes are:

• Missing blog and library posts now return section-level not-found pages.
• Unknown blog and library authors now call notFound() instead of rendering an inline fallback.
• getPostBySlug now returns null for unknown slugs.
• ContentAuthorPage now requires a resolved author name.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

Important Files Changed

Filename	Overview
apps/sim/lib/content/registry-factory.ts	getPostBySlug now returns null instead of throwing when a slug is missing.
apps/sim/app/(landing)/blog/[slug]/page.tsx	The blog post page now guards missing posts in metadata and render paths.
apps/sim/app/(landing)/library/[slug]/page.tsx	The library post page now guards missing posts in metadata and render paths.
apps/sim/app/(landing)/blog/authors/[id]/page.tsx	The blog author page now returns not-found when the author cannot be resolved.
apps/sim/app/(landing)/library/authors/[id]/page.tsx	The library author page now returns not-found when the author cannot be resolved.
apps/sim/app/(landing)/components/content-author-page/content-author-page.tsx	The shared author page component no longer renders its own missing-author fallback.
apps/sim/app/(landing)/blog/not-found.tsx	Adds a blog-scoped post not-found page.
apps/sim/app/(landing)/library/not-found.tsx	Adds a library-scoped post not-found page.
apps/sim/app/(landing)/blog/authors/not-found.tsx	Adds a blog author not-found page.
apps/sim/app/(landing)/library/authors/not-found.tsx	Adds a library author not-found page.

_{Reviews (1): Last reviewed commit: "fix(landing): graceful not-found handlin..." | Re-trigger Greptile}