Add shadcn comparison page

[tin-computer]

What changed

• adds a focused /compare/shadcn-vs-payload-components page that scopes the comparison to a Payload Components layout item
• shows the five-artifact install boundary, an illustrative wiring diff, and one install-copy CTA
• links the homepage wiring section to the comparison
• adds sitemap, canonical, breadcrumb JSON-LD, and LLM-readable coverage
• keeps install-copy attribution separated with source_path: /compare/shadcn-vs-payload-components

Verification

• pnpm lint
• pnpm exec tsc --noEmit
• pnpm build
• focused Playwright coverage for the page, homepage link, sitemap, LLM routes, canonical URL, structured data, and install-copy analytics
• local Lighthouse SEO: 100
• mobile overflow probe at 390px: no page-level horizontal overflow

Comparison boundary

shadcn can distribute any files declared by a registry item. This page compares raw delivery of this project’s hero-basic registry item with the additional Payload-specific wiring completed by payload-components add.

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Project	Deployment	Actions	Updated (UTC)
payload-components	Ready	Preview, Comment	Jul 15, 2026 11:02am
payload-components-97bf	Ready	Preview, Comment	Jul 15, 2026 11:02am

[Ducksss]

Closing because the repository already has the canonical comparison guide at /docs/shadcn-vs-payload-components. This PR creates a competing route with duplicate sitemap/LLM/search intent and also includes an unrelated third-party footer attribution. The useful homepage link can point to the existing guide in a focused change.