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Pamela Chia c26b64a033 feat(www): emit BreadcrumbList JSON-LD on marketing surfaces (#45478)
## Summary

- Adds `breadcrumbListSchema(items)` helper to `apps/www/lib/json-ld.ts`
and a hand-curated `apps/www/lib/breadcrumbs.ts` route map.
- Wires inline `<script type="application/ld+json">` BreadcrumbList
blocks into 18 marketing surfaces: blog (index + slug), customers (index
+ slug), events (index + slug), 5 product pages (database, auth,
storage, edge-functions, realtime), 3 modules (vector, cron, queues),
pricing, careers, company, features.
- Pages router callers wrap the script in `<Head>`; app router callers
place it directly in JSX. Dynamic surfaces append a leaf at render time
using the page's title (`frontmatter.title` for blog, `meta_title ??
title` for customers, `event.meta_title ?? event.title` for events).
- Modules sit at `Home > {Name}` since no `/modules` index page exists;
products sit at `Home > {Product}` (no shared products parent). Absolute
`https://supabase.com` URLs match the existing `CANONICAL_ORIGIN`
convention so anchors stay stable across Vercel previews.

Linear:
[GROWTH-822](https://linear.app/supabase/issue/GROWTH-822/add-breadcrumblist-json-ld-to-www-marketing-surfaces)
(sub-issue under
[GROWTH-724](https://linear.app/supabase/issue/GROWTH-724)).

> **Note on branch name:** the branch is
`pamela/growth-820-www-breadcrumb-jsonld`; the actual Linear issue is
GROWTH-822. The branch was named before the sub-issue was created.
Ignore the `820` in the branch.

Explicitly deferred (separate PRs / low SEO ROI): `/launch-week/*`,
`/solutions/*`, `/partners/*`, `/alternatives/*`, `/changelog`,
`/legal/dpa`, `/aws-reinvent-2025`, `/wrapped`, `/contribute/*`,
`/brand-assets`, `/ga`, `/ga-week`, `/state-of-startups*`, and the
homepage (Organization + WebSite already cover homepage entity signals;
single-item BreadcrumbList is ignored by Google).

## Test plan

- [x] On the Vercel preview, `curl -s https://<preview>/database | grep
'"BreadcrumbList"'` returns the script block with `Home > Database`.
- [x] `curl -s https://<preview>/blog/<recent-slug> | grep
'"BreadcrumbList"'` returns `Home > Blog > {post title}`.
- [x] `curl -s https://<preview>/customers/<slug> | grep
'"BreadcrumbList"'` returns `Home > Customer Stories > {customer
title}`.
- [x] `curl -s https://<preview>/events/<slug> | grep
'"BreadcrumbList"'` returns `Home > Events > {event title}`.
- [x] `curl -s https://<preview>/modules/vector | grep
'"BreadcrumbList"'` returns `Home > Vector`.
2026-05-05 23:57:53 +08:00
..
2026-02-24 10:50:54 +00:00