fix: Use clean page titles for JSON-LD headlines

[mvvmm]

Summary

Use the clean page title for the JSON-LD headline instead of the browser <title> with its product/site suffix. The visible <title> and SEO title behavior are unchanged.

Continues #33509 — its two commits are cherry-picked with credit to @pranavsekhar — and addresses the review finding there. head: title overrides use inconsistent separators (|, ·, —) that also occur inside real page titles in both orders (Get started - CLI, Workers RPC — Reserved Methods), so parsing the override is not reliable. The headline is now the frontmatter title — the same value the page renders as its visible <h1> — keeping structured data consistent with on-page content.

For /workers/get-started/guide/:

"headline": "Get started - CLI · Cloudflare Workers docs"

becomes:

"headline": "CLI"

The same derivation removes section/product suffixes from <title> overrides elsewhere, e.g. Performance · Use cases → Performance on the use-cases landing pages and Plans — Cloudflare for SaaS → Plans. Pages whose <title> override was richer than the H1 now get the bare frontmatter title; improving those headlines is a frontmatter-content fix, not a parsing concern.

Tests

• pnpm exec vitest run src/util/page-head.node.test.ts
• pnpm run check
• pnpm run lint
• pnpm run format:core:check
• pnpm run test

Documentation checklist

• The change adheres to the documentation style guide.

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[cloudflare-docs-bot]

Review

✅ No issues found in commit d4f7e21.

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[mvvmm]

closes #33509