fix: resolve remaining Astro check hints

[mvvmm]

Summary

Resolves the last 5 astro check hints — now 0 errors, 0 warnings, 0 hints.

Changes

• src/components/OneTrust.astro — Assign OptanonWrapper to window instead of declaring a local unused function. OneTrust requires it as a global callback; the assignment eliminates the TS6133 "declared but never read" hint.
• src/components/PageHead.astro — Add is:inline to the JSON-LD <script> tag using set:html. Astro warns when set:html is used without is:inline because it cannot process the content at build time.
• src/components/cf/CURL.astro — Replace deprecated z.string().url() with z.url() (Zod v4 API).
• src/util/custom-loaders.ts — Replace deprecated z.string().url() with z.url() (Zod v4 API).
• src/components/ui/search/Search.astro — Replace deprecated navigator.platform with navigator.userAgent for Apple device detection. The regex /Mac|iPhone|iPad|iPod/ matches the same substrings in userAgent.

Validation

pnpm run check              # 0 errors, 0 warnings, 0 hints
pnpm run lint               # clean
pnpm run format:core:check  # clean
pnpm run test               # 108 passed (10 files)

Checklist

• No behavior changes intended
• All checks pass
• No new dependencies

[github-actions]

This pull request requires reviews from CODEOWNERS as it changes files that match the following patterns:

Pattern	Owners
*.astro	@cloudflare/content-engineering, @kodster28
/src/components/ui/search/	@cloudflare/content-engineering, @cloudflare/ai-search
*.ts	@cloudflare/content-engineering, @kodster28

[cloudflare-docs-bot]

Review

✅ No issues found in commit 029029e.

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[github-actions]

Preview URL: https://029029e9.preview.developers.cloudflare.com
Preview Branch URL: https://fix-astro-check-hints.preview.developers.cloudflare.com