docs: tighten the SEO tags, name the head term, and add breadcrumbs and crawl links

[simien]

What does this change?

A pass over the guide and the three explainers, checked against the app and against what a search result actually shows.

• Two tags ran long. The seamless page's title was 72 characters (results cut around 60) and the animated page's description was 180 (cut around 155). Both are shortened on every copy: <title>, Open Graph, Twitter, and JSON-LD.
• "Background generator" appeared on none of the explainers. It is the head term in the app's title. Each explainer now calls Flield "a seamless background generator" once, in the sentence that introduces it, and the try-it line says "free with no signup".
• Breadcrumbs. The guide had a BreadcrumbList; the three explainers now have one each.
• Crawl links from the home page. The app footer only linked the guide, so the explainers were two clicks deep. A line under the app's existing hidden description now links all three, with tabindex="-1" so keyboard users don't land on something invisible. Screen readers still find them in browse mode.
• Guide heading. "Using Flield" becomes "Using Flield: looping motion, tiling, and locks", matching the title's keywords.
• The 8192 cap is documented, under the guide's Sliders section. The width and height fields also snap to it on change; before, a typed 10000 rendered at 8192 but the field kept saying 10000 until a link or slot reloaded it.

Every factual claim on the four pages was checked against the code first (ranges, caps, defaults, locks, texture renames, presets, tutorial steps). All matched, so nothing else changed.

Related issue

None.

How was this tested?

• python3 .github/scripts/checks.py main passes; every JSON-LD block parses.
• In the browser on the branch: typing 10000 into width and leaving the field snaps it to 8192 with the canvas at 8192; the three crawl links are present with tabindex="-1"; the guide shows the new heading and the cap sentence; the seamless page shows the new title, both structured-data blocks, and the reworded intro and try-it lines.
• Readability stats after the change are unchanged from before: 12.7 to 15.5 words per sentence across the four pages, no semicolons in prose.

Checklist

• No new build step, package manager, framework, or CDN dependency introduced
• generator.js still has no dependency on the UI, if touched (not touched)
• Tested locally in at least one browser

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	flield	9dfaeba	Commit Preview URL Branch Preview URL	Sep 13 2026, 09:55 PM