Technical SEO: breadcrumb JSON-LD, sitemap lastmod, title fixes

[styler]

Part 3 of 3 (stacked on #95 — retarget after the stack merges).

• BreadcrumbList JSON-LD on every docs page (Head override), derived from the URL path — search results get a breadcrumb trail instead of a bare URL.
• Sitemap <lastmod> from each page's last git commit date (adds @astrojs/sitemap directly; Starlight skips its own when one is present). 179/183 URLs covered.
• Homepage <title> no longer doubles the brand ("StreamElements Documentation | StreamElements Docs" → "StreamElements Documentation") via frontmatter head override.
• Duplicate titles disambiguated: "Getting Started" ×2 → "Getting Started with the Chatbot"/"…with Overlays"; websocket topic "Emote Combo Module" → "Chatbot Emote Combo" (+ "Pyramid Module" → "Chatbot Pyramid" for convention).
• Search-intent retitles: "Code Editor" → "Widget Structure & Custom Fields" (it's the FIELDS/custom-fields reference; sidebar label stays "Code Editor"), "Argument tokens" → "Command Arguments".
• "watchtime" surfaced on the $(user) page (description, keywords, time_online row) — previously no docs page contained the word people actually search.
• Over-length filters index description shortened for SERP display.

Verified in the built output: homepage title, JSON-LD renders valid, lastmod present, links validator green.

🤖 Generated with Claude Code

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	docs	36c11a2	Jul 18 2026, 12:07 PM