Summary

Discord/Slack/etc. were showing the generic "Site Diagnostics" title and description for every share link instead of the per-diagnostic values. Root cause: the static defaults in `index.html` were duplicating with the injected dynamic tags, and crawlers pick the first occurrence.

• Strip static `<title>`, `og:`, `twitter:`, and meta description from the HTML before injecting the dynamic block in the `/d/{token}` handler
• Switch `og-image.tsx` asset loading from `node:fs` (fails on Cloudflare Workers) to `fetch()` from CDN — Inter fonts + resvg WASM — so `/og/{token}.png` works in both Bun dev and production
• Delete the now-unused bundled TTF files

Test plan

• After deploy, view source on a `/d/{token}` URL and confirm only ONE `og:title` / `og:description` exists, with the per-diagnostic values
• Paste a share URL into the Facebook OG debugger / X card validator — preview shows the diagnostic title, summary, and rendered card image
• Open `/og/{token}.png` directly — image renders within ~1–2s on first hit, instant on subsequent hits

🤖 Generated with Claude Code

Summary by cubic

Fixes duplicate SEO tags so link previews show the correct diagnostic title and description. Also makes OG image generation work on Cloudflare Workers by fetching fonts and WASM from a CDN.

• Bug Fixes
  • Strip static <title>, meta description, og:*, and twitter:* tags from index.html before injecting dynamic tags in the /d/{token} handler.
  • Replace filesystem reads in og-image.tsx with CDN fetch() for Inter fonts and @resvg/resvg-wasm WASM, compatible with Bun dev and Cloudflare Workers.
  • Remove bundled Inter TTF files no longer used.

^{Written for commit fed0c5b. Summary will update on new commits.}