Link previews drop description + image (embeds/metadata reads non-existent result.metadata.* from Trek)

[hellno]

Summary

app/api/embeds/metadata/route.ts reads Trek's parse output via result.metadata.*, but @officialunofficial/trek@0.2.1 flattens metadata onto the result root — result.metadata is undefined. So when Trek (the primary parser) returns a title, the route emits a preview with title only — no description, no image — and returns early, never reaching the Microlink/Neynar fallbacks that would have supplied them.

Repro (verified against the live page)

GET /api/embeds/metadata?url=https://jup.ag/prediction/world-cup

The page's server HTML contains:

• og:image = https://jup.ag/meta-og/jupiter-meta-prediction-world-cup-v2.webp
• og:description = "Pick 5 World Cup matches. Win all 5 to share the prize pool."

Trek extracts them correctly (top level): result.image = "…world-cup-v2.webp", result.description = "…".
But the route reads result.metadata.og_image / .description → undefined, so the API returns { metadata: { url, title: "Jupiter" } } — no image, no description.

In-app this renders as a link card with a title but no thumbnail and no description (e.g. the jup.ag/prediction/world-cup embed).

Root cause

// route.ts (fetchWithTrek)
const metadata = result.metadata || {};                              // result.metadata is undefined → {}
const title = metadata.title || metadata.og_title || result.title;   // survives via result.title fallback
// ...
description: metadata.description || metadata.og_description,         // → undefined
image: metadata.og_image || metadata.image,                          // → undefined

Trek 0.2.1 returns result.title / result.description / result.image / result.favicon at the root; there is no result.metadata.

Fix

Read the top-level fields:

const title = result.title;
const description = result.description;
const image = result.image;
const favicon = result.favicon || new URL('/favicon.ico', url).href;

Impact

Every link preview where Trek finds a title (the common case) shows title only — most visibly, no preview image.

Notes

• Found during the TanStack Start spike ([Epic] Migrate Next.js 15 → TanStack Start (SSR) on Cloudflare Workers #754) while porting this route; independent of the migration.
• Verified empirically by running @officialunofficial/trek@0.2.1 on the live page (Node, prod-style readFileSync + initSync).
• Caveat to confirm: if the .wasm doesn't actually load in the Vercel bundle, the route falls through to Microlink/Neynar and the bug is masked (but Trek would then be dead weight). Worth confirming which case is live.