Show Semble descriptions on Related cards

[disnet]

Related cards in the Discussion section ("Similar on Semble") showed a title and a siteName · N saves line and nothing else, so a reader had no sense of what a recommendation was about. The description was already in the data — the proxy's similar-URLs mapping read metadata.title and metadata.siteName and dropped metadata.description, the field the sibling connections mapping already keeps.

• feed-proxy — emit description from getSimilarUrls metadata through the same text() sanitizer/2000-char cap the connections' description uses.
• backend / frontend types — widen the passthrough. The field is description?: string | null (optional, not required) because the proxy is a separate Fly app that deploys on its own schedule and caches assembled bundles ~5 minutes, so payloads predating the field keep arriving for a while in any deploy order.
• AtmospherePanel — render it under the title, guarded by {#if item.description}, clamped to two lines in the muted .connection-note register (--text-sm, --color-text-secondary). No new colors, no shadows; a card without a description looks exactly as it does today.

The plan's main open risk was whether Semble's getSimilarUrls actually returns metadata.description. Verified live against api.semble.so: it does, populated alongside title/siteName/imageUrl.

Checks: feed-proxy bun test 401 pass / 0 fail and npm run check clean; frontend 665 tests pass and npm run check 0 errors; backend 719 tests pass. Tests cover the description rendering, an explicit null, and an entry with the field absent entirely (the stale-cache/older-proxy case).

Radial artifact

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