[recovery] fix: guard IssuesList against GitHub issues with null user

[pettinarip]

Production error

TypeError: Cannot read properties of undefined (reading 'login')
  at x (.next/server/chunks/[root-of-the-server]__0jap1v0._.js:2:7061)
  at async l (…:2:10929)
  at async s (…:2:11970)
  at async Module._ [as handler] (…:2:13040)

• Function: ___netlify-server-handler · hit_count: 1 · request_id: 01KTAFRXH3YJ525MSC7HT2VPTW
• URL: none captured

Root cause

src/components/IssuesList/index.tsx is an async server component (rendered via MDX on the public /contributing page). It reads issue.user.login/issue.user.avatar_url unguarded inside its synchronous .map() callback:

{issues.map((issue) => (
  <Avatar name={issue.user.login} href={`https://github.com/${issue.user.login}`} … />

GitHub's REST issues API returns user: null for issues authored by deleted ("ghost") accounts. The GHIssue type declares user as non-null, so there is no compile-time guard. When the cached "good first issues" list contains such an issue, the SSR render dereferences undefined.login and the whole page render throws.

The synchronous error frame x (no async) nested under the async render frames and the top-level ___netlify-server-handler matches this synchronous .map() callback rather than the webhook's async POST body (app/api/gfi-issues-webhook/route.ts), which shares the same field access but reads a webhook payload where issue.user is reliably present.

Fix

Filter out issues without a user before rendering — a one-line null check that drops only malformed (ghost-authored) entries and leaves the existing card markup untouched.

Verification

• pnpm type-check — passes
• pnpm exec eslint src/components/IssuesList/index.tsx — clean

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