Record request URL and HTTP status on failed downloads

[jonocodes]

Why

While testing the app log (#70), a failed save only recorded:

Failed to download article {"url":"https://github.com/...","error":"NetworkError when attempting to fetch resource."}

That's not enough to act on. The underlying reason is a browser security boundary: when a cross-origin response fails the CORS check (no Access-Control-Allow-Origin), the browser filters the response before JS sees it. fetch rejects with a bare TypeError, and there is no response object — so status, headers, and body are all unavailable. XMLHttpRequest, no-cors fetches, and PerformanceResourceTiming.responseStatus all report 0 for such responses. The status is only readable when the response carries CORS headers.

What

Generic failure context on downloads — no CORS-specific logic:

• fetchWithTimeout throws a FetchError carrying the resolved requestUrl (proxy included) and the HTTP status when the browser exposed one (src/utils/article/tools.ts).
• ingestUrl logs requestUrl and status on failure; image-download failures carry the same.
• When the response is CORS-filtered and no status is available, the log still names the exact request URL so it can be opened directly (or seen in devtools).

A failed save now logs:

{
  "url": "https://github.com/...",
  "error": "Network error: NetworkError when attempting to fetch resource.",
  "requestUrl": "https://lively-cors-proxy-....workers.dev/?url=..."
}

and, when the proxy returns an error with CORS headers:

{
  "url": "https://github.com/...",
  "error": "HTTP 429 Too Many Requests",
  "requestUrl": "https://lively-cors-proxy-....workers.dev/?url=...",
  "status": 429
}

Testing

• npx tsc --noEmit — clean
• npx jest — 307 passed
• npm run lint — no new warnings

Base of this PR is main; the app-log feature it builds on (#70) is already merged. CHANGELOG updated.

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