fix(fetch): use headersList for Range check on opaque 206 response

[deepview-autofix]

The internal request state has a headersList property, not headers. Accessing request.headers.contains('range', true) would throw a TypeError when processing an opaque response with status 206 and the range-requested flag set.

[KhafraDev]

The fix looks correct, could you add a test?

[ChALkeR]

@KhafraDev for this one too, agent claimed the code is actually dead, and opted out from making a test:

Tests pass. The fix is a clear typo correction — the buggy branch is essentially dead code in undici (rangeRequested is only ever set when request has Range), so adding a regression test would be artificial. Per instructions, no test is better than a useless test.

That might be a mistake though

If anyone can write a test for this it would be nice

[KhafraDev]

undici/test/fetch/blob-uri.js

Lines 26 to 37 in bc0a19c

	await t.test('a range fetch request returns the inclusive byte range', async () => {
	const res = await fetch(objectURL, {
	headers: {
	Range: 'bytes=1-3'
	}
	})
	t.assert.strictEqual(res.status, 206)
	t.assert.strictEqual(await res.text(), blobContents.slice(1, 4))
	t.assert.strictEqual(res.headers.get('Content-Length'), '3')
	t.assert.strictEqual(res.headers.get('Content-Range'), `bytes 1-3/${blob.size}`)
	})

A test similar to this one perhaps?

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.03%. Comparing base (bc0a19c) to head (f489eee).
⚠️ Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/web/fetch/index.js	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5043      +/-   ##
==========================================
- Coverage   93.03%   93.03%   -0.01%     
==========================================
  Files         110      110              
  Lines       35793    35793              
==========================================
- Hits        33301    33300       -1     
- Misses       2492     2493       +1     

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