[TheStreamCode]

Problem

pollToken (src/auth.ts:159-207) turned transport failures into terminal failures: a rejected fetch or a non-JSON body produced body = null, and the else if branch threw login failed: unreadable token response on the first network blip. A user on a flaky network or behind a proxy had the device login aborted mid-flow and had to restart with a new code.

Change

• Classify transport and parse failures separately: a rejected fetch, an unparseable body, or a body carrying neither an access token nor an OAuth error increments transportFailures and keeps polling.
• Continue polling until expires_in with the existing interval and slow_down backoff.
• Abort only on terminal OAuth errors (any string error other than authorization_pending / slow_down).
• The timeout message now reports how many network errors occurred.

Tests

• poll survives transient transport failures (fetch rejects twice, then pends, then succeeds)
• poll keeps polling after unparseable token responses
• poll still aborts on terminal OAuth errors after a transport blip
• poll reports transport failures when it times out

Verification

• npm ci
• npm run build
• npm test — 24/24 pass