login: fix lint (errcheck blank-assign, ireturn)
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- Assert the stubbed-Wait error in runBrowserLogin tests instead of blank-assigning it (errcheck check-blank).
- nolint:ireturn on StartBrowserAuth and its test fake — the BrowserAuthFlow interface return is deliberate for test substitution.
Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com Entire-Checkpoint: a0b237ab3218
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