When a user logs in from a browser with an outdated Secret Key in
IndexedDB (e.g. after server rebuild/re-enrollment), the SRP handshake
fails with 401 but the Secret Key input field was never shown — leaving
the user stuck with no way to enter their current key.
Now detects stale-key 401s and prompts for manual Secret Key entry.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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