The server-generated PDF had a placeholder for the Secret Key that was
never filled in client-side, making the Emergency Kit useless. Users
who relied on it could not recover their Secret Key on new devices.
Now generates the PDF entirely client-side via browser print dialog,
with the real Secret Key embedded. No server round-trip, key never
leaves the browser.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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