Password prompt for protected artifacts now matches the login screen:
viewport-centered, logo + "Artifacto" title above the form. Lock icon is
now a badge overlaid on the logo so the two visuals combine instead of
stacking. Drops the header/footer chrome since visitors here aren't
logged in and have no navigation to reach.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
dtoro
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