Branded Keycloak login page with CERTifAI dark theme: indigo/teal
color palette, Inter + Space Grotesk fonts, animated background
gradients, card glow, logo float, and button shimmer effects.
Overrides PatternFly v4 defaults including autofill color fix.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
