Replaced cramped single-column layout with a polished two-panel design:
- Left: navy (#0a1d37) brand panel with logo, headline, feature checklist,
radial glow accents, and security footer — visible at lg+ breakpoints
- Right: centered white card on slate-50 background with clean form,
proper input focus states (navy ring), and consistent navy submit button
- Mobile: collapses to single column with logo above the card
- Removed washed-out disabled orange button; button is always visible
- Consistent with admin design system (navy primary, orange accent only)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
