refactor: Phase 1 — SUMI token foundation
- Rewrite index.css with complete SUMI token system (dark + light themes)
- All --sumi-* variables: backgrounds, surfaces, borders, text, pigments,
spacing, radius, shadows, glass, scrollbar, motion, z-index, layout
- shadcn/Radix semantic mapping (--background, --foreground, etc.)
- Tailwind @theme mapping with new fonts (Inter, Space Grotesk, JetBrains Mono)
- SUMI keyframe animations (sumi-fade-in, sumi-slide-up, sumi-scale-in, etc.)
- Delete 11 redundant CSS files (design-system.css, design-tokens.css,
button.css, card.css, input.css, badge-avatar.css, header.css,
fix-input-focus.css, fix-login-form.css, visual-enhancements.css,
premium-utilities.css)
- Update main.tsx: single CSS import (index.css only)
- Update ThemeProvider: data-theme attribute instead of .dark class toggle
- Update index.html FOUC script: data-theme attribute
Co-authored-by: Cursor <cursoragent@cursor.com>
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