refactor: Phase 4 — Update UI primitives to SUMI design system
- button.tsx: Remove gaming/terminal/nature/glass variants, add link variant,
add focus-visible glow, remove scale transforms and neon shadows
- card.tsx: Remove glass/glow/glowMagenta variants, update radius to rounded-lg,
remove hover translate transforms
- modal.tsx: Update backdrop to bg-black/60 + blur(4px), bg-popover,
SUMI easing curves and durations
- badge.tsx: Terminal variant aliased to success, doc updates
- avatar.tsx: Already migrated, doc updates
- progress.tsx: Fix gradient colors to SUMI semantics
- input.tsx: bg-background, border-border, SUMI focus glow
- textarea.tsx: Add SUMI focus glow
Co-authored-by: Cursor <cursoragent@cursor.com>
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