feat(design): Variant UI style applied - layout maintained
Based on Variant ZIO Complete Website design (screenshot1-13):
- tokens.css: color palette (#003366, #005A8C, #00A0C8), Pretendard font, 4px grid
- global.css: section-label-v, section-title-v, v-card, v-stats-section, btn-v-*
- Home.jsx: SVG icons for Business cards, Variant-style section labels, dark navy KPI section
- Common.css: page-hero improved (navy gradient), section labels cyan, sub-nav refined
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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