Changelog

OG image color sync, duplicate label removal, and sentence period fixes

• OG image gradient updated to match share-preview card — fresh indigo tone
• OFF mode: removed duplicate page label that appeared in both badge and bottom hint
• ON mode: badge removed when content lines provide sufficient context
• Budget simulation OG meaning (en/ja/zh): added sentence-ending period

Home card descriptions unified with page subtitles

• DRY refactor: home tool cards now share sub_* i18n keys with page subtitles — removed redundant home_desc_* keys (4 languages)

General availability

• 4 languages × 4 currencies (KRW/USD/JPY/CNY)
• 14 calculators — salary, net-to-gross, severance, loan, leave, and more
• Salary simulation with 3 scenarios (steady, challenger, dream) chart