feat: dashboard i18n with English + Korean and metric tooltips#98

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laybacksound96 wants to merge 7 commits into

phuryn:mainfrom

laybacksound96:feature/i18n

Commits on Apr 30, 2026

feat(i18n): add translation infrastructure (no UI change)
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feat(i18n): mark static HTML with data-i18n attributes
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feat(i18n): route dynamic JS-rendered text through tr()
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feat(i18n): add language picker dropdown in header
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feat(i18n): add Korean translations and register ko locale
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test(i18n): assert MESSAGES/LOCALES are complete and consistent
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docs(i18n): document language support and contribution flow
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