feat: bootstrap i18next with EN/FR/ES translation files

[Copilot]

The app lacked a standard i18n layer — translations were hardcoded inline in salesCopy.ts with no i18next integration.

Changes

• src/i18n.ts — New i18next config module; French forced as default (lng: 'fr') for the pilot, English as fallback (fallbackLng: 'en'), escapeValue: false (React handles XSS)
• src/locales/{en,fr,es}/translation.json — Translation files extracted from existing salesCopy.ts and refined_locales.ts content, covering nav, hero, problem, solution, benefits, technology, trust, demo form, expansion, ethics, footer, overlay labels, and PAU guide strings
• src/main.tsx — Side-effect import of ./i18n added before app mount to initialize i18next eagerly
• package.json — Added i18next and react-i18next dependencies

// src/i18n.ts
i18n
  .use(initReactI18next)
  .init({
    resources,
    lng: 'fr',
    fallbackLng: 'en',
    interpolation: { escapeValue: false }
  });

The existing SALES_COPY / AppLocale system is left untouched; i18next runs alongside it and can be adopted incrementally by components via useTranslation.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
tryonyou-app	Ready	Preview, Comment	May 4, 2026 8:45am
tryonyou-pilot	Ready	Preview, Comment	May 4, 2026 8:45am