- Add expo-localization, i18next, react-i18next (versions aligned with
Expo 54 / RN 0.81)
- src/lib/i18n/locale-resolve.ts: pure locale-resolution helpers
(system tag -> supported catalog, with en fallback), unit-tested via
node --test with no RN imports
- src/lib/i18n/config.ts: i18next init wired to expo-localization
device detection, en.json + zh-Hans.json catalogs
- Persist a locale preference (system | en | zh-Hans) in the settings
zustand store, applied immediately via i18next.changeLanguage
- Wire I18nextProvider in app/_layout.tsx
- Localize the Settings screen (~28 strings) as the reference pattern
for extracting user-facing strings, with a language picker row and
reviewed Simplified Chinese translations
Other screens (session/[id], connection/*, index, chat components)
are deferred follow-up — issue #68 stays open for that work.
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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